linux-kernel - Re: Netperf UDP_STREAM regression due to not sending IPIs in ttwu

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Date:	Tue, 02 Oct 2012 11:31:22 +0200
From:	Mike Galbraith <efault@....de>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Netperf UDP_STREAM regression due to not sending IPIs in
 ttwu_queue()

On Tue, 2012-10-02 at 09:45 +0100, Mel Gorman wrote: 
> On Tue, Oct 02, 2012 at 09:49:36AM +0200, Mike Galbraith wrote:

> > Hm, 518cd623 fixed up the troubles I saw.  How exactly are you running
> > this?
> > 
> 
> You saw problems with TCP_RR where as this is UDP_STREAM.

Yeah, but I wanted to stare at UDP_STREAM as you run it to see if it
would tell me anything about why those numbers happen.

> I'm running this through MMTests with a version of the
> configs/config-global-dhp__network-performance file that only runs
> netperf-udp. Ultimately it runs netperf for a size something like
> this
> 
> SIZE=64
> taskset -c 0 netserver
> taskset -c 1 netperf -t UDP_STREAM -i 50,6 -I 99,1 -l 20 -H 127.0.0.1 -- -P 15895 -s 32768 -S 32768 -m $SIZE -M $SIZE

Thanks.

-Mike


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