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Re: Ubuntu 12.04 / 3.2 Kernel Bad for PostgreSQL Performance - Mailing list pgsql-performance

From Shaun Thomas
Subject Re: Ubuntu 12.04 / 3.2 Kernel Bad for PostgreSQL Performance
Date
Msg-id 50BFD2FC.3080802@optionshouse.com
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In response to Re: Ubuntu 12.04 / 3.2 Kernel Bad for PostgreSQL Performance  (Bruce Momjian <bruce@momjian.us>)
Responses Re: Ubuntu 12.04 / 3.2 Kernel Bad for PostgreSQL Performance
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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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