From: "H. Peter Anvin" <hpa@zytor.com>
To: "Bo Brantén" <bosse@acc.umu.se>
Cc: linux-kernel@vger.kernel.org
Subject: Re: x86_64 ten times slower than i386
Date: Mon, 05 Nov 2007 09:22:52 -0800 [thread overview]
Message-ID: <472F516C.6020702@zytor.com> (raw)
In-Reply-To: <Pine.A41.4.64.0711051110530.803034@stalin.acc.umu.se>
Bo Brantén wrote:
>
>> On Sat, 3 Nov 2007, Matt Mackall wrote:
>>
>>> This is typically due to a problem with the setup of your MTRRs. Try
>
> This is the output from cat /proc/mtrr
>
> reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1
> reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
> reg02: base=0xc0000000 (3072MB), size= 256MB: write-back, count=1
> reg03: base=0xcf800000 (3320MB), size= 8MB: uncachable, count=1
> reg04: base=0xcf700000 (3319MB), size= 1MB: uncachable, count=1
Confusing! Your maximum would be 3072+256M = 3328M, except that because
of the uncachable MTRRs (presumably stolen memory for video), the
maximum is 3319M.
-hpa
prev parent reply other threads:[~2007-11-05 17:27 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
2007-11-07 18:38 ` Jesse Barnes
2007-11-10 13:41 ` Bo Brantén
2007-11-05 17:22 ` H. Peter Anvin [this message]
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