Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete - auto detect

[Yinghai Lu]

On Thu, May 1, 2008 at 5:09 AM, Mika Fischer <mika.fischer@xxxxxxxxxx> wrote:
> Yinghai Lu schrieb:
>
> > loop mtrr chunk_size and gran_size from 1M to 2G to find out optimal value.
>  >
>  > so user don't need to add mtrr_chunk_size and mtrr_gran_size,
>  >
>  > if optimal value is not found, print out all list to help select less optimal
>  > value.
>  >
>  > add mtrr_spare_reg_nr= so user could set 2 instead of 1, if the card need more entries.
>
>  On my system x86-latest + this patch and using no boot options gives me
>  this /proc/mtrr:
>  reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
>  reg01: base=0x80000000 (2048MB), size= 512MB: write-back, count=1
>  reg02: base=0xa0000000 (2560MB), size= 256MB: write-back, count=1
>  reg03: base=0xb0000000 (2816MB), size= 256MB: write-back, count=1
>  reg04: base=0xbf700000 (3063MB), size=   1MB: uncachable, count=1
>  reg05: base=0xbf800000 (3064MB), size=   8MB: uncachable, count=1
>  reg06: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
>
>  Which is OK. It could probably collapse reg01-reg03 into one but that's
>  a minor issue (for me at least, there are probably cases where
>  collapsing them might save the user from having to specify the
>  mtrr_spare_reg_nr boot option).

yes. please try mtrr_spare_reg_nr=3 or etc.

YH
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