linux-kernel - Re: File corruption when using kernels 2.6.18+

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Message-ID: <20071003213011.0962c5c5@the-village.bc.nu>
Date:	Wed, 3 Oct 2007 21:30:11 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Pekka Enberg" <penberg@...helsinki.fi>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Neil Romig" <neil@...ig.demon.co.uk>,
	linux-kernel@...r.kernel.org, hyoshiok@...aclelinux.com,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: File corruption when using kernels 2.6.18+

On Wed, 3 Oct 2007 22:35:24 +0300
"Pekka Enberg" <penberg@...helsinki.fi> wrote:

> Hi Linus,
> 
> On 10/3/07, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> > I would bet that the reason the intel-optimized memcpy triggers this is
> > that the non-temporal stores just means that you go out directly on the
> > bus, and it probably just shows a weakness in the chipset or bus that
> > doesn't show with the normal cacheline accesses.
> 
> But that should show up with memtest too, no?

Not neccessarily. The old VIA memory copying bug only showed up with
prefetching and mmx store patterns. That was a hardware flaw that took
extreme memory utilisation to show up - so it does occur but thats not to
say it is the cause

Alan
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