Date: Mon, 19 Oct 2015 21:47:36 -0700 From: Kevin Oberman <rkoberman@gmail.com> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: "Eggert, Lars" <lars@netapp.com>, "jfv@FreeBSD.org" <jfv@freebsd.org>, "ricera10@gmail.com" <ricera10@gmail.com>, Giuseppe Lettieri <g.lettieri@iet.unipi.it>, "net@freebsd.org" <net@freebsd.org> Subject: Re: ixl 40G bad performance? Message-ID: <CAN6yY1uZJ5MhMdXLGy7REk8i6Z%2BjgJwMXFSu899%2BQwVaz%2BvP4w@mail.gmail.com> In-Reply-To: <CA%2BhQ2%2BiGk5Bx5mZ8v7K9cPdiNcJgBz99kmP8=twFnETw-bi2vw@mail.gmail.com> References: <79830D9D-94E6-47A9-92B9-D63DF5432272@netapp.com> <CA%2BhQ2%2Bj5PkmRWe-ydahExfvOj%2BzestFEn%2B5DZ9_acG2Z_v=8_w@mail.gmail.com> <C81B629B-67D5-4E5B-A215-452E837BE673@netapp.com> <CA%2BhQ2%2BiGk5Bx5mZ8v7K9cPdiNcJgBz99kmP8=twFnETw-bi2vw@mail.gmail.com>
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On Mon, Oct 19, 2015 at 8:11 AM, Luigi Rizzo <rizzo@iet.unipi.it> wrote: > On Monday, October 19, 2015, Eggert, Lars <lars@netapp.com> wrote: > > > Hi, > > > > On 2015-10-19, at 16:20, Luigi Rizzo <rizzo@iet.unipi.it <javascript:;>> > > wrote: > > > > > > i would look at the following: > > > - c states and clock speed - make sure you never go below C1, > > > and fix the clock speed to max. > > > Sure these parameters also affect the 10G card, but there > > > may be strange interaction that trigger the power saving > > > modes in different ways > > > > I already have powerd_flags="-a max -b max -n max" in rc.conf, which I > > hope should be enough. > > > I suspect it might not touch the c states, but better check. The safest is > disable them in the bios. > To disable C-States: sysctl dev.cpu.0.cx_lowest=C1 -- Kevin Oberman, Part time kid herder and retired Network Engineer
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