Re: Some performance testing? - Mailing list pgsql-performance

From Michael Nolan
Subject Re: Some performance testing?
Date
Msg-id CAOzAquKKV0QisQZ9bUDXkepm5C-Vj0oi4CVG3zjFxNQC-562Tg@mail.gmail.com
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In response to Re: Some performance testing?  (Josh Berkus <josh@agliodbs.com>)
Responses Re: Some performance testing?
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On Wed, Apr 8, 2015 at 3:05 PM, Josh Berkus <josh@agliodbs.com> wrote:
On 04/07/2015 11:07 AM, Mel Llaguno wrote:
> Care to elaborate? We usually do not recommend specific kernel versions
> for our customers (who run on a variety of distributions). Thanks, M.

You should.

http://www.databasesoup.com/2014/09/why-you-need-to-avoid-linux-kernel-32.html

Performance is literally 2X to 5X different between kernels.

 
Josh, there seems to be an inconsistency in your blog.  You say 3.10.X is safe, but the graph you show with the poor performance seems to be from 3.13.X which as I understand it is a later kernel.  Can you clarify which 3.X kernels are good to use and which are not?
--
Mike Nolan

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