linux-kernel - Re: i686 quirk for AMD Geode

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Message-ID: <4AF9DA6B.803@zytor.com>
Date:	Tue, 10 Nov 2009 13:26:03 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matt Thrailkill <matt.thrailkill@...il.com>
CC:	Pavel Machek <pavel@....cz>, Willy Tarreau <w@....eu>,
	Avi Kivity <avi@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Matteo Croce <technoboy85@...il.com>,
	Sven-Haegar Koch <haegar@...net.de>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: i686 quirk for AMD Geode

On 11/10/2009 01:21 PM, Matt Thrailkill wrote:
> On Tue, Nov 10, 2009 at 12:54 PM, Pavel Machek <pavel@....cz> wrote:
>> *One* CMOV in the inner loop will make your performance go down 20x.
> 
> This is 20x slower than not running at all, right?

And that's the fundamental win of doing a fullscale emulator: you will
always be able to run, at *some* performance level.

	-hpa

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