Message-ID: <50BFD2FC.3080802@optionshouse.com>
Date: Wed, 5 Dec 2012 17:04:28 -0600
From: Shaun Thomas <sthomas@optionshouse.com>
Reply-To: <sthomas@optionshouse.com>
Organization: Peak6
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To: Bruce Momjian <bruce@momjian.us>
CC: Daniel Farina <daniel@heroku.com>, "pgsql-performance@postgresql.org"
	<pgsql-performance@postgresql.org>
Subject: Re: Ubuntu 12.04 / 3.2 Kernel Bad for PostgreSQL Performance
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	<CAAZKuFauzW3W4FmvGLZo_+8taY5Gk_6PeLQqZ3kE6M7D0XrJRw@mail.gmail.com>
	<50BFC9D8.4010507@optionshouse.com>
	<20121205224148.GC30887@momjian.us>
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On 12/05/2012 04:41 PM, Bruce Momjian wrote:

> 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:

Hmm. I may have to recant. I just removed our fusionIO driver from the 
loop and suddenly everything is honey and roses. It would appear that 
some recent 3.2 kernel patch borks the driver in some horrible way. 
Wihtout it, I see 50-ish percent CPU, 70k tps even with 800 clients... 
Just like 3.4.

So I jumped the gun a bit. Stupid drivers.

I'm still curious why only recent 3.2's cause it, but 3.4 don't. That's 
mighty odd.

-- 
Shaun Thomas
OptionsHouse | 141 W. Jackson Blvd. | Suite 500 | Chicago IL, 60604
312-444-8534
sthomas@optionshouse.com

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