Messages in this thread | | | Subject | Re: [patch] Re: PostgreSQL pgbench performance regression in 2.6.23+ | From | Mike Galbraith <> | Date | Sat, 07 Jun 2008 19:56:21 +0200 |
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On Sat, 2008-06-07 at 18:16 +0200, Peter Zijlstra wrote:
> The idea was to dynamically detect sync wakeups, who's defining property > is that the waker will sleep after waking the wakee. And who's effect is > pulling tasks together on wakeups - so that we might have the most > benefit of cache sharing. > > So if we were to exclude cross cpu wakeups from this measurement we'd > handicap the whole scheme, because then we'd never measure that its > actually a sync wakeup and wants to run on the same cpu.
Ah, I get it now, thanks.
-Mike
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