Andre, Please see the related thread on this list, "High CPU usage / load average after upgrading to Ubuntu 12.04". You may be experiencing some of the same issues. General perspective seems to be that kernels 3.0 through 3.4 have serious performance issues.
-- Josh Berkus PostgreSQL Experts Inc. http://pgexperts.com -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
