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List:       netbsd-tech-net
Subject:    Re: [patch] ixg(4): Intel 82599 10-gigabit ethernet
From:       David Laight <david () l8s ! co ! uk>
Date:       2011-08-15 19:04:22
Message-ID: 20110815190422.GQ19482 () snowdrop ! l8s ! co ! uk
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On Tue, Aug 09, 2011 at 06:58:26PM -0500, David Young wrote:
> 
> If I don't bind iperf(1) to one CPU, then lock contention on my 2-CPU
> test boxes gobbles up a lot of time and TCP transmission performance
> plummets.  Our network stack doesn't do SMP well. :-/

Lock contention or massive amounts of cache-snooping (etc) because
the process keeps on being scheduled on the 'other' cpu.

	David

-- 
David Laight: david@l8s.co.uk
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