Re: [Xen-devel] Re: [PATCH][RFC][0/2] x86 SMP: enables core-pair topology detection for AMD CPUs

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

Sorry for the late request -- should these patches be back-ported to
4.1.2?  Otherwise anyone using AMD Magny-cours may have a significant
performance hit when using 4.1.

 -George

On Mon, Jun 27, 2011 at 6:26 PM, Wei Huang <wei.huang2@xxxxxxx> wrote:
> Thanks, Jan and George. I attach the latest version which fixes the
> indentation issues.
>
> -Wei
>
>
> On 06/27/2011 03:58 AM, Jan Beulich wrote:
>>>>>
>>>>> On 24.06.11 at 00:51, Wei Huang<wei.huang2@xxxxxxx>  wrote:
>>>
>>> Hi,
>>>
>>> The following two patches enable core-pair topology detection for AMD
>>> CPUs. The main idea is to record compute unit information into
>>> cpuinfo_x86 and use it when building sibling map. The sibling map will
>>> be used by Xen credit scheduler to coordinate VCPU scheduling in a
>>> fashion similar to SMT. This code is very similar to upstream Linux
>>> kernel.
>>>
>>> Regarding the performance improvement, I saw ~8% improvement running
>>> kernel compilation on Dom0 with this patch. Anrea Przywara ran a POVRay
>>> benchmark using this patch and he saw ~5% improvement. No perf
>>> degradation was seen so far.
>>>
>>> Please review.
>>
>> Apart from some indentation issues these look fine to me.
>>
>> Jan
>>
>>> Thanks,
>>> -Wei
>>
>>
>>
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel