Re: [PATCH] trim memory not covered by WB MTRRs

[Justin Piszcz <jpiszcz@lucidpixels.com>]

On Thu, 14 Jun 2007, Jesse Barnes wrote:

> On Thursday, June 14, 2007 1:26:07 Justin Piszcz wrote:
> > On Thu, 14 Jun 2007, Pim Zandbergen wrote:
> > > Thanks for this patch. I was having the exact same symptoms as
> > > Justin Piszcz, on a different, but similar motherboard:
> > >
> > > Motherboard: GigaByte GA-G33-DS3R
> > > BIOS rev: F2
> > > Chipset: Intel G33
> > > Memory: 8GB
> > > Distro: Fedora 7 x86_64
> > > Kernel: kernel-2.6.21-1.3194.fc7
> > >
> > > Building vanilla 2.6.22-rc4 with your patch solved the problem.
> > >
> > > I'm now seeing this in the syslog
> > >
> > > ***************
> > > **** WARNING: likely BIOS bug
> > > **** MTRRs don't cover all of memory, trimmed 196608 pages
> > > ***************
> > >
> > > leaving me 7416672 kB of usable memory.
> > >
> > > If there's any way I can help with more info or testing,
> > > then let me know.
> > >
> > > Thanks,
> > > Pim
>
> Thanks for testing, Pim.  Glad it works for you.  Keep an eye out for
> BIOS upgrades, the next version might fix it.
>
> > That's strange, I guess different chipsets 'chew' up different
> > amounts of memory OR you have your DVT(?) (video-card
> > memory/aperature) set to 256MB? I have mine set to 128MB, in top:
> >
> > Mem:   8039576k total,  6187304k used,  1852272k free,      696k
> > buffers
> >
> > What type of memory are you using and what is your DVT set to?
>
> Different BIOSes will map things differently, so I'd expect differences
> in the "trimmmed xxx pages" message across machines.  But yeah, BIOS
> config options can also affect things, in particular I've heard that
> the fan control options change MTRR setup significantly.
>
> Jesse

To Intel,

When will HECI be supported via the kernel?  When it becomes supported, 
would that alter the MTRR map at all?

Justin.
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