From: ebiederm@xmission.com (Eric W. Biederman)
To: Andi Kleen <ak@muc.de>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>,
linux-kernel@vger.kernel.org
Subject: Re: question about MTRR areas on x86_64
Date: 14 Oct 2004 04:49:16 -0600 [thread overview]
Message-ID: <m1acupefrn.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <m3vfdox14o.fsf@averell.firstfloor.org>
Andi Kleen <ak@muc.de> writes:
> Markus Lidel <Markus.Lidel@shadowconnect.com> writes:
> >
> > Could it be because the machine has too much memory, or is there a bug in the
> I2O driver?
>
>
> The problem comes from the BIOS who set up reg00 to be overlapping
> over other areas. The Linux MTRR driver cannot deal with overlapping
> MTRRs, in fact it is sometimes impossible because it could run
> out of registers or violate some of the MTRR restrictions.
And the BIOS is using overlapping MTRRs because otherwise it would run
out.
> It's a long standing problem, eventual fix will be to get rid
> of MTRRs completely and only use PAT. But it needs a bit more work.
That would be nice to see.
Eric
next prev parent reply other threads:[~2004-10-14 10:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2M5w2-y8-3@gated-at.bofh.it>
2004-10-05 22:15 ` question about MTRR areas on x86_64 Andi Kleen
2004-10-14 10:49 ` Eric W. Biederman [this message]
2004-10-14 14:04 ` Markus Lidel
2004-10-05 21:54 Markus Lidel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=m1acupefrn.fsf@ebiederm.dsl.xmission.com \
--to=ebiederm@xmission.com \
--cc=Markus.Lidel@shadowconnect.com \
--cc=ak@muc.de \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.