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Date:	Wed, 11 Nov 2009 11:54:46 +0100
From:	Bernd Petrovitsch <>
To:	Pavel Machek <>
Cc:	Willy Tarreau <>, "H. Peter Anvin" <>,
	Avi Kivity <>,
	Alan Cox <>,
	Matteo Croce <>,
	Sven-Haegar Koch <>,
	Ingo Molnar <>,
Subject: Re: i686 quirk for AMD Geode


On Tue, 2009-11-10 at 21:54 +0100, Pavel Machek wrote:
> > CMOV/NOPL are rarely used, thus have no reason to cause a massive
> > performance drop, but are frequent enough (at least cmov) for almost
> *One* CMOV in the inner loop will make your performance go down 20x.
But it runs.
The pragmatic side is:
If people notices the performance drop, it would be good to have
something in syslog and/or dmesg and/or /proc and/or sysfs
If people do not notice the performance drop, who cares?

Firmix Software GmbH         
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          Embedded Linux Development and Services

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