| From: | Shaun Thomas <sthomas(at)optionshouse(dot)com> |
|---|---|
| To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
| Cc: | Stuart Bishop <stuart(at)stuartbishop(dot)net>, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: PSA: If you are running Precise/12.04 upgrade your kernel. |
| Date: | 2013-06-20 18:54:59 |
| Message-ID: | 51C35003.5010701@optionshouse.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
On 06/17/2013 04:00 PM, Joshua D. Drake wrote:
>> http://postgresql.1045698.n5.nabble.com/Ubuntu-12-04-3-2-Kernel-Bad-for-PostgreSQL-Performance-td5735284.html
>>
>> tl;dr for that thread seems to be a driver problem (fusionIO?), I'm
>> unsure if Ubuntu specific or in the upstream kernel.
That instance wasn't a driver problem. The problem was that the FusionIO
driver uses kernel threads to perform IO, and it seems that several of
the 3.x kernels have issues with task migration using the new CFS CPU
scheduler which replaced the O(1) one.
The next thread related to this that fixed our particular case was this one:
http://www.postgresql.org/message-id/50E4AAB1.9040902@optionshouse.com
--
Shaun Thomas
OptionsHouse | 141 W. Jackson Blvd. | Suite 500 | Chicago IL, 60604
312-676-8870
sthomas(at)optionshouse(dot)com
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