Messages in this thread | | | Subject | Re: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets - bisected | From | Mike Galbraith <> | Date | Thu, 27 Sep 2012 07:44:21 +0200 |
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On Thu, 2012-09-27 at 07:18 +0200, Borislav Petkov wrote: > On Thu, Sep 27, 2012 at 07:09:28AM +0200, Mike Galbraith wrote: > but how does that affect pgbench and ilk that must spread regardless > > of footprints. > > Well, how do you measure latency of the 1 process in the 1:N case? Maybe > pipeline stalls of the 1 along with some way to recognize it is the 1 in > the 1:N case.
Best is to let userland tell us it's critical. Smarts are expensive. A class of it's own (my wakees do _not_ preempt me, and I don't care that you think this is unfair to the unwashed masses who will otherwise _starve_ without me feeding them) makes sense for these guys.
-Mike
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