Timothy Miller wrote:
>>
>> The purpose is that there is a slight task-switching speed advantage if
>> the address is in the bottom 4 GB. Since this affects every process,
>> and most processes use very little TLS, this is worthwhile.
>>
>> This is fundamentally due to a K8 design flaw.
>
> Is there an explicit check somewhere for this? Are the page tables laid
> out differently?
>
No, there are two ways to load the FS base register: use a descriptor,
which is limited to 4 GB but is faster, or WRMSR, which is slower, but
unlimited.
-hpa
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Thu May 15 2003 - 22:00:32 EST