From: Robert Hancock <hancockr@shaw.ca>
To: Lukas Hejtmanek <xhejtman@ics.muni.cz>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: mtrr madness
Date: Mon, 01 Sep 2008 11:19:01 -0600 [thread overview]
Message-ID: <48BC2405.9070403@shaw.ca> (raw)
In-Reply-To: <fa.oAfJTOqZ/UBF74k5hFotOE73/z4@ifi.uio.no>
Lukas Hejtmanek wrote:
> Hello,
>
> it seems that all linux kernels contain a bug with mtrr:
>
> cat /proc/mtrr
> reg00: base=0x00000000 ( 0MB), size=198656MB: write-back, count=1
> reg01: base=0x80000000 (2048MB), size=197120MB: write-back, count=1
> reg02: base=0x9fc00000 (2556MB), size=196612MB: uncachable, count=1
> reg03: base=0x100000000 (4096MB), size=200704MB: write-back, count=1
> reg04: base=0x200000000 (8192MB), size=204800MB: write-back, count=1
>
> (watch the size)
>
> it is definitely present in the kernels 2.6.16, 2.6.24, 2.6.25, 2.6.26.
>
> 198656 is 0x3080000000, the correct value would be 0x80000000, similarly
> 197120 is 0x3020000000, the correct would be 0x20000000.
Those are set up by the BIOS, so it would be what's at fault. I think we
may be adding something to fix this up though?
next parent reply other threads:[~2008-09-01 17:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.oAfJTOqZ/UBF74k5hFotOE73/z4@ifi.uio.no>
2008-09-01 17:19 ` Robert Hancock [this message]
2008-09-01 17:25 ` Yinghai Lu
2008-09-01 14:25 Lukas Hejtmanek
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