Messages in this thread |  | | | Date | Thu, 7 Jun 2007 10:47:11 +0200 | | From | Andi Kleen <> | | Subject | Re: Intel's response Linux/MTRR/8GB Memory Support / Why doesn't the kernel realize the BIOS has problems and re-map appropriately? |
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On Mon, Jun 04, 2007 at 05:59:59PM -0700, Yinghai Lu wrote: > On 6/4/07, Eric W. Biederman <ebiederm@xmission.com> wrote: > > > >Exactly, and given that this is a fairly easy thing to do, and that > >occasionally we see systems where this happens (even if their BIOS is > >later fixed). It is likely worth it for someone to write up the patch > >and that compare MTRRs with available memory, and to complain and > >reserve all memory that MTRRs claim is not write-back. > > > that is good. > Sometime BIOS can not even keep mtrr to the identical between > different CPU in SMP system.
The MTRR code already fixes this case. Or at least mostly -- it doesn't do it for fixed size MTRRs.
> Or reset mtrr according to e820 table.
That would be likely dangerous.
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