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

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Message-Id: <200611031939.59208.ak@suse.de>
Date:	Fri, 3 Nov 2006 19:39:59 +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


> Which invalidates the tlb fault hypothesis unless it happens to lie
> on the 2MB boundary.

It's in different pages than the code. 

One drawback of using large TLBs is that the CPUs tend to have a lot less
of them than small TLBs so they can actually thrash quicker if you're unlucky.

Only profiling can tell I guess.

-Andi
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