Date: Thu, 22 Oct 2015 08:21:19 +0000 From: "Eggert, Lars" <lars@netapp.com> To: hiren panchasara <hiren@strugglingcoder.info> Cc: "erj@FreeBSD.org" <erj@FreeBSD.org>, "net@freebsd.org" <net@freebsd.org> Subject: Re: ixl 40G bad performance? Message-ID: <25588FF3-E5A7-47A7-990C-72740F30B654@netapp.com> In-Reply-To: <A65BFAC4-E2C1-466B-A46B-D38E9A95B073@netapp.com> References: <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> <12938D48-44B9-456A-AD7C-630D7E09BB35@netapp.com> <CAFOYbcnY0DjCYE4vP_o7uU2KP0dHJZe7wWu8TCQ5XPMA0eohfg@mail.gmail.com> <99F14384-271F-4543-A7F8-E19F4006998A@netapp.com> <20151021161935.GF28288@strugglingcoder.info> <A65BFAC4-E2C1-466B-A46B-D38E9A95B073@netapp.com>
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--Apple-Mail=_B7DB74BD-B267-4025-B452-665EDBF0AEAE Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On 2015-10-22, at 9:38, Eggert, Lars <lars@netapp.com> wrote: > for those of you following along, I did try jumbograms and throughput = increases roughly 5x. So it looks like I'm hitting a packet-rate limit = somewhere. Does the ixl driver have an issue with TSO/LRO? If I tcpdump on the receiver when testing the 10G ix interfaces, I see = that most "packets" are up to 64KB in the traces on both sender and = receiver, which is expected with TSO/LRO. When I look at the traffic over the ixl interfaces, I see that most = "packets" on the sender are much smaller (~2896 aka 2 segments; although = some few are >40K). On the receiver, I only see 1448 byte packets. Lars --Apple-Mail=_B7DB74BD-B267-4025-B452-665EDBF0AEAE 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----- iQCUAwUBViicftZcnpRveo1xAQhJTgP4jHc0k76zbXDySTBQCB4ABoDKD60Pxsaf zlMzTxdu7it9oZhj1TQA2Qew7Xi6NtU6TJgo11nRcaztioXTQ0MMT8UNI5V5fbkQ bOBv1HFQNPiqA8tgnVUO+ZWSTbUNUXzyvYYmfhxQJbfL5QnaWPSGuphZj94yVoTU 1gdcj7/irg== =MpJK -----END PGP SIGNATURE----- --Apple-Mail=_B7DB74BD-B267-4025-B452-665EDBF0AEAE--
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