[PlanetCCRMA] Too many xruns w/Delta 66 on F7
Paul Coccoli
pcoccoli at gmail.com
Wed Dec 26 10:16:01 2007
Hi all,
I've been running Planet CCRMA for years and have generally been happy
with it. Since moving to Fedora 7, however, I can't get my jack
latency settings as low as I'd like. I get periodic xruns (without
any jack apps running) at anything below 1024 frames and 2 periods.
The hardware is an Athlon 1800, 1G RAM, with a M-Audio Delta 66. Same
hardware I've had for years, and I could swear I had better
performance with FC5 (and FC2, and RH9).
I've looked at everything I can think of:
I've got the latest Planet kernel:
paul@boon ~]$ uname -r
2.6.22.6-1.rt9.5.fc7.ccrmart
I bumped the PCI latency timer up on the ICE1712 chip (the Delta):
00:0a.0 Multimedia audio controller: VIA Technologies Inc. ICE1712 [Envy24] PCI
Multi-Channel I/O Controller (rev 02)
Subsystem: VIA Technologies Inc. M-Audio Delta 66
Flags: bus master, medium devsel, latency 248, IRQ 20
IRQ stuff looks fine to me (audio on IRQ 20):
[paul@boon ~]$ cat /proc/interrupts
CPU0
0: 272253996 IO-APIC-edge timer
1: 2 IO-APIC-edge i8042
6: 6 IO-APIC-edge floppy
7: 0 IO-APIC-edge parport0
8: 0 IO-APIC-edge rtc0
9: 0 IO-APIC-fasteoi acpi
12: 4 IO-APIC-edge i8042
14: 893299 IO-APIC-edge libata
15: 5410951 IO-APIC-edge libata
16: 1602810 IO-APIC-fasteoi uhci_hcd:usb1, uhci_hcd:usb2,
uhci_hcd:usb3, ehci_hcd:usb4
18: 2 IO-APIC-fasteoi ohci1394
19: 1374546 IO-APIC-fasteoi eth0
20: 3078836 IO-APIC-fasteoi ICE1712
NMI: 0
LOC: 319262183
ERR: 0
MIS: 0
The only IRQ with a higher priority is the RTC on 8 (seems sensible):
[paul@boon ~]$ ps -e -o pid,cmd,pri | grep IRQ
61 [IRQ-9] 90
304 [IRQ-12] 104
305 [IRQ-1] 105
322 [IRQ-16] 110
345 [IRQ-14] 90
346 [IRQ-15] 90
673 [IRQ-6] 90
910 [IRQ-8] 120
942 [IRQ-18] 90
948 [IRQ-7] 90
1034 [IRQ-20] 115
1498 [IRQ-19] 90
Jackd priority looks right (I assume the 100 is the watchdog, 90 is
the audio thread?):
[paul@boon ~]$ ps -mo pid,cmd,pri -C jackd
PID CMD PRI
31851 jackd -R -P50 -dalsa -dhw:0 -
- - 19
- - 19
- - 19
- - 100
- - 90
QJackctl is using this:
[paul@boon ~]$ cat .jackdrc
jackd -R -P50 -dalsa -dhw:0 -r44100 -p256 -n2
And yet, xruns:
21:40:37.506 Startup script...
21:40:37.512 artsshell -q terminate
JACK tmpdir identified as [/dev/shm]
21:40:37.877 Startup script terminated with exit status=256.
21:40:37.879 JACK is starting...
21:40:37.884 jackd -R -P50 -dalsa -dhw:0 -r44100 -p256 -n2
21:40:37.903 JACK was started with PID=32405 (0x7e95).
jackd 0.103.0
Copyright 2001-2005 Paul Davis and others.
jackd comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK compiled with System V SHM support.
loading driver ..
Enhanced3DNow! detected
apparent rate = 44100
creating alsa driver ... hw:0|hw:0|256|2|44100|0|0|nomon|swmeter|-|32bit
control device hw:0
configuring for 44100Hz, period = 256 frames, buffer = 2 periods
ALSA: final selected sample format for capture: 32bit little-endian
ALSA: use 2 periods for capture
ALSA: final selected sample format for playback: 32bit little-endian
ALSA: use 2 periods for playback
21:40:40.166 Server configuration saved to "/home/paul/.jackdrc".
21:40:40.168 Statistics reset.
21:40:40.169 Client activated.
21:40:40.171 Audio connection change.
21:40:40.199 Audio connection graph change.
JACK tmpdir identified as [/dev/shm]
Enhanced3DNow! detected
21:40:40.374 Audio active patchbay scan...
21:41:11.971 XRUN callback (1).
delay of 11622.000 usecs exceeds estimated spare time of 5619.000; restart ...
**** alsa_pcm: xrun of at least 0.054 msecs
21:41:21.684 XRUN callback (2).
Any help would be appreciated. What have I missed?