netdev - Re: Network latency regressions from 2.6.22 to 2.6.29

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Message-ID: <alpine.DEB.1.10.0904161553160.23632@qirst.com>
Date:	Thu, 16 Apr 2009 15:55:02 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	netdev@...r.kernel.org
Subject: Re: Network latency regressions from 2.6.22 to 2.6.29

On Thu, 16 Apr 2009, Eric Dumazet wrote:

> Is it a bnx2 or tg3 driver ?

bnx2.

> It would be sane to always set on both machines :
> ethtool -C eth0 rx-usecs 0 rx-frames 1
> prior to your tests...

rx-usecs is set to 18 by default by the driver and rx-frames is set to 6.
We saw some funky behavior with rx-usecs 0 so we left the defaults.

But what does it matter? Just changing the kernel should not cause
increases in latency.

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