What happened between 2.4.8 and 2.4.9 that the disk I/O performance would
*dramatically* drop? With 2.4.8 I'm getting ~34MB/s writes and ~160MB/s
reads. As of 2.4.9 this has dropped to ~10MB/s writes and 80-100MB/s
reads. That's pretty bad. The problem was not fixed with 2.4.10 and is
still the same as of 2.4.13pre6 - I haven't checked the latest in a couple
weeks, maybe it's better?
I've decided to drop back to 2.4.5 since 2.4.8 was regularly crashing the
machines, the "kernel: __alloc_pages: 3-order allocation failed." errors
seem to have gone away, and the performance is right up there.
Sloan Digital Sky Survey, Fermilab 630.840.6509
SDSS. Mapping the Universe.