linux-kernel - Re: BFS vs. mainline scheduler benchmarks and measurements

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Message-ID: <4AA6123F.7020704@arcor.de>
Date:	Tue, 08 Sep 2009 11:13:51 +0300
From:	Nikos Chantziaras <realnc@...or.de>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Pekka Pietikainen <pp@...oulu.fi>, Michael Buesch <mb@...sch.de>,
	Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>, Felix Fietkau <nbd@...nwrt.org>
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

On 09/08/2009 11:04 AM, Ingo Molnar wrote:
>
> * Pekka Pietikainen<pp@...oulu.fi>  wrote:
>
>> On Mon, Sep 07, 2009 at 10:57:01PM +0200, Ingo Molnar wrote:
>>>>> Could you profile it please? Also, what's the context-switch rate?
>>>>
>>>> As far as I can tell, the broadcom mips architecture does not have
>>>> profiling support. It does only have some proprietary profiling
>>>> registers that nobody wrote kernel support for, yet.
>>> Well, what does 'vmstat 1' show - how many context switches are
>>> there per second on the iperf server? In theory if it's a truly
>>> saturated box, there shouldnt be many - just a single iperf task
>>
>> Yay, finally something that's measurable in this thread \o/
>
> My initial posting in this thread contains 6 separate types of
> measurements, rather extensive ones. Out of those, 4 measurements
> were latency oriented, two were throughput oriented. Plenty of data,
> plenty of results, and very good reproducability.

None of which involve latency-prone GUI applications running on cheap 
commodity hardware though.  I listed examples where mainline seems to 
behave sub-optimal and ways to reproduce them but this doesn't seem to 
be an area of interest.
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