linux-kernel - Re: netperf ~50% regression with 2.6.33-rc1, bisect to 1b9508f

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Message-Id: <1264429179.5881.9.camel@marge.simson.net>
Date:	Mon, 25 Jan 2010 15:19:39 +0100
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Lin Ming <ming.m.lin@...el.com>, Ingo Molnar <mingo@...e.hu>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: netperf ~50% regression with 2.6.33-rc1, bisect to 1b9508f

On Mon, 2010-01-25 at 15:03 +0100, Peter Zijlstra wrote:
> On Mon, 2010-01-25 at 18:03 +0800, Lin Ming wrote:
> > Hi, 
> > 
> > The netperf lookback regression comes back again.
> > UDP stream test has ~50% regression with 2.6.33-rc1 compared to 2.6.32.
> > 
> > Testing machine: Nehalem, 2 sockets, 4 cores, hyper thread, 4G mem
> > Server and client are bind to different physical cpu. 
> > 
> > taskset -c 15 ./netserver
> > taskset -c 0 ./netperf -t UDP_STREAM -l 60 -H 127.0.0.1 -i 50,3 -I 99,5
> > -- -P 12384,12888 -s 32768 -S 32768 -m 1024
> 
> I cannot reproduce this on a dual socket nehalem system, I get current
> -linus to be about 10% faster than .32.

Nogo here too, but no nice HW here.

	-Mike

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