From: Peter Rabbitson <rabbit@rabbit.us>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Terrible IO performance when using 4GB of RAM on a 32 bit machine
Date: Fri, 22 Jun 2007 01:02:05 +0200 [thread overview]
Message-ID: <467B036D.4050100@rabbit.us> (raw)
In-Reply-To: <467AD101.4020107@zytor.com>
H. Peter Anvin wrote:
> Peter Rabbitson wrote:
>> I have captured dmesg output without mem[5], with mem=3900M[6] and
>> mem=2048M[7].
>>
>
> What does /proc/mtrr look like in the two cases?
>
Identical for mem=3900 and without it.
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= 512MB: write-back, count=1
reg03: base=0xe0000000 (3584MB), size= 256MB: write-back, count=1
reg04: base=0xf0000000 (3840MB), size= 128MB: write-back, count=1
reg05: base=0xf8000000 (3968MB), size= 32MB: write-back, count=1
Peter
next prev parent reply other threads:[~2007-06-21 23:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-21 17:26 Terrible IO performance when using 4GB of RAM on a 32 bit machine Peter Rabbitson
2007-06-21 19:26 ` H. Peter Anvin
2007-06-21 23:02 ` Peter Rabbitson [this message]
[not found] <fa.8+Qu4ZH2B8PP3bRaZ5LNdUcsFIQ@ifi.uio.no>
[not found] ` <fa.X6rjOVHT6SoOzt6SHEJROeRgf98@ifi.uio.no>
[not found] ` <fa.qwrQSldd4OzDT6RgWE5P1BD9PJw@ifi.uio.no>
2007-06-22 0:00 ` Robert Hancock
2007-06-22 8:29 ` Peter Rabbitson
2007-06-22 14:36 ` Robert Hancock
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