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

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Date:	Sat, 19 Sep 2009 22:22:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Felix Fietkau <nbd@...nwrt.org>
Cc:	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>
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements


* Felix Fietkau <nbd@...nwrt.org> wrote:

> Ingo Molnar wrote:
> > * Felix Fietkau <nbd@...nwrt.org> wrote:
> >> I did some tests with BFS v230 vs CFS on Linux 2.6.30 on a different
> >> MIPS device (Atheros AR2317) with 180 MHz and 16 MB RAM. When running
> >> iperf tests, I consistently get the following results when running the
> >> transfer from the device to my laptop:
> >> 
> >> CFS: [  5]  0.0-60.0 sec    107 MBytes  15.0 Mbits/sec
> >> BFS: [  5]  0.0-60.0 sec    119 MBytes  16.6 Mbits/sec
> >> 
> >> The transfer speed from my laptop to the device are the same with BFS
> >> and CFS. I repeated the tests a few times just to be sure, and I will
> >> check vmstat later.
> > 
> > Which exact mainline kernel have you tried? For anything performance 
> > related running latest upstream -git (currently at 202c467) would be 
> > recommended.
>
> I used the OpenWrt-patched 2.6.30. Support for the hardware that I 
> tested with hasn't been merged upstream yet. Do you think that the 
> scheduler related changes after 2.6.30 are relevant for non-SMP 
> performance as well? If so, I'll work on a test with latest upstream 
> -git with the necessary patches when I have time for it.

Dont know - it's hard to tell what happens without basic analysis tools. 
Is there _any_ way to profile what happens on that system? (Do hrtimers 
work on it that could be used to profile it?)

	Ingo
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