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SubjectRe: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race with preemptible kernel and CPU hotplug
Jeremy Fitzhardinge wrote:
>
>> Xeon 2.0GHz
>>
>>
>> Summary
>>
>> no lock prefix (s) with lock prefix (s) Speedup
>> make -j1 kernel/ 33.94 +/- 0.07 34.91 +/- 0.27 2.8 %
>> hackbench 50 2.99 +/- 0.01 3.74 +/- 0.01 25.1 %
>>
>
> Yeah, that's more severe than I would have expected. Perhaps I have AMD
> numbers in my head.
>

He doesn't specify what kind of Xeon it is (there are three completely
different CPUs under the Xeon brand name: P3 Xeon, P4 Xeon, and Core 2
Xeon), but I think it's a P4 Xeon.
Netburst sucked in so many ways, and this is one of them.

-hpa




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