On Mon, Apr 11, 2011 at 12:12 PM, Joshua D. Drake <jd@commandprompt.com> wrote:
> On Mon, 11 Apr 2011 13:09:15 -0500, "Kevin Grittner"
> <Kevin.Grittner@wicourts.gov> wrote:
>> Glyn Astill <glynastill@yahoo.co.uk> 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
