Hallo Patric,
Kernel 3.2 is extremely bad for Postgresql, as the vm seems to amplify
IO somehow. The difference to 3.13 (the latest LTS kernel for 12.04) is
huge.
https://medium.com/postgresql-talk/benchmarking-postgresql-with-different-linux-kernel-versions-on-ubuntu-lts-e61d57b70dd4#.6dx44vipu
Interesting! To summarize it, 25% performance degradation from best kernel
(2.6.32) to worst (3.2.0), that is indeed significant.
You might consider upgrading your kernel to 3.13 LTS. It's quite easy
[...]
There are other stuff running on the hardware that I do not wish to touch,
so upgrading the particular host is currently not an option, otherwise I
would have switched to trusty.
Thanks for the pointer.
--
Fabien.
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