Simon,

> We should run tests with much higher wal_buffers numbers to nullify the
> effect described above and reduce contention. That way we will move
> towards the log disk speed being the limiting factor, patch or no patch.

I've run such tests, at a glance they do seem to improve performance.   I 
need some time to collate the results.

-- 
--Josh

Josh Berkus
Aglio Database Solutions
San Francisco

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