linux-kernel - Re: Phoronix CFS vs BFS bencharks

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Message-ID: <f42384a10909141214w1b3e7719j1a82363f7cb6fd3e@mail.gmail.com>
Date:	Mon, 14 Sep 2009 21:14:35 +0200
From:	Marcin Letyns <mletyns@...il.com>
To:	Mike Galbraith <efault@....de>
Cc:	Nikos Chantziaras <realnc@...or.de>, Ingo Molnar <mingo@...e.hu>,
	Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: Phoronix CFS vs BFS bencharks

2009/9/14 Mike Galbraith <efault@....de>
>
> On Mon, 2009-09-14 at 16:27 +0200, Marcin Letyns wrote:
> > Hello,
> >
> > Disabling NEW_FAIR_SLEEPERS makes a lot of difference here in the
> > Apache benchmark:
> >
> > 2.6.30.6-bfs: 7311.05
> >
> > 2.6.30.6-cfs-fair_sl_disabled: 8249.17
> >
> > 2.6.30.6-cfs-fair_sl_enabled: 4894.99
>
> Wow.
>
> Some loads like wakeup preemption (mysql+oltp), and some hate it.  This
> load appears to REALLY hate it (as does volanomark, but that thing is
> extremely overloaded).  How many threads does that benchmark run
> concurrently?

>From the benchmark description:

This is a test of ab, which is the Apache Benchmark program. This test
profile measures how many requests per second a given system can
sustain when carrying out 500,000 requests with 100 requests being
carried out concurrently.
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