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 | Sat, 15 Sep 2012 06:11:02 +0200 |
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On Fri, 2012-09-14 at 23:27 +0200, Borislav Petkov wrote: > (Adding everybody to CC and leaving the below for reference.) > > Guys, > > as Nikolay says below, we have a regression in 3.6 with pgbench's > benchmark in postgresql. > > I was able to reproduce it on another box here and did a bisection run. > It pointed to the commit below. > > And yes, reverting that commit fixes the issue here.
My wild (and only) theory is that this is userspace spinlock related. If so, starting the server and benchmark SCHED_BATCH should not only kill the regression, but likely improve throughput as well.
-Mike
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