linux-kernel - Re: tbench regression on each kernel release from 2.6.22 -> 2.6.28

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Message-ID: <87r68u1zeb.fsf@basil.nowhere.org>
Date:	Tue, 12 Aug 2008 09:11:08 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: tbench regression on each kernel release from 2.6.22 -> 2.6.28

Christoph Lameter <cl@...ux-foundation.org> writes:

> Maybe what we are seeing is general bloat in kernel execution paths
> due to the growth in complexity?

Wouldn't surprise me. Have you considered doing profiles? 

e.g. just oprofiling the benchmark on the different kernels and see
if there's some obvious difference in the CPU consumers? 

-Andi
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