linux-kernel - Re: 2.6.19-rc1: x86_64 slowdown in lmbench's fork

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Date:	Fri, 3 Nov 2006 18:47:49 +0100
From:	Andi Kleen <ak@...e.de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	tim.c.chen@...ux.intel.com, Adrian Bunk <bunk@...sta.de>,
	linux-kernel@...r.kernel.org, discuss@...-64.org
Subject: Re: 2.6.19-rc1: x86_64 slowdown in lmbench's fork


> So unless there is some other array that is sized by NR_IRQs
> in the context switch path which could account for this in
> other ways.  It looks like you just got unlucky.


TLB/cache profiling data might be useful?
My bet would be more on cache effects.
 
> The only hypothesis that I can seem to come up with is that maybe
> you are getting an extra tlb now that you didn't use to.  
> I think the per cpu area is covered by huge pages but maybe not.

It should be.

-Andi
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