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

[Wei Huang <wei.huang2@xxxxxxx>]

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.

Thanks,
-Wei




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