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SubjectRe: [patch 0/9] mutex subsystem, -V4

> hm. 16 CPUs hitting the same semaphore at great arrival rates. The cost
> of a short spin is much less than the cost of a sleep/wakeup. The machine
> was doing 100,000 - 200,000 context switches per second.

interesting.. this might be a good indication that a "spin a bit first"
mutex slowpath for some locks might be worth implementing...

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