On Tue, Mar 5, 2013 at 7:02 PM, Josh Berkus <josh@xxxxxxxxxxxx> wrote: > >> Do these basically sniff right? > > Well, the read test seems reasonable. I'm impressed by the speed of the > write test ... how large is the raid card cache? > > And why 8.4? Can you try 9.2? 8.4 because it's what I've got, basically. I might be able to try 9.2 later, but I'm targeting 8.4 right now. 512MB of memory on the card. >> (NOTE: with barriers off, I get a slight increase - 10% - in the >> read-write test, and a larger *decrease* - 15% - with the read-only >> test @ 400. No change @ 100) > > Oh, interesting. Can you reproduce that? I wonder what would cause > read-only to drop without barriers ... I'll try to test again soon. I know that if I use writethrough instead of writeback mode the performance nosedives. Does anybody have suggestions for stripe size? (remember: *4* disks) -- Jon -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
