On Tue, Feb 14, 2012 at 6:45 PM, Greg Smith <g...@2ndquadrant.com> wrote:

> Minimal changes were made to the postgresql.conf.  shared_buffers=2GB,
> checkpoint_segments=64, and I left wal_buffers at its default so that 9.1
> got credit for that going up.  See
> http://highperfpostgres.com/results-write-9.2-cf4/541/pg_settings.txt for a
> full list of changes, drive mount options, and important kernel settings.
>  Much of that data wasn't collected in last year's pgbench-tools runs.

Please retest with wal_buffers 128MB, checkpoint_segments 1024

Best to remove any tunable resource bottlenecks before we attempt
further analysis.

 Simon Riggs                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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