linux-kernel - Re: [git pull] x86 fixes

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Date:	Tue, 09 Sep 2008 10:01:44 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Krzysztof Halasa <khc@...waw.pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	x86 maintainers <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [git pull] x86 fixes

Andi Kleen wrote:
> Krzysztof Halasa <khc@...waw.pl> writes:
> 
>> Linus Torvalds <torvalds@...ux-foundation.org> writes:
>>
>>>  - "modern 32-bit": PPro and better. Can take CMOV, MMX and TSC for 
>>>    granted.
>> VIA C3 (Samuel 2/Ezra, 600 - 1000 MHz?, common on VIA EPIA-*: home
>> theatres etc) can't CMOV.
> 
> AFAIK they fixed that in newer BIOS with a microcode update. It's 
> slow, but it works.
> 

Yes, but if it's slower than jmp+mov than you actively want to avoid it.

	-hpa
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