Jeff wrote:
I'd done some testing a while ago on the schedulers and at the time
deadline or noop smashed cfq. Now, it is 100% possible since then
that they've made vast improvements to cfq and or the VM to get better
or similar performance. I recall a vintage of 2.6 where they severely
messed up the VM. Glad I didn't upgrade to that one :)
Here's the old post:
http://archives.postgresql.org/pgsql-performance/2008-04/msg00155.php
pgiosim doesn't really mix writes into there though, does it? The mixed
read/write situations are the ones where the scheduler stuff gets messy.
--
Greg Smith 2ndQuadrant Baltimore, MD
PostgreSQL Training, Services and Support
greg@xxxxxxxxxxxxxxx www.2ndQuadrant.com
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