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[
    {
        "id": 115404,
        "web_url": "https://patches.dpdk.org/comment/115404/",
        "msgid": "<448ae078-47d7-0287-7fc9-63d8d026664f@intel.com>",
        "date": "2020-07-07T17:47:21",
        "subject": "Re: [dpdk-dev] [PATCH v3 1/3] app/testpmd: clock gettime call in\n throughput calculation",
        "submitter": {
            "id": 324,
            "url": "https://patches.dpdk.org/api/people/324/",
            "name": "Ferruh Yigit",
            "email": "ferruh.yigit@intel.com"
        },
        "content": "On 7/7/2020 12:32 AM, Honnappa Nagarahalli wrote:\n> The throughput calculation requires a counter that measures\n> passing of time. However, the kernel saves and restores the PMU\n> state when a thread is unscheduled and scheduled. This ensures\n> that the PMU cycles are not counted towards a thread that is\n> not scheduled. Hence, when RTE_ARM_EAL_RDTSC_USE_PMU is enabled,\n> the PMU cycles do not represent the passing of time.\n> This results in incorrect calculation of throughput numbers.\n> Use clock_gettime system call to calculate the time passed since\n> last call.\n> \n> Bugzilla ID: 450\n> Fixes: 0e106980301d (\"app/testpmd: show throughput in port stats\")\n> Cc: zhihong.wang@intel.com\n> Cc: stable@dpdk.org\n> \n> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>\n> Reviewed-by: Phil Yang <phil.yang@arm.com>\n> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>\n> Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>\n> Tested-by: Phil Yang <phil.yang@arm.com>\n> Tested-by: Ali Alnubani <alialnu@mellanox.com>\n\nSeries applied to dpdk-next-net/master, thanks.",
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            ],
            "To": "Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>, dev@dpdk.org,\n alialnu@mellanox.com, orgerlitz@mellanox.com, wenzhuo.lu@intel.com,\n beilei.xing@intel.com, bernard.iremonger@intel.com",
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            "Message-ID": "<448ae078-47d7-0287-7fc9-63d8d026664f@intel.com>",
            "Subject": "Re: [dpdk-dev] [PATCH v3 1/3] app/testpmd: clock gettime call in\n throughput calculation",
            "X-BeenThere": "dev@dpdk.org",
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            "In-Reply-To": "<20200706233231.25881-1-honnappa.nagarahalli@arm.com>",
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            "Cc": "hemant.agrawal@nxp.com, jerinj@marvell.com, viacheslavo@mellanox.com,\n thomas@monjalon.net, ruifeng.wang@arm.com, phil.yang@arm.com, nd@arm.com,\n zhihong.wang@intel.com, stable@dpdk.org",
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            "From": "Ferruh Yigit <ferruh.yigit@intel.com>",
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            "References": "<20200617144307.9961-1-honnappa.nagarahalli@arm.com>\n <20200706233231.25881-1-honnappa.nagarahalli@arm.com>",
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            "Date": "Tue, 7 Jul 2020 18:47:21 +0100",
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    }
]