Malcolm Baldridge wrote: >>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? > > 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. >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
