RFC x86 SMP: enables core-pair topology detection for AMD CPUs
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- v1 RFC Latest2 patches 6 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | x86 SMP: enables core-pair topology detection for AMD CPUsxen/ xen/ xen/ +2 more | +25 | 0 replies | |
| 2/2 | x86 SMP: enables core-pair topology detection for AMD CPUsxen/ xen/ xen/ +1 more | +63 | 1 reply |
Reviews trailers per patch
1 of 2 patches has a Reviewed-by or Acked-by of their own; the series has one for all of them.
| Patch | George Dunlap | Jan Beulich |
|---|---|---|
| Series | A-b | A-b |
| 1/2 | ||
| 2/2 | A-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH][RFC][0/2] x86 SMP: enables core-pair topology detection for AMD CPUs
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