netdev - Re: tcp bw in 2.6

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Message-ID: <20071002105423.5d61a727@freepuppy.rosehill>
Date:	Tue, 2 Oct 2007 10:54:23 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	lm@...mover.com (Larry McVoy)
Cc:	Ben Greear <greearb@...delatech.com>, lm@...mover.com,
	Herbert Xu <herbert@...dor.apana.org.au>,
	torvalds@...ux-foundation.org, davem@...emloft.net,
	wscott@...mover.com, netdev@...r.kernel.org
Subject: Re: tcp bw in 2.6

On Tue, 2 Oct 2007 10:21:55 -0700
lm@...mover.com (Larry McVoy) wrote:

> > I'm currently on 2.6.20, and have also tried 10gbe nics on 2.6.23 with
> 
> My guess is that it is a bug in the debian 2.6.18 kernel.
> 
> > Have you tried something like ttcp, iperf, or even regular ftp?
> 
> Yeah, I've factored out the code since BitKeeper, my test program,
> and John's test program all exhibit the same behaviour.  Also switched
> switches.
> 
> > Checked your nics to make sure they have no errors and are negotiated
> > to full duplex?
> 
> Yup and yup.

Make sure you don't have slab debugging turned on. It kills performance.

-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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