From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
---|---|
To: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | PSA: If you are running Precise/12.04 upgrade your kernel. |
Date: | 2013-06-06 22:35:06 |
Message-ID: | 51B10E9A.5020700@commandprompt.com |
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Thread: | |
Lists: | pgsql-general |
Hello,
I had the distinct displeasure of staying up entirely too late with a
customer this week because they upgraded to 12.04 and immediately
experienced a huge performance regression. In the process they also
upgraded to PostgreSQL 9.1 from 8.4. There were a lot of knobs to
change/fix/modify because of this. However, nothing I did fixed the
problem. Until... I upgraded the kernel.
Upgrading from 3.2Precise to the 3.9.4 kernel produced the following
results:
I have since verified this on more than one machine as well. Upgrading
the kernel has drastically reduced overall IOWAIT times.
Sincerely,
JD
--
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