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

Mike Galbraith
2009-11-05T08:57:23Z

On Thu, 2009-11-05 at 08:03 +0100, Mike Galbraith wrote:
> 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

Ingo, ignore my "eek!" reaction (for now).

I'm trying to test the pull lineup with as many benchmarks as I can fit
in, but methinks I'm screwing this one (unfamiliar) up :-/

> 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