On Tue, 2004-04-06 at 15:53, camis wrote: > >>The majority of the rest of the machines iowait hover around the 1% > >>mark.. CPU time tends to be about the same, just the iowait is much > >>much higher.. > > > > Very interesting. data=ordered makes fsync more expensive, since it > > ends up syncing more then just the buffers for that one file. Could you > > please try removing data=ordered from machine1? > > Ok.. after leaving it for a few minutes..
[ higher io wait percentage with patches applied ] > What i then tried on machine1 was remounting it noatime,nodiratime and > what was wierd was that the iowait stayed exactly the same, no indication > of dropping at all.. Does the kernel patches change any of the default > mount options at all? If i put the stock 2.6.5 kernel back on without > the patch applied and mount it back as noatime,nodiratime, the iowait > drops back to its normal 1%.. Do you have any numbers for the amount of mail delivered per second on each box? I've got an idea that should help lower the io wait percentage as well, trying a few things here. -chris
