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Message-ID: <466F6630.2050207@yahoo.com.au>
Date: Wed, 13 Jun 2007 13:36:16 +1000
From: Nick Piggin <nickpiggin@yahoo.com.au>
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To: Martin Steigerwald <Martin@lichtvoll.de>
CC: ck@vds.kolivas.org,
       linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: [ck] Re: kernel scedular
References: <466B45D3.3020104@gmail.com> <alpine.LFD.0.98.0706091731020.20321@woody.linux-foundation.org> (sfid-20070612_171643_519639_3A5C9A70) <200706121925.02286.Martin@lichtvoll.de>
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Martin Steigerwald wrote:
> Am Sonntag 10 Juni 2007 schrieb Linus Torvalds:
> 
> Hi Linus!
> 
> 
>>Ehh.. It was tested extensively by lots of people. It was in -mm for a
>>while, and yes, there have been tons of people testing both. I've
>>followed it, and it seems fair to say that yes, Ingo took a lot of
>>ideas from SD, but CFS seems to have gotten more people involved, and
>>we had several people compare the two, and CFS was generally better.
> 
> 
> Well actually I did not see that general result yet. I have seen quite 
> some testings and quite some reports on the ck patch mailinglist also 
> where in favor of SD. If it matters I will collect those, but I think 
> Ingo already did include most of them in his summary.

I'd just like to say that last time I tested CFS it was very slow
on context switching. I don't know if this has been improved, but I
think it should be.

I'm not talking about context switching with heaps of tasks, but
about lmbench 2-task ping pongs and such.

Also it used pretty small timeslices to achieve interactivity, which
didn't seem like a good idea. I wonder if that's been fixed?

-- 
SUSE Labs, Novell Inc.
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