linux-kernel - Re: UDP-U stream performance regression on 32-rc1 kernel

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Date:	Thu, 05 Nov 2009 08:03:18 +0100
From:	Mike Galbraith <efault@....de>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...e.hu>, alex.shi@...el.com,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: UDP-U stream performance regression on 32-rc1 kernel

On Thu, 2009-11-05 at 06:20 +0100, Mike Galbraith wrote:
> On Thu, 2009-11-05 at 10:20 +0800, Zhang, Yanmin wrote:
> > On Wed, 2009-11-04 at 13:07 +0100, Mike Galbraith wrote:
> 
> > > Can you try the below, and send me 
> > I tested it on Nehalem machine against the latest tips kernel. netperf loopback
> > result is good and regression disappears.
> 
> Excellent.  Ingo has picked up a version in tip (1b9508f) which has zero
> negative effect on my x264 testcase, and is a win for mysql+oltp through
> the whole test spectrum.  As that may (dunno, Ingo?) now be considered a
> regression fix, ie candidate for 32.final, testing that it does no harm
> to your big machines would be a good thing.  (pretty please?:)

Egad. Size XXL difference on my cheap Q6600 box

git v2.6.32-rc6-26-g91d3f9b
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

 65536    4096   60.00     7793073      0    4256.06
 65536           60.00     7780487           4249.18

git v2.6.32-rc6-26-g91d3f9b + 1b9508f
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

 65536    4096   60.00     15133547      0    8264.93
 65536           60.00     15131466           8263.80

tip v2.6.32-rc6-1796-gd995f1d
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

 65536    4096   60.00     13998562      0    7645.08
 65536           60.00     13986112           7638.28 (uhoh, tinker time.)

	-Mike

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