poll: problems with MTRRs?

E K ekg_ab-FFYn/CNdgSA at public.gmane.org
Mon Mar 16 14:31:50 UTC 2009





--- On Sun, 3/15/09, D. Hugh Redelmeier <hugh-pmF8o41NoarQT0dZR+AlfA at public.gmane.org> wrote:

> From: D. Hugh Redelmeier <hugh-pmF8o41NoarQT0dZR+AlfA at public.gmane.org>
> Subject: [TLUG]: poll: problems with MTRRs?
> To: "Toronto Linux Users Group" <tlug-lxSQFCZeNF4 at public.gmane.org>
> Received: Sunday, March 15, 2009, 4:58 PM
> How many of you have x86 computers with 4G or more of RAM?
> 
> On many such systems, the MTRRs are set up by the BIOS in a
> way that
> conflicts with X.
> 
> I have this problem in both of my machines with 4G or more
> of RAM (IBM
> ThinkPad x61t and HP Pavilion A6245n).
> 
> Could you run the following command and tell me about your
> system if
> if grep prints anything?
> 	dmesg | grep -i mtrr
> 
> You might see things like:
>   mtrr: type mismatch for d0000000,10000000 old: write-back
> new: write-combining
>   mtrr: no MTRR for d0000000,10000000 found
> 
> I'd like to know what distro you are running
> (/etc/issue) and
> what kernel you are running (/proc/version).
> 
> I'd like to know what your MTRR's look like.  Could
> you tell me what
> /proc/mtrr says?
> 
> I hope to be able to help you if you do find these messages
> in the
> dmesg output.

I got a Dell Inpiron 530 with 4Gb RAM. The BIOS sees all the 4Gb and KUbuntu sees only 3Gb of it. I undertood that that was an upper limit for all 32bit OSes. In any case, I am running KUbuntu 7.10 kernel 2.6.22.14-generic and my MTRR line is 

[   42.397018] mtrr: no more MTRRs available

EK
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