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
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