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Message-ID: <20071012054615.GA22256@elte.hu>
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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