On Mon, Apr 11, 2011 at 12:12 PM, Joshua D. Drake <jd@xxxxxxxxxxxxxxxxx> wrote: > On Mon, 11 Apr 2011 13:09:15 -0500, "Kevin Grittner" > <Kevin.Grittner@xxxxxxxxxxxx> wrote: >> Glyn Astill <glynastill@xxxxxxxxxxx> wrote: >> >>> The new server uses 4 x 8 core Xeon X7550 CPUs at 2Ghz >> >> Which has hyperthreading. >> >>> our current servers are 2 x 4 core Xeon E5320 CPUs at 2Ghz. >> >> Which doesn't have hyperthreading. >> >> PostgreSQL often performs worse with hyperthreading than without. >> Have you turned HT off on your new machine? If not, I would start >> there. > > And then make sure you aren't running CFQ. > > JD This++ Also if you're running a good hardware RAID controller, jsut go to NOOP -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
