Date: Sat, 24 Oct 2015 01:32:56 -0700 From: Jack Vogel <jfvogel@gmail.com> To: "Eggert, Lars" <lars@netapp.com> Cc: Eric Joyner <erj@freebsd.org>, Bruce Evans <brde@optusnet.com.au>, Ian Smith <smithi@nimnet.asn.au>, Kevin Oberman <rkoberman@gmail.com>, "net@freebsd.org" <net@freebsd.org>, "jfv@FreeBSD.org" <jfv@freebsd.org>, Luigi Rizzo <rizzo@iet.unipi.it>, Giuseppe Lettieri <g.lettieri@iet.unipi.it> Subject: Re: ixl 40G bad performance? Message-ID: <CAFOYbcmJzyg%2BGLXgan75mgQECFJd6wyKUcOU_zn8WRi78p5L1g@mail.gmail.com> In-Reply-To: <0CFE1957-8FEB-4000-9E39-1F6A8983EFA6@netapp.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> <CAN6yY1uZJ5MhMdXLGy7REk8i6Z%2BjgJwMXFSu899%2BQwVaz%2BvP4w@mail.gmail.com> <20151020190541.B15983@sola.nimnet.asn.au> <6CD6754D-FC0E-4B24-AAEC-7C9D68284141@netapp.com> <20151020232218.G1833@besplex.bde.org> <20151023162337.L1149@besplex.bde.org> <CA%2Bb0zg92iMfLfRo%2BZBiMBnpBS_WBG==h3a3NCSXQGyeD7gio8A@mail.gmail.com> <0CFE1957-8FEB-4000-9E39-1F6A8983EFA6@netapp.com>
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13 on a 40G interface?? I don't think that's very good for Linux either, is this a 4x10 adapter? Maybe elaborating on the details of the hardware, you sure you don't have a bad PCI slot somewhere that might be throttling everything? Cheers, Jack On Sat, Oct 24, 2015 at 12:43 AM, Eggert, Lars <lars@netapp.com> wrote: > On 2015-10-23, at 23:36, Eric Joyner <erj@freebsd.org> wrote: > > I see that the sysctl does clobber the global value, but have you tried > lowering the interval / raising the rate? You could try something like > 10usecs, and see if that helps. We'll do some more investigation here -- > 3Gb/s on a 40Gb/s using default settings is terrible, and we shouldn't let > that be happening. > > > I played with different settings, but I've never been able to get more > than 4Gb/s, whereas under Linux 4.2 without any special settings I get 13. > > See my other email on TSO/LRO not looking to be effective; that would > certainly explain it. Plausible? Anything to try here? > > Lars > >
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