linux-kernel - Re: Linux 2.6.23

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Date:	Fri, 12 Oct 2007 07:46:15 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Nicholas Miell <nmiell@...cast.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.23

* Nick Piggin <nickpiggin@...oo.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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