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

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Date:	Mon, 25 Jan 2010 15:03:49 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Mike Galbraith <efault@....de>, 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 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.

(Had to drop the -i -I thingies, otherwise this took ages)

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