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Perf regression in 2.6.32 (Ubuntu 10.04 LTS)

From: Domas Mituzas <midom(dot)lists(at)gmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Perf regression in 2.6.32 (Ubuntu 10.04 LTS)
Date: 2010-09-12 20:31:27
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Lists: pgsql-hackers
Hello folks,

I've been playing around today a lot with sysbench, and observed that 2.6.32 kernel supplied by Ubuntu is having perf regression with PG (which does not affect MySQL), compared to 2.6.28 builds I have.
What I observed can be seen in a paste at (db12 is 2.6.28, db20 is 2.6.32 - 2.6.32-24-server). 

Machines are two socket quad-opterons 2356s. 

oprofile output can be seen at - system has >20% of idle cpu, which is somewhere in the top symbol :)



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