linux-kernel - Re: SATA-performance part 2

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Message-Id: <1171473911.12771.427.camel@laptopd505.fenrus.org>
Date:	Wed, 14 Feb 2007 18:25:11 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Martin A. Fink" <fink@....mpg.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: SATA-performance part 2

> after deinstallation of oprofile and only soft reboots (no hardware power off) 
> these values STAYED (linux 48 MB/s) !! even for a brand new installation of 
> OpenSuSE 10.2 to another partition!
> After a hardware power off everything was again like before (26 MB/s).
> 
> So now the interesting questions to me are:
> 
> 1. What is oprofile doing with my system ?? Especially what is been changed 
> that remains a reboot ??

this is odd. (but encouraging).. the one thing I can imagine oprofile
doing is disabling the nmi_watchdog... you can simulate the same effect
by passing "nmi_watchdog=0" on the kernel commandline
(and there's something in /proc/sys as well to disable it at runtime)

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