On Mar 12, Anssi Saari wrote: > I have a performance problem writing audio discs at 16x in Linux. Cdrecord > 1.11a17 can just barely keep its fifo filled during the burn, mostly. Data > burns are not a problem, 12x audio burns are also not a problem, or > it seems I have barely enough horsepower to manage that, but burning > from mp3s with on the fly decoding again has performance problems. Same > problem happens when burning video-CDs with cdrdao 1.1.5, 12x fine, 16x > problems. Top doesn't show any application taking very much CPU. > > Burning in Windows 98SE with cdrecord 1.11a12 and Nero 5.5 is ok, even > decoding mp3 on the fly and burning at 16x. > > System is Duron 800, MSI K7T Turbo-R motherboard (VIA KT133A), writer > is LG GCE-8160B, Linux is Debian Testing, kernel 2.4.19-pre2-ac2 at the > moment, I've tried 2.4.16 and 2.4.17 as well, with and without preemptive > and ide-patches, doesn't matter. Two HD's, one on primary master, the > other on the on board Promise 20265 "raid". Doesn't matter which HD I > burn from, chipset support is on for both controllers in kernel. Writer > is secondary master with a Toshiba CDROM as slave, but I dont't burn from > that. DMA is on for all drives. Turning it off causes further slowdown. > > I've heard from someone else with the same writer with the same problem, > although he says he can't burn audio faster than 4x without problems. > > Output from a burn follows (cdrecord dev=0,0,0 speed=16 -dummy -v 01*wav). > > Any ideas?
Try increasing the fifo size to 16m or so (-fs=16m). You may also want to see if you can find a firmware upgrade for the CD-R drive. Also running cdrecord at nice --19 (i.e., -19, not +19) or so will help. You have to do that as root, though. I can simultaneously burn three different images to three CD-R drives on a Athlon 750 (w/KA133 chipset) [the trick is to make sure none are on the same bus... one's IDE, one's SCSI, and one's on 1394] with 2.4.19-pre2-ac1+preempt, so it's not a kernel issue. Hope this helps some... Chris -- Chris Lawrence <[EMAIL PROTECTED]> - http://www.lordsutch.com/chris/ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
