Originally Posted by gonzo_s
P.S. Something is really wrong with the i/o scheduler in the recent linux kernels. I noticed some time ago, especially when copying a large file (=> 1 gigabyte) and trying to do something simultaneously with the system... There is a regression somewhere.
the CFQ sched seems b0rken since 2.6.32 so we need to use the DEADLINE sched ( which will give some slowness on large I/O operations )