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[
    {
        "id": 941,
        "web_url": "https://patches.dpdk.org/comment/941/",
        "msgid": "<20140923170231.GC12884@hmsreliant.think-freely.org>",
        "date": "2014-09-23T17:02:31",
        "subject": "Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32",
        "submitter": {
            "id": 32,
            "url": "https://patches.dpdk.org/api/people/32/?format=api",
            "name": "Neil Horman",
            "email": "nhorman@tuxdriver.com"
        },
        "content": "On Tue, Sep 23, 2014 at 12:08:15PM +0100, Bruce Richardson wrote:\n> To improve performance by using bulk alloc or vectored RX routines, we\n> need to set rx free threshold (rxfreet) value to 32, so make this the\n> testpmd default.\n> \n> Thirty-two is the minimum setting needed to enable either the\n> bulk alloc or vector RX routines inside the ixgbe driver, so it's\n> best made the default for that reason. Please see\n> \"check_rx_burst_bulk_alloc_preconditions()\" in ixgbe_rxtx.c, and\n> RX function assignment logic in \"ixgbe_dev_rx_queue_setup()\" in\n> the same file.\n> \n> The difference in IO performance for testpmd when called without any\n> optional parameters, and using 10G NICs using the ixgbe driver, can be\n> significant - approx 25% or more.\n> \n> Updates in V2:\n> * Updated commit message with additional details\n> \n> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>\n> ---\n>  app/test-pmd/testpmd.c | 4 +++-\n>  1 file changed, 3 insertions(+), 1 deletion(-)\n> \n> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c\n> index 9f6cdc4..f76406f 100644\n> --- a/app/test-pmd/testpmd.c\n> +++ b/app/test-pmd/testpmd.c\n> @@ -225,7 +225,9 @@ struct rte_eth_thresh tx_thresh = {\n>  /*\n>   * Configurable value of RX free threshold.\n>   */\n> -uint16_t rx_free_thresh = 0; /* Immediately free RX descriptors by default. */\n> +uint16_t rx_free_thresh = 32; /* Refill RX descriptors once every 32 packets,\n> +\t\tThis setting is needed for ixgbe to enable bulk alloc or vector\n> +\t\treceive functionality. */\n\nI thought we were talking about making this a pmd private selectable item, or\nallowing a reserved \"let the pmd decide\" setting.  Or are we saving that for a\nlater time?\n\nNeil\n\n>  \n>  /*\n>   * Configurable value of RX drop enable.\n> -- \n> 1.9.3\n> \n>",
        "headers": {
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            "In-Reply-To": "<1411470497-10209-4-git-send-email-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 EC04958FE\n\tfor <dev@dpdk.org>; Tue, 23 Sep 2014 18:56:31 +0200 (CEST)",
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            ],
            "References": "<1410948102-12740-1-git-send-email-bruce.richardson@intel.com>\n\t<1411470497-10209-1-git-send-email-bruce.richardson@intel.com>\n\t<1411470497-10209-4-git-send-email-bruce.richardson@intel.com>",
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            "Message-ID": "<20140923170231.GC12884@hmsreliant.think-freely.org>",
            "Delivered-To": "patchwork@dpdk.org",
            "Precedence": "list",
            "From": "Neil Horman <nhorman@tuxdriver.com>",
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            "To": "Bruce Richardson <bruce.richardson@intel.com>",
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            "List-Id": "patches and discussions about DPDK <dev.dpdk.org>",
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            "X-BeenThere": "dev@dpdk.org",
            "Date": "Tue, 23 Sep 2014 13:02:31 -0400",
            "Cc": "dev@dpdk.org",
            "X-Spam-Score": "-2.9 (--)",
            "Subject": "Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32"
        }
    },
    {
        "id": 944,
        "web_url": "https://patches.dpdk.org/comment/944/",
        "msgid": "<59AF69C657FD0841A61C55336867B5B03440521B@IRSMSX103.ger.corp.intel.com>",
        "date": "2014-09-24T09:03:20",
        "subject": "Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32",
        "submitter": {
            "id": 20,
            "url": "https://patches.dpdk.org/api/people/20/?format=api",
            "name": "Bruce Richardson",
            "email": "bruce.richardson@intel.com"
        },
        "content": "> -----Original Message-----\n> From: Neil Horman [mailto:nhorman@tuxdriver.com]\n> Sent: Tuesday, September 23, 2014 6:03 PM\n> To: Richardson, Bruce\n> Cc: dev@dpdk.org\n> Subject: Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32\n> \n> On Tue, Sep 23, 2014 at 12:08:15PM +0100, Bruce Richardson wrote:\n> > To improve performance by using bulk alloc or vectored RX routines, we\n> > need to set rx free threshold (rxfreet) value to 32, so make this the\n> > testpmd default.\n> >\n> > Thirty-two is the minimum setting needed to enable either the\n> > bulk alloc or vector RX routines inside the ixgbe driver, so it's\n> > best made the default for that reason. Please see\n> > \"check_rx_burst_bulk_alloc_preconditions()\" in ixgbe_rxtx.c, and\n> > RX function assignment logic in \"ixgbe_dev_rx_queue_setup()\" in\n> > the same file.\n> >\n> > The difference in IO performance for testpmd when called without any\n> > optional parameters, and using 10G NICs using the ixgbe driver, can be\n> > significant - approx 25% or more.\n> >\n> > Updates in V2:\n> > * Updated commit message with additional details\n> >\n> > Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>\n> > ---\n> >  app/test-pmd/testpmd.c | 4 +++-\n> >  1 file changed, 3 insertions(+), 1 deletion(-)\n> >\n> > diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c\n> > index 9f6cdc4..f76406f 100644\n> > --- a/app/test-pmd/testpmd.c\n> > +++ b/app/test-pmd/testpmd.c\n> > @@ -225,7 +225,9 @@ struct rte_eth_thresh tx_thresh = {\n> >  /*\n> >   * Configurable value of RX free threshold.\n> >   */\n> > -uint16_t rx_free_thresh = 0; /* Immediately free RX descriptors by default. */\n> > +uint16_t rx_free_thresh = 32; /* Refill RX descriptors once every 32 packets,\n> > +\t\tThis setting is needed for ixgbe to enable bulk alloc or vector\n> > +\t\treceive functionality. */\n> \n> I thought we were talking about making this a pmd private selectable item, or\n> allowing a reserved \"let the pmd decide\" setting.  Or are we saving that for a\n> later time?\n> \n\nYes, we are looking at that - and hopefully we can also get a patch for that in for our next release. However, I've left this patch in just in case that doesn't actually happen, as the performance improvements for 10G are just too good to leave aside for the sake of a 1-line change. Ideally, I'd like this go to in, and then be replaced by a \"proper\" fix.\n\n/Bruce\n\n> Neil\n> \n> >\n> >  /*\n> >   * Configurable value of RX drop enable.\n> > --\n> > 1.9.3\n> >\n> >",
        "headers": {
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            "Thread-Topic": "[dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32",
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                "from [92.243.14.124] (localhost [IPv6:::1])\n\tby dpdk.org (Postfix) with ESMTP id A43F35953;\n\tWed, 24 Sep 2014 10:58:30 +0200 (CEST)",
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            ],
            "References": "<1410948102-12740-1-git-send-email-bruce.richardson@intel.com>\n\t<1411470497-10209-1-git-send-email-bruce.richardson@intel.com>\n\t<1411470497-10209-4-git-send-email-bruce.richardson@intel.com>\n\t<20140923170231.GC12884@hmsreliant.think-freely.org>",
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            "From": "\"Richardson, Bruce\" <bruce.richardson@intel.com>",
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            "To": "Neil Horman <nhorman@tuxdriver.com>",
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            "Subject": "Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32",
            "Cc": "\"dev@dpdk.org\" <dev@dpdk.org>",
            "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
            "Date": "Wed, 24 Sep 2014 09:03:20 +0000"
        }
    },
    {
        "id": 949,
        "web_url": "https://patches.dpdk.org/comment/949/",
        "msgid": "<20140924100512.GA4446@hmsreliant.think-freely.org>",
        "date": "2014-09-24T10:05:12",
        "subject": "Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32",
        "submitter": {
            "id": 32,
            "url": "https://patches.dpdk.org/api/people/32/?format=api",
            "name": "Neil Horman",
            "email": "nhorman@tuxdriver.com"
        },
        "content": "On Wed, Sep 24, 2014 at 09:03:20AM +0000, Richardson, Bruce wrote:\n> > -----Original Message-----\n> > From: Neil Horman [mailto:nhorman@tuxdriver.com]\n> > Sent: Tuesday, September 23, 2014 6:03 PM\n> > To: Richardson, Bruce\n> > Cc: dev@dpdk.org\n> > Subject: Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32\n> > \n> > On Tue, Sep 23, 2014 at 12:08:15PM +0100, Bruce Richardson wrote:\n> > > To improve performance by using bulk alloc or vectored RX routines, we\n> > > need to set rx free threshold (rxfreet) value to 32, so make this the\n> > > testpmd default.\n> > >\n> > > Thirty-two is the minimum setting needed to enable either the\n> > > bulk alloc or vector RX routines inside the ixgbe driver, so it's\n> > > best made the default for that reason. Please see\n> > > \"check_rx_burst_bulk_alloc_preconditions()\" in ixgbe_rxtx.c, and\n> > > RX function assignment logic in \"ixgbe_dev_rx_queue_setup()\" in\n> > > the same file.\n> > >\n> > > The difference in IO performance for testpmd when called without any\n> > > optional parameters, and using 10G NICs using the ixgbe driver, can be\n> > > significant - approx 25% or more.\n> > >\n> > > Updates in V2:\n> > > * Updated commit message with additional details\n> > >\n> > > Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>\n> > > ---\n> > >  app/test-pmd/testpmd.c | 4 +++-\n> > >  1 file changed, 3 insertions(+), 1 deletion(-)\n> > >\n> > > diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c\n> > > index 9f6cdc4..f76406f 100644\n> > > --- a/app/test-pmd/testpmd.c\n> > > +++ b/app/test-pmd/testpmd.c\n> > > @@ -225,7 +225,9 @@ struct rte_eth_thresh tx_thresh = {\n> > >  /*\n> > >   * Configurable value of RX free threshold.\n> > >   */\n> > > -uint16_t rx_free_thresh = 0; /* Immediately free RX descriptors by default. */\n> > > +uint16_t rx_free_thresh = 32; /* Refill RX descriptors once every 32 packets,\n> > > +\t\tThis setting is needed for ixgbe to enable bulk alloc or vector\n> > > +\t\treceive functionality. */\n> > \n> > I thought we were talking about making this a pmd private selectable item, or\n> > allowing a reserved \"let the pmd decide\" setting.  Or are we saving that for a\n> > later time?\n> > \n> \n> Yes, we are looking at that - and hopefully we can also get a patch for that in for our next release. However, I've left this patch in just in case that doesn't actually happen, as the performance improvements for 10G are just too good to leave aside for the sake of a 1-line change. Ideally, I'd like this go to in, and then be replaced by a \"proper\" fix.\n> \nOk, thanks\nNeil\n\n> /Bruce\n> \n> > Neil\n> > \n> > >\n> > >  /*\n> > >   * Configurable value of RX drop enable.\n> > > --\n> > > 1.9.3\n> > >\n> > >\n>",
        "headers": {
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            ],
            "References": "<1410948102-12740-1-git-send-email-bruce.richardson@intel.com>\n\t<1411470497-10209-1-git-send-email-bruce.richardson@intel.com>\n\t<1411470497-10209-4-git-send-email-bruce.richardson@intel.com>\n\t<20140923170231.GC12884@hmsreliant.think-freely.org>\n\t<59AF69C657FD0841A61C55336867B5B03440521B@IRSMSX103.ger.corp.intel.com>",
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            "From": "Neil Horman <nhorman@tuxdriver.com>",
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            "To": "\"Richardson, Bruce\" <bruce.richardson@intel.com>",
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            "Date": "Wed, 24 Sep 2014 06:05:12 -0400",
            "Cc": "\"dev@dpdk.org\" <dev@dpdk.org>",
            "X-Spam-Score": "-2.9 (--)",
            "Subject": "Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32"
        }
    },
    {
        "id": 2450,
        "web_url": "https://patches.dpdk.org/comment/2450/",
        "msgid": "<2215672.o2GmOzFsZU@xps13>",
        "date": "2014-11-07T12:30:53",
        "subject": "Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32",
        "submitter": {
            "id": 1,
            "url": "https://patches.dpdk.org/api/people/1/?format=api",
            "name": "Thomas Monjalon",
            "email": "thomas.monjalon@6wind.com"
        },
        "content": "Hi Bruce,\n\n2014-09-24 09:03, Richardson, Bruce:\n> From: Neil Horman [mailto:nhorman@tuxdriver.com]\n> > On Tue, Sep 23, 2014 at 12:08:15PM +0100, Bruce Richardson wrote:\n> > > --- a/app/test-pmd/testpmd.c\n> > > +++ b/app/test-pmd/testpmd.c\n> > > @@ -225,7 +225,9 @@ struct rte_eth_thresh tx_thresh = {\n> > >  /*\n> > >   * Configurable value of RX free threshold.\n> > >   */\n> > > -uint16_t rx_free_thresh = 0; /* Immediately free RX descriptors by default. */\n> > > +uint16_t rx_free_thresh = 32; /* Refill RX descriptors once every 32 packets,\n> > > +\t\tThis setting is needed for ixgbe to enable bulk alloc or vector\n> > > +\t\treceive functionality. */\n> > \n> > I thought we were talking about making this a pmd private selectable item,\n> > or allowing a reserved \"let the pmd decide\" setting.  Or are we saving\n> > that for a later time?\n> \n> Yes, we are looking at that - and hopefully we can also get a patch for that\n> in for our next release. However, I've left this patch in just in case that\n> doesn't actually happen, as the performance improvements for 10G are just\n> too good to leave aside for the sake of a 1-line change. Ideally, I'd like\n> this go to in, and then be replaced by a \"proper\" fix.\n\nNow the patch for PMD defaults is integrated:\n\thttp://dpdk.org/ml/archives/dev/2014-October/006511.html\nAre you working on getting these defaults in testpmd?\n\nThanks",
        "headers": {
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            ],
            "References": "<1410948102-12740-1-git-send-email-bruce.richardson@intel.com>\n\t<20140923170231.GC12884@hmsreliant.think-freely.org>\n\t<59AF69C657FD0841A61C55336867B5B03440521B@IRSMSX103.ger.corp.intel.com>",
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            "Delivered-To": "patchwork@dpdk.org",
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            "From": "Thomas Monjalon <thomas.monjalon@6wind.com>",
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            "List-Post": "<mailto:dev@dpdk.org>",
            "To": "\"Richardson, Bruce\" <bruce.richardson@intel.com>",
            "Precedence": "list",
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            "Cc": "dev@dpdk.org",
            "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
            "Subject": "Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32"
        }
    },
    {
        "id": 2455,
        "web_url": "https://patches.dpdk.org/comment/2455/",
        "msgid": "<20141107134929.GA12092@bricha3-MOBL3>",
        "date": "2014-11-07T13:49:30",
        "subject": "Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32",
        "submitter": {
            "id": 20,
            "url": "https://patches.dpdk.org/api/people/20/?format=api",
            "name": "Bruce Richardson",
            "email": "bruce.richardson@intel.com"
        },
        "content": "On Fri, Nov 07, 2014 at 01:30:53PM +0100, Thomas Monjalon wrote:\n> Hi Bruce,\n> \n> 2014-09-24 09:03, Richardson, Bruce:\n> > From: Neil Horman [mailto:nhorman@tuxdriver.com]\n> > > On Tue, Sep 23, 2014 at 12:08:15PM +0100, Bruce Richardson wrote:\n> > > > --- a/app/test-pmd/testpmd.c\n> > > > +++ b/app/test-pmd/testpmd.c\n> > > > @@ -225,7 +225,9 @@ struct rte_eth_thresh tx_thresh = {\n> > > >  /*\n> > > >   * Configurable value of RX free threshold.\n> > > >   */\n> > > > -uint16_t rx_free_thresh = 0; /* Immediately free RX descriptors by default. */\n> > > > +uint16_t rx_free_thresh = 32; /* Refill RX descriptors once every 32 packets,\n> > > > +\t\tThis setting is needed for ixgbe to enable bulk alloc or vector\n> > > > +\t\treceive functionality. */\n> > > \n> > > I thought we were talking about making this a pmd private selectable item,\n> > > or allowing a reserved \"let the pmd decide\" setting.  Or are we saving\n> > > that for a later time?\n> > \n> > Yes, we are looking at that - and hopefully we can also get a patch for that\n> > in for our next release. However, I've left this patch in just in case that\n> > doesn't actually happen, as the performance improvements for 10G are just\n> > too good to leave aside for the sake of a 1-line change. Ideally, I'd like\n> > this go to in, and then be replaced by a \"proper\" fix.\n> \n> Now the patch for PMD defaults is integrated:\n> \thttp://dpdk.org/ml/archives/dev/2014-October/006511.html\n> Are you working on getting these defaults in testpmd?\n> \n\nNot at the minute, as I'm busy on other things. If I find time I can look at it,\nthough, if nobody else volunteers to do so first.\n\n/Bruce\n\n\n> Thanks\n> -- \n> Thomas",
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            "References": "<1410948102-12740-1-git-send-email-bruce.richardson@intel.com>\n\t<20140923170231.GC12884@hmsreliant.think-freely.org>\n\t<59AF69C657FD0841A61C55336867B5B03440521B@IRSMSX103.ger.corp.intel.com>\n\t<2215672.o2GmOzFsZU@xps13>",
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            "Delivered-To": "patchwork@dpdk.org",
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            "From": "Bruce Richardson <bruce.richardson@intel.com>",
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            "To": "Thomas Monjalon <thomas.monjalon@6wind.com>",
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            "Date": "Fri, 7 Nov 2014 13:49:30 +0000",
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            "List-Archive": "<http://dpdk.org/ml/archives/dev/>",
            "Subject": "Re: [dpdk-dev] [PATCH v2 3/5] testpmd: Change rxfreet default to 32"
        }
    }
]