From: Shaun Thomas <sthomas@optionshouse.com>
To: 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 16:25:28 -0600
Message-ID: <50BFC9D8.4010507@optionshouse.com> (raw)
In-Reply-To: <CAAZKuFauzW3W4FmvGLZo_+8taY5Gk_6PeLQqZ3kE6M7D0XrJRw@mail.gmail.com>
References: <50BF9247.2010800@optionshouse.com>
<CAAZKuFauzW3W4FmvGLZo_+8taY5Gk_6PeLQqZ3kE6M7D0XrJRw@mail.gmail.com>
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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.
--
Shaun Thomas
OptionsHouse | 141 W. Jackson Blvd. | Suite 500 | Chicago IL, 60604
312-444-8534
sthomas@optionshouse.com
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To: pgsql-performance@postgresql.org
Cc: sthomas@optionshouse.com, daniel@heroku.com
Subject: Re: Ubuntu 12.04 / 3.2 Kernel Bad for PostgreSQL Performance
In-Reply-To: <50BFC9D8.4010507@optionshouse.com>
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