On Tue, Sep 18, 2012 at 2:44 AM, Andrea Suisani <sickpig@xxxxxxxxxxxx> wrote: > On 09/14/2012 10:45 AM, Daniel Farina wrote: >> >> On Fri, Sep 14, 2012 at 12:40 AM, Nikolay Ulyanitsky <lystor@xxxxxxxxx> >> wrote: >>> >>> Hi >>> I compiled the 3.6-rc5 kernel with the same config from 3.5.3 and got >>> the 15-20% performance drop of PostgreSQL 9.2 on AMD chipsets (880G, >>> 990X). > > > [cut] > > >>> Kernel config - http://pastebin.com/cFpg5JSJ >>> >>> Any ideas? >> >> >> Did you tell LKML? It seems like a kind of change that could be found >> using git bisect of Linux, albiet laboriously. > > > > just a pointer to LKML thread: > > https://lkml.org/lkml/2012/9/14/99 There's some interesting discussion of postgres spinlocks in the thread: "Yes, postgress performs loads better with it's spinlocks, but due to that, it necessarily _hates_ preemption." merlin -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
