linux-kernel - Re: [PATCH] x86: trim ram need to check if mtrr is there v3

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Message-id: <200801251119.02565.yinghai.lu@sun.com>
Date:	Fri, 25 Jan 2008 11:19:02 -0800
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: trim ram need to check if mtrr is there v3

On Friday 25 January 2008 10:55:31 am Jeremy Fitzhardinge wrote:
> Ingo Molnar wrote:
> > * Yinghai Lu <Yinghai.Lu@....COM> wrote:
> >
> >   
> >> [PATCH] x86: trim ram need to check if mtrr is there v3
> >>     
> >
> >   
> >>> H. Peter Anvin wrote:
> >>> Looks like the code doesn't check that the CPU *has* MTRRs...
> >>>       
> >> so more strict check if mtrr is there really.
> >> bail out if mtrr all blank when qemu cpu model is used
> >>
> >> and check if is AMD as early
> >> also remove 4G less check, according to hpa.
> >>     
> >
> > thanks, applied. Shouldnt we put in an exception for when there is MTRR 
> > support, but they dont cover anything. Still emit a warning - but 
> > booting up real slow is still better than losing all of RAM and crashing 
> >   
> 
> The problem is re-occuring for me with current x86.git.  Looks like v2 
> did the trick, and v3 is broken...

so the ram size less 4g is way out for your case.

again, can you post /proc/mtrrs with v2 patch?

Thanks

YH
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