Red Hat Bugzilla – Bug 31565
Last modified: 2007-04-18 12:32:08 EDT
I'm seeing a problem with poor performance
on SCSI drives. IDE drives take about 15 minutes
to do an "everything" install from HDD. The same
install on the same computer except using a SCSI
HDD takes about 40 minutes.
When I try hdparm -t /dev/hda I get between 16 MB/sec
for laptop drives to 25 MB/sec for EIDE 100 drives. The same test
with 15K rpm SCSI 3 Seagate Cheetah drives produces 5 MB/sec.
The qa0314 and later trees are known to have this issue solved (the default
queue depth in the RC2 release was 1 and that severly limited performance,
upping the queue depth to 32 has helped tremendously).