Date: Sat, 24 Oct 2015 07:43:06 +0000 From: "Eggert, Lars" <lars@netapp.com> To: Eric Joyner <erj@freebsd.org> Cc: 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: <0CFE1957-8FEB-4000-9E39-1F6A8983EFA6@netapp.com> In-Reply-To: <CA%2Bb0zg92iMfLfRo%2BZBiMBnpBS_WBG==h3a3NCSXQGyeD7gio8A@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> <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>
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--Apple-Mail=_C4A5AFE6-0FFD-49DB-AF8D-B08A2F3CBC4F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii 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 --Apple-Mail=_C4A5AFE6-0FFD-49DB-AF8D-B08A2F3CBC4F Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- iQCVAwUBVis2jNZcnpRveo1xAQg0ZAP+I2aX0iZnfKUtEzndV/LNYZThZ87CtQNM /VY+BWiV5ciCyKqbISlcSOCznkDN+i9oEIdKa59CdfGI/WjVWYFp3zd5AuwxLFKx 1hQlapfG91vraC1D3y8dCmiaI0LKXs+8BzKfzm0AQw1yHthUtsu7/wS7SLH312yl 8RYXPRLK2gY= =RruI -----END PGP SIGNATURE----- --Apple-Mail=_C4A5AFE6-0FFD-49DB-AF8D-B08A2F3CBC4F--
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