Nick Piggin wrote:
This actually improves performance noticably (ie. a % or so) on schedule /
wakeup happy benchmarks (tbench, on a dual Xeon with HT using mwait idle).
Here are some numbers on a 2 socket Xeon with HT and mwait idle.
Average of 3 runs, tbench, single client and single server processes on:
samethread samecpu othercpu
before patch: 188.684 MB/s 189.237 MB/s 172.306 MB/s
after patch : 188.425 MB/s 191.628 MB/s 174.224 MB/s
The improvement on other CPUs should be due to the removal of
RMW operations in resched_task.
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