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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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