17 Jun
2004
17 Jun
'04
11 a.m.
One thing I am still looking to learn more about is how
to adjust
thread priorities and such to make sure that your threads are run often
enough (especially the disk thread), and how to decide how big your
disk buffers need to be.
4 years ago, Benno and I measured this and concluded that under some
circumstances it was possible to have a small-multi-second delay in
disk access. Ardour uses 5 second disk buffers. With buffers of this
size, the scheduling priority of the disk thread is not really relevant.
We also determined that 256kB seemed to be the optimal i/o block size
for ext2. Whether this is true for ext3/reiserfs/xfs and others i do
not know.
--p