linux-kernel - Re: [patch] Re: scheduler oddity [bug?]

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Date:	Mon, 09 Mar 2009 15:41:51 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Mike Galbraith <efault@....de>
Cc:	Ingo Molnar <mingo@...e.hu>, Balazs Scheidler <bazsi@...abit.hu>,
	linux-kernel@...r.kernel.org, Willy Tarreau <w@....eu>
Subject: Re: [patch] Re: scheduler oddity [bug?]

On Mon, 2009-03-09 at 15:11 +0100, Mike Galbraith wrote:

> > Yes 2* worked fine.  Mysql+oltp was my worry spot, being a very affinity
> > sensitive little <bleep>, but my patchlet didn't cause any trouble, so
> > this one shouldn't either.  I'll do some re-test in any case, and squeak
> > should anything turn up.
> 
> Squeak!  Didn't even get to mysql+oltp.
> 
> marge:..local/tmp # netperf -t UDP_STREAM -l 60 -H 127.0.0.1  -- -P 15888,12384 -s 32768 -S 32768 -m 4096
> UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 15888 AF_INET to 127.0.0.1 (127.0.0.1) port 12384 AF_INET
> Socket  Message  Elapsed      Messages
> Size    Size     Time         Okay Errors   Throughput
> bytes   bytes    secs            #      #   10^6bits/sec
> 
>  65536    4096   60.00     5161103      0    2818.65
>  65536           60.00     5149666           2812.40
> 
>  6188 root      20   0  1040  544  324 R  100  0.0   0:31.49 0 netperf
>  6189 root      20   0  1044  260  164 R   48  0.0   0:15.35 3 netserver
> 
> Hurt, pain, ouch, vs...
> 
> marge:..local/tmp # netperf -t UDP_STREAM -l 60 -H 127.0.0.1 -T 0,0 -- -P 15888,12384 -s 32768 -S 32768 -m 4096
> UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 15888 AF_INET to 127.0.0.1 (127.0.0.1) port 12384 AF_INET : cpu bind
> Socket  Message  Elapsed      Messages
> Size    Size     Time         Okay Errors   Throughput
> bytes   bytes    secs            #      #   10^6bits/sec
> 
>  65536    4096   60.00     8452028      0    4615.93
>  65536           60.00     8442945           4610.97
> 
> Drat.

Bugger, so back to the drawing board it is...

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