On Feb 8, 2010, at 11:35 PM, david@xxxxxxx wrote:
And, yes, the whole I/O scheduling approach in Linux was just completely redesigned for a very recent kernel update. So even what we think we know is already obsolete in some respects.
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 -- Jeff Trout <jeff@xxxxxxxxxxxxx> http://www.stuarthamm.net/ http://www.dellsmartexitin.com/ -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
