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SubjectRe: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race with preemptible kernel and CPU hotplug
Mathieu Desnoyers wrote:
>
> Sure, here are the updated tables. Basically, they show no significant
> difference between the NOP and the DS segment selector prefix
> approaches.
>

Actually, unless I have blown my T-test completely, they show with a 80%
and 74% confidence (respective for the two benchmarks) that the DS case
is slightly *better* (0.26% and 0.20% better, respective), which makes
it a no-brainer. Doing around 10 runs of each is likely to confirm this
conclusion by pushing it into the 90+% interval.

Note that since the difference is so small, and so can also be due to
some kind of systematic error (lower ambient temperature during the DS
run making the disk drive slightly faster, what have you.)

-hpa


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