Re: [patch] Re: PostgreSQL pgbench performance regression in 2.6.23+

Mike Galbraith
2008-06-07T17:56:34Z

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