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:
http://www.commandprompt.com/blogs/joshua_drake/2013/06/the_steaming_pile_that_is_precise_with_kernel_32/
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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