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SubjectRe: [PATCH] trim memory not covered by WB MTRRs
Hi!

> > > On some machines, buggy BIOSes don't properly setup WB MTRRs to
> > > cover all available RAM, meaning the last few megs (or even gigs)
> > > of memory will be marked uncached. Since Linux tends to allocate
> > > from high memory addresses first, this causes the machine to be
> > > unusably slow as soon as the kernel starts really using memory
> > > (i.e. right around init time).
> > >
> > > + if ((highest_addr >> PAGE_SHIFT) != end_pfn) {
> > > + printk(KERN_WARNING "***************\n");
> > > + printk(KERN_WARNING "**** WARNING: likely BIOS bug\n");
> > > + printk(KERN_WARNING "**** MTRRs don't cover all of "
> > > + "memory, trimmed %ld pages\n", end_pfn -
> > > + (highest_addr >> PAGE_SHIFT));
> > > + printk(KERN_WARNING "***************\n");
> > > + end_pfn = highest_addr >> PAGE_SHIFT;
> >
> > Missing 4K of memory is not worth 4K of junk in syslog per boot. Can
> > you drop the stars and stop shouting?
>
> How missing about 1G of memory? We already discussed this, and Andi and
> Venki felt that either a panic or a really obnoxious message was the
> way to go...

Just use panic, then.
Pavel,
who still thinks anyone missing 1GB of ram will not miss
friendly notice in dmesg, even if it goes without 20 stars.

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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