H. Peter Anvin wrote:
> Followup to: <[EMAIL PROTECTED]>
> By author: Mikael Pettersson <[EMAIL PROTECTED]>
> In newsgroup: linux.dev.kernel
>
>> Before people get too exited about the x86 Page Attribute Table ...
>> Does Linux use mode B (CR4.PSE=1) or mode C (CR4.PAE=1) paging?
>> If so, known P6 errata must be taken into account.
>> In particular, Pentium III errata E27 and Pentium II errata A56
>> imply that only the low four PAT entries are working for 4KB
>> pages, if CR4.PSE or CR4.PAE is enabled.
>>
>
>
> All of the above. Sounds like PAT should be declared broken on these
> chips.
>
> -hpa
We can do set PAT entry one to be write combined. Currently it doesn't
look like anyone is using write through page mapping anywhere in the
kernel (Just PAGE_PWT set). Am I correct in that assumption?
-Jeff
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
Please read the FAQ at http://www.tux.org/lkml/
