Date: Wed, 11 Jan 2017 16:54:43 -0800 From: Matthew Macy <mmacy@nextbsd.org> To: =?UTF-8?Q?=22Olivier_Cochard-Labb=C3=A9=22?= <olivier@freebsd.org> Cc: "Sean Bruno" <sbruno@freebsd.org>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Re: HEADS-UP: IFLIB implementations of sys/dev/e1000 em, lem, igb pending Message-ID: <159902b73ed.10775291e21533.7488368455500235608@nextbsd.org> In-Reply-To: <CA%2Bq%2BTcp5LwrnXt75tNpYpAr1KWx9YpLx5kMHhPR%2BYgAs__n1eA@mail.gmail.com> References: <30f21c75-d3a2-edcd-1999-d5ed9f970c06@freebsd.org> <b000a957-8d17-a04d-6275-0d3920aa8a17@freebsd.org> <CA%2Bq%2BTcramTrYgYT-s%2B=aBZzRJV8FmKQqGt=1twPhLBR7AoXkcQ@mail.gmail.com> <1598d97bf2a.c6bcb76838987.6501340920645175463@nextbsd.org> <574a7ac7-4842-9518-8286-a4d89a9f7a27@freebsd.org> <CA%2Bq%2BTco-dcoU8EZnDEzgoK-v2Q2=U5GF6ASMSj0kwzd_wB5xig@mail.gmail.com> <6c6cb534-73c7-464b-8af1-7445a9c0188c@freebsd.org> <1598f29d379.ea6360351471.8752933472741761813@nextbsd.org> <CA%2Bq%2BTcpUXXPEQtdMFup6EZzyCKs9Ep%2BnS5SB%2Bfm6bSJSDs34_w@mail.gmail.com> <1598f3f8588.d20017893749.339651164872952258@nextbsd.org> <1598f42ad77.eeec05be4113.9201780237587761460@nextbsd.org> <CA%2Bq%2BTcp5LwrnXt75tNpYpAr1KWx9YpLx5kMHhPR%2BYgAs__n1eA@mail.gmail.com>
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> A flame graph for the core cycle count and a flame graph with cache mis= s stats from pmc would be a great start. > =20 >=20 > =E2=80=8BI didn't know the exact event name to use for cache miss stats,= but here are the flame graphs for CPU_CLK_UNHALTED_CORE: > http://dev.bsdrp.net/netgate.r311848.CPU_CLK_UNHALTED_CORE.svg > http://dev.bsdrp.net/netgate.r311849.CPU_CLK_UNHALTED_CORE.svg Thanks. Having twice as many txqs would definitely help. It's also clear th= at there may be some sort of peformance issue in iflib_txq_drain. Although = it could just be non-stop cache misses on the packet headers. -M
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