From: Bruce Momjian <bruce@momjian.us>
To: Shaun Thomas <sthomas@optionshouse.com>
Cc: Daniel Farina <daniel@heroku.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Ubuntu 12.04 / 3.2 Kernel Bad for PostgreSQL Performance
Date: Wed, 5 Dec 2012 17:41:48 -0500
Message-ID: <20121205224148.GC30887@momjian.us> (raw)
In-Reply-To: <50BFC9D8.4010507@optionshouse.com>
References: <50BF9247.2010800@optionshouse.com>
<CAAZKuFauzW3W4FmvGLZo_+8taY5Gk_6PeLQqZ3kE6M7D0XrJRw@mail.gmail.com>
<50BFC9D8.4010507@optionshouse.com>
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-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@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
--
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: bruce@momjian.us, sthomas@optionshouse.com, daniel@heroku.com
Subject: Re: Ubuntu 12.04 / 3.2 Kernel Bad for PostgreSQL Performance
In-Reply-To: <20121205224148.GC30887@momjian.us>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox