RE: [Xen-users] FIXED!!! amd64 system only seeing 3.5gb instead of4gb of memory

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> On Mon, Jun 18, 2007 at 11:35:56AM +0200, Petersson, Mats wrote:
> Hello,
> 
> > > The fix makes me think that the bug is a bit heisenbug-ish... but it
> > > works for me.
> >
> > Yes, it looks like a "compiler issue" that is fixed by forcing the
> > compiler to not optimize the variable by using volatile - not the ideal
> > solution, but I guess fixing the compiler may be even more difficult.
> > [Not knowing what the code looks like - but I suppose the "cont"
> > variable isn't updated by an interrupt or external hardware!]
> 
> I thought the same, but one grub stage2 file behaves differently on
> two motherboards. It fails to detect[1] e820 memory map on my computer,
> but copied to friend's one works perfectly. I think if it's
> compiler bug[2] that copy shouldn't work on both computers.

What are the differences between the two motherboards?

How positive are you that it was actually installed correctly on your computer? 
Is the updated stage2 file definitely in /boot/grub?

Does Linux itself definitely detect the e820 memory map correctly in both 
computers? Are you able to post the dmesg memory map under plain linux to the 
list?

James


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