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..
I'm a little slow today. data=ordered is the default with these patches. You need to mount -o data=writeback.
data=writeback yields pretty much the same iowait results.. (machine 1+2 are around 5%->8% whereas machine 3->8 are at around 0.8%)
Cami
