From: Willy Tarreau <w@1wt.eu>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Andi Kleen" <andi@firstfloor.org>,
"Ray Lee" <ray-lk@madrabbit.org>, "Bo Brantén" <bosse@acc.umu.se>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Jesse Barnes" <jesse.barnes@intel.com>,
linux-kernel@vger.kernel.org
Subject: Re: x86_64 ten times slower than i386
Date: Tue, 6 Nov 2007 20:53:05 +0100 [thread overview]
Message-ID: <20071106195305.GE1045@1wt.eu> (raw)
In-Reply-To: <4730C575.2020007@zytor.com>
On Tue, Nov 06, 2007 at 11:50:13AM -0800, H. Peter Anvin wrote:
> Willy Tarreau wrote:
> >Just out of curiosity, what would be the problem if the MTRRs covered more
> >than the memory size ? For instance, instead of having 512 MB at 4G, why
> >not have 1G at 4G ?
>
> That's fine, *as long as* you don't have any I/O devices there,
> including things like UMA graphics devices or memory areas used by SMM.
> In theory, those should be marked reserved in e820. In practice...
OK, thanks Peter for the explanation.
Cheers,
Willy
next prev parent reply other threads:[~2007-11-06 20:02 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-03 12:31 x86_64 ten times slower than i386 Bo Brantén
2007-11-03 16:26 ` Matt Mackall
2007-11-03 22:38 ` Bo Brantén
2007-11-03 22:54 ` Matt Mackall
2007-11-03 23:30 ` H. Peter Anvin
2007-11-05 8:06 ` Joseph Fannin
2007-11-05 10:15 ` Bo Brantén
2007-11-05 16:00 ` Bo Brantén
2007-11-05 17:23 ` H. Peter Anvin
2007-11-05 18:46 ` Bo Brantén
2007-11-05 19:11 ` H. Peter Anvin
[not found] ` <2c0942db0711050832t5207ea8bib1f75e59e071ade2@mail.gmail.com>
2007-11-06 0:26 ` Andi Kleen
2007-11-06 1:19 ` H. Peter Anvin
2007-11-06 19:40 ` Willy Tarreau
2007-11-06 19:50 ` H. Peter Anvin
2007-11-06 19:53 ` Willy Tarreau [this message]
2007-11-07 18:38 ` Jesse Barnes
2007-11-10 13:41 ` Bo Brantén
2007-11-05 17:22 ` H. Peter Anvin
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=20071106195305.GE1045@1wt.eu \
--to=w@1wt.eu \
--cc=akpm@linux-foundation.org \
--cc=andi@firstfloor.org \
--cc=bosse@acc.umu.se \
--cc=hpa@zytor.com \
--cc=jesse.barnes@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=ray-lk@madrabbit.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.