linux-kernel - Re: [BUG?] mtrr sanitizer fails on Latitude E6230

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Message-ID: <CAE9FiQX3mGLmzFCyaHYPBA2QgvxBYr9zarXcUKa5DC0ZtiiWZw@mail.gmail.com>
Date:	Wed, 6 Nov 2013 12:08:12 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Mikael Pettersson <mikpelinux@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG?] mtrr sanitizer fails on Latitude E6230

On Wed, Nov 6, 2013 at 1:16 AM, Mikael Pettersson <mikpelinux@...il.com> wrote:
> I recently got a Dell Latitude E6230 (Ivy Bridge i7-3540M) and noticed that
> the mtrr sanitizer failed on it:
>
> === snip ===
> Linux version 3.12.0 (mikpe@...ley) (gcc version 4.8.3 20131017 (prerelease) (GCC) ) #1 SMP Wed Nov 6 09:46:02 CET 2013
> Command line: ro root=LABEL=/ resume=/dev/sda2 rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=sv-latin1
...
gran_size: 8M  chunk_size: 64M         num_reg: 9      lose cover RAM: 6M
...
> mtrr_cleanup: can not find optimal value
> please specify mtrr_gran_size/mtrr_chunk_size
> === snip ===
>
> For now I'm disabling the mtrr sanitizer in this machine's kernel.

Can you try to boot with "mtrr_gran_size=8m mtrr_chunk_size=64m" ?

Thanks

Yinghai
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