From: Arjan van de Ven <arjan@infradead.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Diego M. Vadell" <dvadell@linuxclusters.com.ar>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: PAT and MTRRs
Date: Sun, 26 Oct 2008 17:34:58 -0700 [thread overview]
Message-ID: <20081026173458.44c5a036@infradead.org> (raw)
In-Reply-To: <49050995.4080508@zytor.com>
On Sun, 26 Oct 2008 17:21:41 -0700
"H. Peter Anvin" <hpa@zytor.com> wrote:
> Arjan van de Ven wrote:
> >
> > PAT can't make memory cachable that the MTRR's have as uncachable.
> > What PAT *can* do is, within an MTRR, do fine grained mapping...
> >
>
> Now, if it wasn't for the braindamage called ACPI and SMM, we could
> have cleared the MTRR settings and just used PAT...
>
yeah.. one thing we need to investigate is if we can set the default
"no mtrr coverage" value to cached
(and also.. to check we don't set that to uncached if the bios had it
set to cached..)
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for ape savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2008-10-27 0:34 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-26 23:46 PAT and MTRRs Diego M. Vadell
2008-10-27 0:12 ` Arjan van de Ven
2008-10-27 0:21 ` H. Peter Anvin
2008-10-27 0:34 ` Arjan van de Ven [this message]
2008-10-27 0:38 ` H. Peter Anvin
2008-10-27 5:17 ` Yinghai Lu
2008-10-31 22:42 ` Diego M. Vadell
2008-10-31 23:19 ` Yinghai Lu
2008-10-31 23:35 ` Yinghai Lu
2008-11-11 14:30 ` Diego M. Vadell
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