From: Arjan van de Ven <arjan@infradead.org>
To: "Martin A. Fink" <fink@mpe.mpg.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: SATA-performance part 2
Date: Wed, 14 Feb 2007 18:25:11 +0100 [thread overview]
Message-ID: <1171473911.12771.427.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <200702141011.20832.fink@mpe.mpg.de>
> 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)
prev parent reply other threads:[~2007-02-14 17:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-14 9:11 Martin A. Fink
2007-02-14 17:25 ` Arjan van de Ven [this message]
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