1 Jun
2004
1 Jun
'04
10:38 p.m.
Malcolm Baldridge wrote:
Thanks to you and everyone else responding to my latest laments. And
thanks for the offer to help. Before filling up your Inbox with
diagnostic info, I thought I would try out a few things. I have been
using the 2.4.23 kernel with only the low-latency patch - I was
following the suggestions I've seen on various audio websites. I found
what I think is the LCK1 patch set you mention here
(http://www.plumlocosoft.com/kernel/) and it certainly looks
interesting. I think I'll try it out before using up more of everyone's
time.
So, am I
completely hosed with my Adaptec SCSI drive setup? Anybody
have any insight into these Adaptec controllers? I've fussed with the
setpci latency_timer settings (from Jan Depner's "Installing and
configuring ALSA, JACK, & Ardour..." web site), but still see long
xruns.
If you could email the output from lspci -v and procinfo, that would be great.
Also, which exact kernel setup are you using? Preemptible?
Preempt+low-latency? Con Kolivas' "LCK1" patches which combine O(1)
scheduler, and two sets of low-latency patches, including patches to the I/O
subsystem?
Also, which filesystems are you using for your audio
data drive? If you're
using ext3, which journalling mode? data=writeback seems to provide alot
better latency than the default data=ordered. Reiserfs seems to solve alot
of problems as well, if you're willing to reformat your audio drive. It's
easier to change your ext3 journalling mode (no reformat is necessary).
I'm using ext3 with data=writeback, based on your suggestion from a few
days ago. Unfortunately, that hasn't seemed to help.
What kind of SCSI drives are you using?
=R=
I'm using 4 Seagate SX118273LC (18G) drives in a software RAID-1, mostly
because I wanted to see what putting together a RAID was like (and at
the time I bought them, the drives were relatively cheap).
From suggestions in other posts in this thresad, I think I'll try
kludging in an IDE drive first, just to test the IDE vs. SCSI option
first. If that really solves the problem, I guess I'll bite the bullet
and re-arrange my drives.
Thanks again!
Joel