netdev - Re: using software TSO on non-TSO capable netdevices

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Message-ID: <20080731174546.GD31160@xi.wantstofly.org>
Date:	Thu, 31 Jul 2008 19:45:46 +0200
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	Rick Jones <rick.jones2@...com>
Cc:	netdev@...r.kernel.org, Ashish Karkare <akarkare@...vell.com>,
	Nicolas Pitre <nico@....org>
Subject: Re: using software TSO on non-TSO capable netdevices

On Thu, Jul 31, 2008 at 10:00:32AM -0700, Rick Jones 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?

No, but I wasn't drawing absolute conclusions, just comparing runs
without GSO with runs with GSO.  :-)
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