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Date: Sun, 03 Mar 2013 15:34:53 -0500
From: Jean-David Beyer <jeandavid8@verizon.net>
Organization: Institute for Regimented Whimsey
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To: pgsql-performance@postgresql.org
Subject: Re: hardware upgrade, performance degrade?
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On 03/03/2013 03:16 PM, Josh Berkus wrote:
> Steven,
> 
>> We saw the same performance problems when this new hardware was running
>> cent 6.3 with a 2.6.32-279.19.1.el6.x86_64 kernel and when it was matched
>> to the OS/kernel of the old hardware which was cent 5.8 with
>> a 2.6.18-308.11.1.el5 kernel.
> 
> Oh, now that's interesting.  We've been seeing the same issue (IO stalls
> on COMMIT) ond had attributed it to some bugs in the 3.2 and 3.4
> kernels, partly because we don't have a credible "old server" to test
> against.  Now you have me wondering if there's not a hardware or driver
> issue with a major HW manufacturer which just happens to be hitting
> around now.
> 
> Can you detail your hardware stack so that we can compare notes?
> 
> 
The current Red Hat Enterprise Linux 6.4 kernel is
kernel-2.6.32-358.0.1.el6.x86_64

in case that matters.


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