From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Shaun Thomas <sthomas(at)optionshouse(dot)com> |
Cc: | Daniel Farina <daniel(at)heroku(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: Ubuntu 12.04 / 3.2 Kernel Bad for PostgreSQL Performance |
Date: | 2012-12-05 22:41:48 |
Message-ID: | 20121205224148.GC30887@momjian.us |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-performance |
On Wed, Dec 5, 2012 at 04:25:28PM -0600, Shaun Thomas wrote:
> On 12/05/2012 04:19 PM, Daniel Farina wrote:
>
> >Is 3.2 a significant regression from previous releases, or is 3.4 just
> >faster? Your wording only indicates that "older kernel is slow," but
> >your tone would suggest that you feel this is a regression, cf.
>
> It's definitely a regression. I'm trying to pin it down, but the
> 3.2.0-24 kernel didn't do the CPU drain down to single-digits on
> that client load test. I'm working on 3.2.0-30 and going down to
> figure out which patch might have done it.
>
> Older kernels performed better. And by older, I mean 2.6. Still not
> 3.4 levels, but that's expected. I haven't checked 3.0, but other
> threads I've read suggest it had less problems. Sorry if I wasn't
> clear.
Ah, that is interesting about 2.6. I had wondered how Debian stable
would have performed, 2.6.32-5. This relates to a recent discussion
about the appropriateness of Ubuntu for database servers:
http://archives.postgresql.org/pgsql-performance/2012-11/msg00358.php
Thanks.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
From | Date | Subject | |
---|---|---|---|
Next Message | Shaun Thomas | 2012-12-05 23:04:28 | Re: Ubuntu 12.04 / 3.2 Kernel Bad for PostgreSQL Performance |
Previous Message | Shaun Thomas | 2012-12-05 22:25:28 | Re: Ubuntu 12.04 / 3.2 Kernel Bad for PostgreSQL Performance |