linux-kernel - Re: call for more SD versus CFS comparisons (was: Re: [ck] Mainline plans)

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Date:	Tue, 12 Jun 2007 10:36:20 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tobias Gerschner <tobias.gerschner@...il.com>
Cc:	Miguel Figueiredo <elmig@...ianpt.org>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	ck@....kolivas.org
Subject: Re: call for more SD versus CFS comparisons (was: Re: [ck]
	Mainline plans)


* Tobias Gerschner <tobias.gerschner@...il.com> wrote:

> I did run massive_intr.c for 60 secs with increasing nproc ( 
> 10,20,30,40,50,60) waiting for effects.
> 
> Below a small table of the results
> 
> 2.6.21.1-cfs-v16
> 
> nproc ,  usability result
> 
> 10 , serious frame drops , Firefox  hardly recognizes clicked links,
> but still usable
> 20 - 30, usability loss ( somehow under cfs firefox never finished 
> user requests like displaying web pages or opening new pages , no 
> feedback anymore, sudden changes on the desktop )

ouch! The expected load-testing result under CFS should be something 
like this:

   http://bhhdoa.org.au/pipermail/ck/2007-June/007817.html

could you send me the output of /proc/sched_debug? (while say a 
"massive_intr 20" is running?)

Roughly what hardware do you have? (could you send me your lspci -v 
output and dmesg output?)

	Ingo
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