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

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 27.06.11 at 19:26, Wei Huang <wei.huang2@xxxxxxx> wrote:
> Thanks, Jan and George. I attach the latest version which fixes the 
> indentation issues.

Acked-by: Jan Beulich <jbeulich@xxxxxxxxxx>

> 
> -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
>>
>>
>>




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