Re: Linux: more cores = less concurrency.

On 04/11/2011 02:32 PM, Scott Marlowe wrote:
> On Mon, Apr 11, 2011 at 12:12 PM, Joshua D. Drake<jd(at)commandprompt(dot)com> wrote:
>> On Mon, 11 Apr 2011 13:09:15 -0500, "Kevin Grittner"
>> <Kevin(dot)Grittner(at)wicourts(dot)gov> wrote:
>>> Glyn Astill<glynastill(at)yahoo(dot)co(dot)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.
Anyone know the reason for that?
>> 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
>

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