This is an old problem, and not related to the dvd-ram itself. If you
dirty lots of data and the target device is slow, kswapd/bdflush
will go crazy trying to free up memory. It should behave better on
2.4.1, where we impose a global limit on locked buffers. Try and run
a vmstat 1 while doing the copy, and send that along.
> data going over the SCSI controller. Reading data from DVD-RAMs is done with
> 2.7 MB/s (2x) by the drive and does not cause any problems at all.
Reading is much easier to control.
> There is a 4x Teac burner connected to the SCSI controller as well.
> Burning CDs does not raise the system load or cause any other problems.
Burning CDs is very different and does not put pressure on the mm.
-- Jens Axboe
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