Date: Fri, 12 Oct 2007 07:46:15 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Nicholas Miell <nmiell@comcast.net>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux 2.6.23
Message-ID: <20071012054615.GA22256@elte.hu>
References: <alpine.LFD.0.999.0710091346490.5039@woody.linux-foundation.org> <1191996740.8694.7.camel@entropy> <20071010101452.GA25433@elte.hu> <200710111916.23633.nickpiggin@yahoo.com.au>
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* Nick Piggin <nickpiggin@yahoo.com.au> wrote:

> ;) I think you snipped the important bit:
> 
> "the peak is terrible but it has virtually no dropoff and performs 
> better under load than the default 2.6.21 scheduler." (verbatim)

hm, i understood that peak remark to be in reference to FreeBSD's 
scheduler (which the FreeBSD guys are primarily interested in 
obviously), not v2.6.21 - but i could be wrong.

In any case, there is indeed a regression with sysbench and a low number 
of threads, and it's being fixed. The peak got improved visibly in 
sched-devel:

  http://people.redhat.com/mingo/misc/sysbench-sched-devel.jpg

but there is still some peak regression left, i'm testing a patch for 
that.

	Ingo
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