From: Keir Fraser <keir.fraser@eu.citrix.com>
To: Jan Beulich <jbeulich@novell.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: c/s 19576 vs. AMD systems
Date: Wed, 29 Apr 2009 10:43:32 +0100 [thread overview]
Message-ID: <C61DDFD4.9B5B%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <49F8318D.76EA.0078.0@novell.com>
On 29/04/2009 09:53, "Jan Beulich" <jbeulich@novell.com> wrote:
> I'm afraid this change is going to hurt on AMD systems where memory extends
> beyond the 4Gb boundary: Both such systems that I have direct access to
> have their Intel MTRRs only defined up to the 4Gb boundary, yet through
> the use of AMD specific MSRs (SYS_CFG.Tom2ForceMemTypeWB and TOM2)
> the default memory type for everything beyond the 4Gb boundary is WB.
> On these systems there shouldn't be any clipping. I certainly can put together
> a patch for this, but it'll take me a couple of days until I'd get to it.
What do you suggest? Make the clip Intel-specific? We've only seen problems
with (a very few) Intel boxes, so handling AMD at all may be quite
unnecessary.
-- Keir
next prev parent reply other threads:[~2009-04-29 9:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-29 8:53 c/s 19576 vs. AMD systems Jan Beulich
2009-04-29 9:43 ` Keir Fraser [this message]
2009-04-29 10:27 ` Jan Beulich
2009-04-29 10:49 ` Keir Fraser
2009-04-29 17:23 ` Frank Arnold
2009-04-30 6:58 ` Jan Beulich
2009-04-30 6:59 ` Keir Fraser
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