linux-kernel - Re: 2.6.21 -> 2.6.22 & 2.6.23-rc8 performance regression

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Message-ID: <p73myv36tmz.fsf@bingen.suse.de>
Date:	01 Oct 2007 12:01:24 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Denys" <nuclearcat@...learcat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.21 -> 2.6.22 & 2.6.23-rc8 performance regression

"Denys" <nuclearcat@...learcat.com> writes:

> by mistake i will miss a point (it can detect bug easily, IF softirq in 
> mpstat 1 will jump up to 30+%. On 2.6.21 it is always staying +-10%, on 
> "buggy" version it jumps up to 100%. Now cause less load at night up to 30-
> 50%, so on hardware it is not very noticeable (thats why maybe not much 
> feedbacks), i am trying to utilise hardware maximum as possible - so i feel 
> regressions much more.

You could use oprofile to find where the CPU time is spent

-Andi
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