From: Rick Jones <rick.jones2@hp.com>
To: Lennert Buytenhek <buytenh@wantstofly.org>
Cc: netdev@vger.kernel.org, Ashish Karkare <akarkare@marvell.com>,
Nicolas Pitre <nico@cam.org>
Subject: Re: using software TSO on non-TSO capable netdevices
Date: Thu, 31 Jul 2008 10:00:32 -0700 [thread overview]
Message-ID: <4891EFB0.4040003@hp.com> (raw)
In-Reply-To: <20080730235004.GC21999@xi.wantstofly.org>
Lennert Buytenhek wrote:
> When using sendfile() to send a GiB worth of zeroes over a single TCP
> connection to another host on a 100 Mb/s network, with a vanilla
> 2.6.27-rc1 kernel, this runs as expected at wire speed, taking the
> following amount of CPU time per test:
>
> sys 0m5.410s
> sys 0m5.380s
> sys 0m5.620s
> sys 0m5.360s
That's output from "time" run against your test program right? Are
folks confident that will account for all the CPU time consumed on
behalf of that program? FWIW netperf is unwilling to make such an
assumption. Perhaps I and it are being too paranoid but there you have
it :)
rick jones
fwiw, there is a TCP_SENDFILE test in netperf
next prev parent reply other threads:[~2008-07-31 17:00 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-30 23:50 using software TSO on non-TSO capable netdevices Lennert Buytenhek
2008-07-30 23:56 ` David Miller
2008-07-31 0:41 ` Lennert Buytenhek
2008-07-31 1:10 ` David Miller
2008-07-31 1:45 ` Lennert Buytenhek
2008-07-31 3:54 ` Herbert Xu
2008-07-31 9:45 ` Lennert Buytenhek
2008-07-31 10:55 ` Herbert Xu
2008-07-31 12:37 ` Lennert Buytenhek
2008-07-31 12:59 ` Herbert Xu
2008-08-03 8:23 ` David Miller
2008-07-31 7:34 ` Ilpo Järvinen
2008-07-31 9:50 ` Lennert Buytenhek
2008-07-31 10:27 ` Ilpo Järvinen
2008-07-31 2:29 ` Herbert Xu
2008-07-31 2:36 ` Lennert Buytenhek
2008-07-31 3:03 ` Herbert Xu
2008-07-31 6:55 ` Ilpo Järvinen
2008-07-31 9:39 ` Lennert Buytenhek
2008-07-31 10:14 ` Lennert Buytenhek
2008-07-31 10:16 ` David Miller
2008-07-31 12:25 ` Lennert Buytenhek
2008-07-31 12:35 ` David Miller
2008-07-31 13:19 ` Ben Hutchings
2008-07-31 13:27 ` Herbert Xu
2008-08-03 8:19 ` David Miller
2008-08-03 8:55 ` Herbert Xu
2008-08-07 6:07 ` David Miller
2008-08-07 6:15 ` Herbert Xu
2008-09-12 4:08 ` David Miller
2008-08-07 11:50 ` Lennert Buytenhek
2008-08-07 20:32 ` Rick Jones
2008-08-07 22:44 ` David Miller
2008-07-31 17:00 ` Rick Jones [this message]
2008-07-31 17:45 ` Lennert Buytenhek
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