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

Mike Galbraith
2009-11-05T07:03:23Z

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