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To: Timm Morten Steinbeck <timm.steinbeck@kip.uni-heidelberg.de>
cc: linux-kernel@vger.kernel.org
Subject: Re: PATCH: Precise Accounting for 2.6.7
References: <2ah51-6Va-35@gated-at.bofh.it>
From: Andi Kleen <ak@muc.de>
Date: Wed, 23 Jun 2004 16:54:38 +0200
In-Reply-To: <2ah51-6Va-35@gated-at.bofh.it> (Timm Morten Steinbeck's
 message of "Wed, 23 Jun 2004 16:40:11 +0200")
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Timm Morten Steinbeck <timm.steinbeck@kip.uni-heidelberg.de> writes:

> Hi,
>
> we have ported our x86 precise accounting patch from the 2.4 kernel
> series to 2.6.7.

[...]

On many SMP systems it will not be very precise after longer uptimes
because the TSCs of the CPUs drift away noticeable and timestamps
from different CPUs cannot be really compared.

-Andi