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[
    {
        "id": 208,
        "web_url": "https://patches.dpdk.org/comment/208/",
        "msgid": "<1409471.9EROF7RsSj@xps13>",
        "date": "2014-07-23T08:33:03",
        "subject": "Re: [dpdk-dev] [PATCH] Added Spinlock to l3fwd-vf example to\n\tprevent race conditioning",
        "submitter": {
            "id": 1,
            "url": "https://patches.dpdk.org/api/people/1/",
            "name": "Thomas Monjalon",
            "email": "thomas.monjalon@6wind.com"
        },
        "content": "Hi Daniel,\n\nSome explanations are missing here.\n\n> Signed-off-by: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>\n> \n> --- a/examples/l3fwd-vf/main.c\n> +++ b/examples/l3fwd-vf/main.c\n> @@ -54,6 +54,7 @@\n>  #include <rte_per_lcore.h>\n>  #include <rte_launch.h>\n>  #include <rte_atomic.h>\n> +#include <rte_spinlock.h>\n>  #include <rte_cycles.h>\n>  #include <rte_prefetch.h>\n>  #include <rte_lcore.h>\n> @@ -328,7 +329,7 @@ struct lcore_conf {\n>  } __rte_cache_aligned;\n>  \n>  static struct lcore_conf lcore_conf[RTE_MAX_LCORE];\n> -\n> +static rte_spinlock_t spinlock_conf[RTE_MAX_ETHPORTS]={RTE_SPINLOCK_INITIALIZER};\n>  /* Send burst of packets on an output interface */\n>  static inline int\n>  send_burst(struct lcore_conf *qconf, uint16_t n, uint8_t port)\n> @@ -340,7 +341,10 @@ send_burst(struct lcore_conf *qconf, uint16_t n, uint8_t port)\n>  \tqueueid = qconf->tx_queue_id;\n>  \tm_table = (struct rte_mbuf **)qconf->tx_mbufs[port].m_table;\n>  \n> +\trte_spinlock_lock(&spinlock_conf[port]) ;\n>  \tret = rte_eth_tx_burst(port, queueid, m_table, n);\n> +\trte_spinlock_unlock(&spinlock_conf[port]);\n> +\t\n>  \tif (unlikely(ret < n)) {\n>  \t\tdo {\n>  \t\t\trte_pktmbuf_free(m_table[ret]);\n>",
        "headers": {
            "List-Subscribe": "<http://dpdk.org/ml/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>",
            "Cc": "dev@dpdk.org",
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            "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
            "Date": "Wed, 23 Jul 2014 10:33:03 +0200",
            "Precedence": "list",
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            "References": "<1404818184-29388-1-git-send-email-danielx.t.mrzyglod@intel.com>",
            "In-Reply-To": "<1404818184-29388-1-git-send-email-danielx.t.mrzyglod@intel.com>",
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            "To": "Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>",
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                "from mail-wg0-f49.google.com (mail-wg0-f49.google.com\n\t[74.125.82.49]) by dpdk.org (Postfix) with ESMTP id BED3E6896\n\tfor <dev@dpdk.org>; Wed, 23 Jul 2014 10:31:48 +0200 (CEST)",
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                "from xps13.localnet (136-92-190-109.dsl.ovh.fr. [109.190.92.136])\n\tby mx.google.com with ESMTPSA id\n\tgi15sm4230099wjc.20.2014.07.23.01.33.09 for <multiple recipients>\n\t(version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);\n\tWed, 23 Jul 2014 01:33:10 -0700 (PDT)"
            ],
            "From": "Thomas Monjalon <thomas.monjalon@6wind.com>",
            "Message-ID": "<1409471.9EROF7RsSj@xps13>",
            "List-Post": "<mailto:dev@dpdk.org>",
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            "Subject": "Re: [dpdk-dev] [PATCH] Added Spinlock to l3fwd-vf example to\n\tprevent race conditioning",
            "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
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    },
    {
        "id": 2567,
        "web_url": "https://patches.dpdk.org/comment/2567/",
        "msgid": "<1800110.lhpGsJ8ic2@xps13>",
        "date": "2014-11-11T22:56:30",
        "subject": "Re: [dpdk-dev] [PATCH] Added Spinlock to l3fwd-vf example to\n\tprevent race conditioning",
        "submitter": {
            "id": 1,
            "url": "https://patches.dpdk.org/api/people/1/",
            "name": "Thomas Monjalon",
            "email": "thomas.monjalon@6wind.com"
        },
        "content": "Hi Daniel,\n\nThis old patch is probably good but I'd like you explain it please.\nReviewers are also welcome.\n\nThanks",
        "headers": {
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            "Cc": "dev@dpdk.org",
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            "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
            "Date": "Tue, 11 Nov 2014 23:56:30 +0100",
            "Message-ID": "<1800110.lhpGsJ8ic2@xps13>",
            "X-BeenThere": "dev@dpdk.org",
            "References": "<1404818184-29388-1-git-send-email-danielx.t.mrzyglod@intel.com>\n\t<1409471.9EROF7RsSj@xps13>",
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            "To": "Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>",
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            ],
            "From": "Thomas Monjalon <thomas.monjalon@6wind.com>",
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            "Subject": "Re: [dpdk-dev] [PATCH] Added Spinlock to l3fwd-vf example to\n\tprevent race conditioning",
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    },
    {
        "id": 2569,
        "web_url": "https://patches.dpdk.org/comment/2569/",
        "msgid": "<C37D651A908B024F974696C65296B57B0F2F1AEB@SHSMSX101.ccr.corp.intel.com>",
        "date": "2014-11-11T23:18:15",
        "subject": "Re: [dpdk-dev] [PATCH] Added Spinlock to l3fwd-vf example\n\tto\tprevent race conditioning",
        "submitter": {
            "id": 16,
            "url": "https://patches.dpdk.org/api/people/16/",
            "name": "Huawei Xie",
            "email": "huawei.xie@intel.com"
        },
        "content": "> -----Original Message-----\n> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Thomas Monjalon\n> Sent: Tuesday, November 11, 2014 3:57 PM\n> To: Mrzyglod, DanielX T\n> Cc: dev@dpdk.org\n> Subject: Re: [dpdk-dev] [PATCH] Added Spinlock to l3fwd-vf example to prevent\n> race conditioning\n> \n> Hi Daniel,\n> \n> This old patch is probably good but I'd like you explain it please.\n> Reviewers are also welcome.\n> \n> Thanks\n> --\n> Thomas\n> \n> 2014-07-23 10:33, Thomas Monjalon:\n> > Hi Daniel,\n> >\n> > Some explanations are missing here.\n> >\n> > > Signed-off-by: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>\n> > >\n> > > --- a/examples/l3fwd-vf/main.c\n> > > +++ b/examples/l3fwd-vf/main.c\n> > > @@ -54,6 +54,7 @@\n> > >  #include <rte_per_lcore.h>\n> > >  #include <rte_launch.h>\n> > >  #include <rte_atomic.h>\n> > > +#include <rte_spinlock.h>\n> > >  #include <rte_cycles.h>\n> > >  #include <rte_prefetch.h>\n> > >  #include <rte_lcore.h>\n> > > @@ -328,7 +329,7 @@ struct lcore_conf {\n> > >  } __rte_cache_aligned;\n> > >\n> > >  static struct lcore_conf lcore_conf[RTE_MAX_LCORE];\n> > > -\n> > > +static rte_spinlock_t\n> spinlock_conf[RTE_MAX_ETHPORTS]={RTE_SPINLOCK_INITIALIZER};\n> > >  /* Send burst of packets on an output interface */\n> > >  static inline int\n> > >  send_burst(struct lcore_conf *qconf, uint16_t n, uint8_t port)\n> > > @@ -340,7 +341,10 @@ send_burst(struct lcore_conf *qconf, uint16_t n,\n> uint8_t port)\n> > >  \tqueueid = qconf->tx_queue_id;\n> > >  \tm_table = (struct rte_mbuf **)qconf->tx_mbufs[port].m_table;\n> > >\n> > > +\trte_spinlock_lock(&spinlock_conf[port]) ;\n> > >  \tret = rte_eth_tx_burst(port, queueid, m_table, n);\n> > > +\trte_spinlock_unlock(&spinlock_conf[port]);\n\nIt might not be good choice for here, but how about we also provide spin_trylock as alternative API?\n\n> > > +\n> > >  \tif (unlikely(ret < n)) {\n> > >  \t\tdo {\n> > >  \t\t\trte_pktmbuf_free(m_table[ret]);\n> > >",
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            "Date": "Tue, 11 Nov 2014 23:18:15 +0000",
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                "from [92.243.14.124] (localhost [IPv6:::1])\n\tby dpdk.org (Postfix) with ESMTP id 429437F6D;\n\tWed, 12 Nov 2014 00:08:32 +0100 (CET)",
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            ],
            "From": "\"Xie, Huawei\" <huawei.xie@intel.com>",
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            "Subject": "Re: [dpdk-dev] [PATCH] Added Spinlock to l3fwd-vf example\n\tto\tprevent race conditioning",
            "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
            "To": "Thomas Monjalon <thomas.monjalon@6wind.com>, \"Mrzyglod, DanielX T\"\n\t<danielx.t.mrzyglod@intel.com>",
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            "Thread-Topic": "[dpdk-dev] [PATCH] Added Spinlock to l3fwd-vf example to\n\tprevent race conditioning",
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        }
    },
    {
        "id": 3799,
        "web_url": "https://patches.dpdk.org/comment/3799/",
        "msgid": "<20141208144545.GD3237@localhost.localdomain>",
        "date": "2014-12-08T14:45:45",
        "subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
        "submitter": {
            "id": 32,
            "url": "https://patches.dpdk.org/api/people/32/",
            "name": "Neil Horman",
            "email": "nhorman@tuxdriver.com"
        },
        "content": "On Tue, Jul 08, 2014 at 12:16:24PM +0100, Daniel Mrzyglod wrote:\n> Signed-off-by: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>\n> \n> ---\n> examples/l3fwd-vf/main.c |    6 +++++-\n>  1 file changed, 5 insertions(+), 1 deletion(-)\n> \n> diff --git a/examples/l3fwd-vf/main.c b/examples/l3fwd-vf/main.c\n> index 2ca5c21..57852d0 100644\n> --- a/examples/l3fwd-vf/main.c\n> +++ b/examples/l3fwd-vf/main.c\n> @@ -54,6 +54,7 @@\n>  #include <rte_per_lcore.h>\n>  #include <rte_launch.h>\n>  #include <rte_atomic.h>\n> +#include <rte_spinlock.h>\n>  #include <rte_cycles.h>\n>  #include <rte_prefetch.h>\n>  #include <rte_lcore.h>\n> @@ -328,7 +329,7 @@ struct lcore_conf {\n>  } __rte_cache_aligned;\n>  \n>  static struct lcore_conf lcore_conf[RTE_MAX_LCORE];\n> -\n> +static rte_spinlock_t spinlock_conf[RTE_MAX_ETHPORTS]={RTE_SPINLOCK_INITIALIZER};\n>  /* Send burst of packets on an output interface */\n>  static inline int\n>  send_burst(struct lcore_conf *qconf, uint16_t n, uint8_t port)\n> @@ -340,7 +341,10 @@ send_burst(struct lcore_conf *qconf, uint16_t n, uint8_t port)\n>  \tqueueid = qconf->tx_queue_id;\n>  \tm_table = (struct rte_mbuf **)qconf->tx_mbufs[port].m_table;\n>  \n> +\trte_spinlock_lock(&spinlock_conf[port]) ;\n>  \tret = rte_eth_tx_burst(port, queueid, m_table, n);\n> +\trte_spinlock_unlock(&spinlock_conf[port]);\n> +\t\n>  \tif (unlikely(ret < n)) {\n>  \t\tdo {\n>  \t\t\trte_pktmbuf_free(m_table[ret]);\n\nAcked-by: Neil Horman <nhorman@tuxdriver.com>\n\nThough, that said, doesn't it seem to anyone else like serialization of enqueue\nto a port should be the responsibility of the library, not the application?\n\nNeil",
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            "Date": "Mon, 8 Dec 2014 09:45:45 -0500",
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            "To": "Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>",
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                "from rrcs-70-62-112-196.midsouth.biz.rr.com ([70.62.112.196]\n\thelo=localhost)\n\tby smtp.tuxdriver.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.63)\n\t(envelope-from <nhorman@tuxdriver.com>)\n\tid 1XxzZQ-0000t4-FH; Mon, 08 Dec 2014 09:46:00 -0500"
            ],
            "From": "Neil Horman <nhorman@tuxdriver.com>",
            "Message-ID": "<20141208144545.GD3237@localhost.localdomain>",
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            "Subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
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        }
    },
    {
        "id": 3943,
        "web_url": "https://patches.dpdk.org/comment/3943/",
        "msgid": "<F6F2A6264E145F47A18AB6DF8E87425D12B6C944@IRSMSX106.ger.corp.intel.com>",
        "date": "2014-12-10T08:18:36",
        "subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
        "submitter": {
            "id": 58,
            "url": "https://patches.dpdk.org/api/people/58/",
            "name": "Wodkowski, PawelX",
            "email": "pawelx.wodkowski@intel.com"
        },
        "content": "> Though, that said, doesn't it seem to anyone else like serialization of enqueue\n> to a port should be the responsibility of the library, not the application?\n> \n> Neil\n\nFrom my knowledge it is an application  responsibility to serialize access to\nqueue on particular port.\n\nPawel",
        "headers": {
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            "Date": "Wed, 10 Dec 2014 08:18:36 +0000",
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            ],
            "From": "\"Wodkowski, PawelX\" <pawelx.wodkowski@intel.com>",
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            "Subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
            "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
            "To": "Neil Horman <nhorman@tuxdriver.com>, \"Mrzyglod, DanielX T\"\n\t<danielx.t.mrzyglod@intel.com>",
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            "Thread-Topic": "[dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
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        }
    },
    {
        "id": 3957,
        "web_url": "https://patches.dpdk.org/comment/3957/",
        "msgid": "<88638638.zyQcmssdg6@xps13>",
        "date": "2014-12-10T10:53:46",
        "subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
        "submitter": {
            "id": 1,
            "url": "https://patches.dpdk.org/api/people/1/",
            "name": "Thomas Monjalon",
            "email": "thomas.monjalon@6wind.com"
        },
        "content": "2014-12-08 09:45, Neil Horman:\n> On Tue, Jul 08, 2014 at 12:16:24PM +0100, Daniel Mrzyglod wrote:\n> > Signed-off-by: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>\n> Acked-by: Neil Horman <nhorman@tuxdriver.com>\n\nSomeone to provide an explanation for commit log?\n\nThanks",
        "headers": {
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            "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
            "Date": "Wed, 10 Dec 2014 02:53:46 -0800 (PST)",
            "Message-ID": "<88638638.zyQcmssdg6@xps13>",
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            "References": "<1404818184-29388-1-git-send-email-danielx.t.mrzyglod@intel.com>\n\t<20141208144545.GD3237@localhost.localdomain>",
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            "X-Google-Original-Date": "Wed, 10 Dec 2014 11:51 +0100",
            "To": "Neil Horman <nhorman@tuxdriver.com>,\n\tDaniel Mrzyglod <danielx.t.mrzyglod@intel.com>",
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                "from mail-wi0-f174.google.com (mail-wi0-f174.google.com\n\t[209.85.212.174]) by dpdk.org (Postfix) with ESMTP id A13B2282\n\tfor <dev@dpdk.org>; Wed, 10 Dec 2014 11:53:47 +0100 (CET)",
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            ],
            "From": "Thomas Monjalon <thomas.monjalon@6wind.com>",
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    },
    {
        "id": 3975,
        "web_url": "https://patches.dpdk.org/comment/3975/",
        "msgid": "<20141210144745.GC17040@localhost.localdomain>",
        "date": "2014-12-10T14:47:45",
        "subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
        "submitter": {
            "id": 32,
            "url": "https://patches.dpdk.org/api/people/32/",
            "name": "Neil Horman",
            "email": "nhorman@tuxdriver.com"
        },
        "content": "On Wed, Dec 10, 2014 at 08:18:36AM +0000, Wodkowski, PawelX wrote:\n> > Though, that said, doesn't it seem to anyone else like serialization of enqueue\n> > to a port should be the responsibility of the library, not the application?\n> > \n> > Neil\n> \n> From my knowledge it is an application  responsibility to serialize access to\n> queue on particular port.\n> \nI understand thats the way it currently is, I'm advocating for the fact that it\nshould not be.\nNeil\n\n> Pawel\n>",
        "headers": {
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            "Date": "Wed, 10 Dec 2014 09:47:45 -0500",
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            "References": "<1404818184-29388-1-git-send-email-danielx.t.mrzyglod@intel.com>\n\t<20141208144545.GD3237@localhost.localdomain>\n\t<F6F2A6264E145F47A18AB6DF8E87425D12B6C944@IRSMSX106.ger.corp.intel.com>",
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            "To": "\"Wodkowski, PawelX\" <pawelx.wodkowski@intel.com>",
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                "from smtp.tuxdriver.com (charlotte.tuxdriver.com [70.61.120.58])\n\tby dpdk.org (Postfix) with ESMTP id D84FF6A8B\n\tfor <dev@dpdk.org>; Wed, 10 Dec 2014 15:48:27 +0100 (CET)",
                "from nat-pool-rdu-t.redhat.com ([66.187.233.202] helo=localhost)\n\tby smtp.tuxdriver.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.63)\n\t(envelope-from <nhorman@tuxdriver.com>)\n\tid 1XyiYe-00027b-4f; Wed, 10 Dec 2014 09:48:11 -0500"
            ],
            "From": "Neil Horman <nhorman@tuxdriver.com>",
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            "Subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
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        }
    },
    {
        "id": 3976,
        "web_url": "https://patches.dpdk.org/comment/3976/",
        "msgid": "<20141210145455.GC1632@bricha3-MOBL3>",
        "date": "2014-12-10T14:54:56",
        "subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
        "submitter": {
            "id": 20,
            "url": "https://patches.dpdk.org/api/people/20/",
            "name": "Bruce Richardson",
            "email": "bruce.richardson@intel.com"
        },
        "content": "On Wed, Dec 10, 2014 at 09:47:45AM -0500, Neil Horman wrote:\n> On Wed, Dec 10, 2014 at 08:18:36AM +0000, Wodkowski, PawelX wrote:\n> > > Though, that said, doesn't it seem to anyone else like serialization of enqueue\n> > > to a port should be the responsibility of the library, not the application?\n> > > \n> > > Neil\n> > \n> > From my knowledge it is an application  responsibility to serialize access to\n> > queue on particular port.\n> > \n> I understand thats the way it currently is, I'm advocating for the fact that it\n> should not be.\n> Neil\n>\nIt could be done, but I think we'd need to add a new API (or new parameter to\nexisting API) to do so, as the cost of adding the locks would be severe, even in\nthe uncontented case. \nThis is why it hasn't been done up till now, obviously enough. In general, where\nwe don't provide performant multi-thread safe APIs, we generally don't try and\nprovide versions with locks, we just document the limitation and then leave it \nup to the app to determine how best to handle things.\n\n/Bruce",
        "headers": {
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            "X-Original-To": "patchwork@dpdk.org",
            "Date": "Wed, 10 Dec 2014 14:54:56 +0000",
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            "References": "<1404818184-29388-1-git-send-email-danielx.t.mrzyglod@intel.com>\n\t<20141208144545.GD3237@localhost.localdomain>\n\t<F6F2A6264E145F47A18AB6DF8E87425D12B6C944@IRSMSX106.ger.corp.intel.com>\n\t<20141210144745.GC17040@localhost.localdomain>",
            "Content-Disposition": "inline",
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            "To": "Neil Horman <nhorman@tuxdriver.com>",
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                "from [92.243.14.124] (localhost [IPv6:::1])\n\tby dpdk.org (Postfix) with ESMTP id B1EC26A95;\n\tWed, 10 Dec 2014 15:55:01 +0100 (CET)",
                "from mga03.intel.com (mga03.intel.com [134.134.136.65])\n\tby dpdk.org (Postfix) with ESMTP id F30686A8B\n\tfor <dev@dpdk.org>; Wed, 10 Dec 2014 15:54:59 +0100 (CET)",
                "from orsmga003.jf.intel.com ([10.7.209.27])\n\tby orsmga103.jf.intel.com with ESMTP; 10 Dec 2014 06:53:01 -0800",
                "from bricha3-mobl3.ger.corp.intel.com ([10.243.20.31])\n\tby orsmga003.jf.intel.com with SMTP; 10 Dec 2014 06:51:10 -0800",
                "by  (sSMTP sendmail emulation); Wed, 10 Dec 2014 14:54:56 +0025"
            ],
            "From": "Bruce Richardson <bruce.richardson@intel.com>",
            "Precedence": "list",
            "Organization": "Intel Shannon Ltd.",
            "Sender": "\"dev\" <dev-bounces@dpdk.org>",
            "List-Id": "patches and discussions about DPDK <dev.dpdk.org>",
            "Subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
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        }
    },
    {
        "id": 3978,
        "web_url": "https://patches.dpdk.org/comment/3978/",
        "msgid": "<7ADD74816B4C8A45B56203CBA65FE5A6097CABC3@IRSMSX107.ger.corp.intel.com>",
        "date": "2014-12-10T15:53:52",
        "subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
        "submitter": {
            "id": 23,
            "url": "https://patches.dpdk.org/api/people/23/",
            "name": "Daniel Mrzyglod",
            "email": "danielx.t.mrzyglod@intel.com"
        },
        "content": "> -----Original Message-----\n> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Bruce Richardson\n> Sent: Wednesday, December 10, 2014 3:55 PM\n> To: Neil Horman\n> Cc: dev@dpdk.org\n> Subject: Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n> conditioning\n> \n> On Wed, Dec 10, 2014 at 09:47:45AM -0500, Neil Horman wrote:\n> > On Wed, Dec 10, 2014 at 08:18:36AM +0000, Wodkowski, PawelX wrote:\n> > > > Though, that said, doesn't it seem to anyone else like serialization of\n> enqueue\n> > > > to a port should be the responsibility of the library, not the application?\n> > > >\n> > > > Neil\n> > >\n> > > From my knowledge it is an application  responsibility to serialize access to\n> > > queue on particular port.\n> > >\n> > I understand thats the way it currently is, I'm advocating for the fact that it\n> > should not be.\n> > Neil\n> >\n> It could be done, but I think we'd need to add a new API (or new parameter to\n> existing API) to do so, as the cost of adding the locks would be severe, even in\n> the uncontented case.\n> This is why it hasn't been done up till now, obviously enough. In general, where\n> we don't provide performant multi-thread safe APIs, we generally don't try and\n> provide versions with locks, we just document the limitation and then leave it\n> up to the app to determine how best to handle things.\n> \n> /Bruce\n\n\nthe problem is when the routing is through the same queue the app crashed. \nexample: traffic to 1.1.1.1 from port 0 and 1.1.1.1 from port 1.\nYou all are right :)\nSo the only solution are spinlocks, or we must modify \nintel-dpdk-sample-applications-user-guide.pdf to inform users about limitations.",
        "headers": {
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            "Date": "Wed, 10 Dec 2014 15:53:52 +0000",
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            "In-Reply-To": "<20141210145455.GC1632@bricha3-MOBL3>",
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            ],
            "From": "\"Mrzyglod, DanielX T\" <danielx.t.mrzyglod@intel.com>",
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            "Content-Transfer-Encoding": "quoted-printable",
            "Subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
            "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
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            "Thread-Topic": "[dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
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        }
    },
    {
        "id": 3979,
        "web_url": "https://patches.dpdk.org/comment/3979/",
        "msgid": "<20141210161646.GE17040@localhost.localdomain>",
        "date": "2014-12-10T16:16:46",
        "subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
        "submitter": {
            "id": 32,
            "url": "https://patches.dpdk.org/api/people/32/",
            "name": "Neil Horman",
            "email": "nhorman@tuxdriver.com"
        },
        "content": "On Wed, Dec 10, 2014 at 02:54:56PM +0000, Bruce Richardson wrote:\n> On Wed, Dec 10, 2014 at 09:47:45AM -0500, Neil Horman wrote:\n> > On Wed, Dec 10, 2014 at 08:18:36AM +0000, Wodkowski, PawelX wrote:\n> > > > Though, that said, doesn't it seem to anyone else like serialization of enqueue\n> > > > to a port should be the responsibility of the library, not the application?\n> > > > \n> > > > Neil\n> > > \n> > > From my knowledge it is an application  responsibility to serialize access to\n> > > queue on particular port.\n> > > \n> > I understand thats the way it currently is, I'm advocating for the fact that it\n> > should not be.\n> > Neil\n> >\n> It could be done, but I think we'd need to add a new API (or new parameter to\n> existing API) to do so, as the cost of adding the locks would be severe, even in\n> the uncontented case. \n> This is why it hasn't been done up till now, obviously enough. In general, where\n> we don't provide performant multi-thread safe APIs, we generally don't try and\n> provide versions with locks, we just document the limitation and then leave it \n> up to the app to determine how best to handle things.\n> \nThis really seems like a false savings to me.  If an application intends to use\nmultiple processes (which by all rights it seems like the use case that the dpdk\nis mostly designed for) then you need locking one way or another, and you've\njust made application coding harder, because the application now needs to know\nwhich functions might have internal critical sections that they need to provide\nlocking for.\n\nI agree that, in the single process case, there might be a slight performance\nloss (though I contend it wouldn't be greatly significant).  That said, I would\nargue that the right approach is to do the locking internally to the DPDK, then\nprovide a configuration point which toggles the spinlock defintions to either do\nproper locking, or just reduce to empty definitions, the same way the Linux and\nBSD kernels do in the uniprocessor case.  That way applications never have to\nworry about internal locking, and you can still build for the optimal case when\nyou need to.\n\nNeil\n\n> /Bruce\n>",
        "headers": {
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            "Date": "Wed, 10 Dec 2014 11:16:46 -0500",
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            "To": "Bruce Richardson <bruce.richardson@intel.com>",
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                "from smtp.tuxdriver.com (charlotte.tuxdriver.com [70.61.120.58])\n\tby dpdk.org (Postfix) with ESMTP id 7A02BDE0\n\tfor <dev@dpdk.org>; Wed, 10 Dec 2014 17:17:27 +0100 (CET)",
                "from nat-pool-rdu-t.redhat.com ([66.187.233.202] helo=localhost)\n\tby smtp.tuxdriver.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.63)\n\t(envelope-from <nhorman@tuxdriver.com>)\n\tid 1Xyjwk-0004jK-1v; Wed, 10 Dec 2014 11:17:10 -0500"
            ],
            "From": "Neil Horman <nhorman@tuxdriver.com>",
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            "Subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
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    },
    {
        "id": 4001,
        "web_url": "https://patches.dpdk.org/comment/4001/",
        "msgid": "<20141210153837.1f30eed8@urahara>",
        "date": "2014-12-10T23:38:37",
        "subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
        "submitter": {
            "id": 27,
            "url": "https://patches.dpdk.org/api/people/27/",
            "name": "Stephen Hemminger",
            "email": "stephen@networkplumber.org"
        },
        "content": "On Wed, 10 Dec 2014 11:16:46 -0500\nNeil Horman <nhorman@tuxdriver.com> wrote:\n\n> This really seems like a false savings to me.  If an application intends to use\n> multiple processes (which by all rights it seems like the use case that the dpdk\n> is mostly designed for) then you need locking one way or another, and you've\n> just made application coding harder, because the application now needs to know\n> which functions might have internal critical sections that they need to provide\n> locking for.\n\nThe DPDK is not Linux.\nSee the examples of how to route without using locks by doing asymmetric multiprocessing.\nI.e queues are only serviced by one CPU.\n\nThe cost of a locked operation (even uncontended) is often enough to drop\npacket performance by several million PPS.",
        "headers": {
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            "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
            "Date": "Wed, 10 Dec 2014 15:38:37 -0800",
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            "References": "<1404818184-29388-1-git-send-email-danielx.t.mrzyglod@intel.com>\n\t<20141208144545.GD3237@localhost.localdomain>\n\t<F6F2A6264E145F47A18AB6DF8E87425D12B6C944@IRSMSX106.ger.corp.intel.com>\n\t<20141210144745.GC17040@localhost.localdomain>\n\t<20141210145455.GC1632@bricha3-MOBL3>\n\t<20141210161646.GE17040@localhost.localdomain>",
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            "To": "Neil Horman <nhorman@tuxdriver.com>",
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            "Received": [
                "from [92.243.14.124] (localhost [IPv6:::1])\n\tby dpdk.org (Postfix) with ESMTP id E7EEA6A95;\n\tThu, 11 Dec 2014 00:38:50 +0100 (CET)",
                "from mail-pd0-f169.google.com (mail-pd0-f169.google.com\n\t[209.85.192.169]) by dpdk.org (Postfix) with ESMTP id 279BC6A87\n\tfor <dev@dpdk.org>; Thu, 11 Dec 2014 00:38:48 +0100 (CET)",
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                "from urahara (static-50-53-82-155.bvtn.or.frontiernet.net.\n\t[50.53.82.155]) by mx.google.com with ESMTPSA id\n\tri3sm5194727pdb.58.2014.12.10.15.38.44 for <multiple recipients>\n\t(version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);\n\tWed, 10 Dec 2014 15:38:46 -0800 (PST)"
            ],
            "From": "Stephen Hemminger <stephen@networkplumber.org>",
            "Message-ID": "<20141210153837.1f30eed8@urahara>",
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            "Subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
            "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
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        }
    },
    {
        "id": 4004,
        "web_url": "https://patches.dpdk.org/comment/4004/",
        "msgid": "<20141211003416.GB24240@localhost.localdomain>",
        "date": "2014-12-11T00:34:16",
        "subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
        "submitter": {
            "id": 32,
            "url": "https://patches.dpdk.org/api/people/32/",
            "name": "Neil Horman",
            "email": "nhorman@tuxdriver.com"
        },
        "content": "On Wed, Dec 10, 2014 at 03:38:37PM -0800, Stephen Hemminger wrote:\n> On Wed, 10 Dec 2014 11:16:46 -0500\n> Neil Horman <nhorman@tuxdriver.com> wrote:\n> \n> > This really seems like a false savings to me.  If an application intends to use\n> > multiple processes (which by all rights it seems like the use case that the dpdk\n> > is mostly designed for) then you need locking one way or another, and you've\n> > just made application coding harder, because the application now needs to know\n> > which functions might have internal critical sections that they need to provide\n> > locking for.\n> \n> The DPDK is not Linux.\nI never indicated that it was.\n\n> See the examples of how to route without using locks by doing asymmetric multiprocessing.\n> I.e queues are only serviced by one CPU.\n> \nYes, I've seen it.\n\n> The cost of a locked operation (even uncontended) is often enough to drop\n> packet performance by several million PPS.\nPlease re-read my note, I clearly stated that a single process use case was a\nvalid one, but that didn't preclude the need to provide mutual exclusion\ninternally to the api.  Theres no reason that this locking can't be moved into\nthe api, and the spinlock api itself either be defined to do locking at compile\ntime, or defined out as empty macros based on a build variable\n(CONFIG_SINGLE_ACCESSOR or some such).  That way you save the application the\nheadache of having to guess which api calls need locking around them, and you\nstill get maximal performance if the application being written can guarantee\nsingle accessor status to the dpdk library.\n\nNeil",
        "headers": {
            "List-Subscribe": "<http://dpdk.org/ml/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>",
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            "Date": "Wed, 10 Dec 2014 19:34:16 -0500",
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            "In-Reply-To": "<20141210153837.1f30eed8@urahara>",
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            "References": "<1404818184-29388-1-git-send-email-danielx.t.mrzyglod@intel.com>\n\t<20141208144545.GD3237@localhost.localdomain>\n\t<F6F2A6264E145F47A18AB6DF8E87425D12B6C944@IRSMSX106.ger.corp.intel.com>\n\t<20141210144745.GC17040@localhost.localdomain>\n\t<20141210145455.GC1632@bricha3-MOBL3>\n\t<20141210161646.GE17040@localhost.localdomain>\n\t<20141210153837.1f30eed8@urahara>",
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            "To": "Stephen Hemminger <stephen@networkplumber.org>",
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                "from [92.243.14.124] (localhost [IPv6:::1])\n\tby dpdk.org (Postfix) with ESMTP id E955C7E79;\n\tThu, 11 Dec 2014 01:36:57 +0100 (CET)",
                "from smtp.tuxdriver.com (charlotte.tuxdriver.com [70.61.120.58])\n\tby dpdk.org (Postfix) with ESMTP id 53B376A87\n\tfor <dev@dpdk.org>; Thu, 11 Dec 2014 01:36:48 +0100 (CET)",
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            ],
            "From": "Neil Horman <nhorman@tuxdriver.com>",
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            "Subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
            "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
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        }
    },
    {
        "id": 4017,
        "web_url": "https://patches.dpdk.org/comment/4017/",
        "msgid": "<1444843.bUb3XjPkOK@xps13>",
        "date": "2014-12-11T01:08:57",
        "subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
        "submitter": {
            "id": 1,
            "url": "https://patches.dpdk.org/api/people/1/",
            "name": "Thomas Monjalon",
            "email": "thomas.monjalon@6wind.com"
        },
        "content": "> > Signed-off-by: Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>\n> \n> Acked-by: Neil Horman <nhorman@tuxdriver.com>\n\nApplied\n\nThanks",
        "headers": {
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            "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
            "Date": "Thu, 11 Dec 2014 02:08:57 +0100",
            "Message-ID": "<1444843.bUb3XjPkOK@xps13>",
            "X-BeenThere": "dev@dpdk.org",
            "References": "<1404818184-29388-1-git-send-email-danielx.t.mrzyglod@intel.com>\n\t<20141208144545.GD3237@localhost.localdomain>",
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            "To": "Daniel Mrzyglod <danielx.t.mrzyglod@intel.com>",
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                "from mail-wi0-f174.google.com (mail-wi0-f174.google.com\n\t[209.85.212.174]) by dpdk.org (Postfix) with ESMTP id B0616804A\n\tfor <dev@dpdk.org>; Thu, 11 Dec 2014 02:09:35 +0100 (CET)",
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            ],
            "From": "Thomas Monjalon <thomas.monjalon@6wind.com>",
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            "Subject": "Re: [dpdk-dev] Added Spinlock to l3fwd-vf example to prevent race\n\tconditioning",
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