Nigel Henry wrote: > On Friday 05 October 2007 18:14, Nigel Henry wrote: >> On Thursday 04 October 2007 21:29, Roman Muñoz wrote: >>> Hi Nigel, >>> >>> Is rtirq working four you? If yes, I think that your soundcard IRQ >>> should be at prio 85 at startup... and it was not. >>> >>> See this: >>> http://mggmail.blogspot.com/2007/07/re-rtirq-fixed.html >> Well I've got realtime working ok on Debian Etch, and Rick Wright's one >> liner in rc.local is changing the prio to 90 for the soundcard on bootup. >> But, rtirq is something different. The version installed is the same as on >> the blog above (20070101), and the 2 files are installed, one >> in /etc/init.d/rtirq, and the other in /etc/sysconfig/rtirq. I believe >> the /etc/sysconfig directory was created when installing rtirq, as I don't >> rmember it being there before. I say this because with Fedora the sysconfig >> directory exists, and there is a bunch of files in it, and I remember >> looking in Debian for this directory, and couldn't find it. >> >> I also ran sysv-rc-conf as root on Etch. The rtirq entry is there, but >> runlevels 2,3,4,and5 are unchecked, so something isn't quite right here. I >> see also on the blog above that rtirq should be in /etc/default, but in the >> case of Etch it isn't. As I say. Realtime on Etch is working ok, but I'll >> go through the same procedure on Debian Lenny (testing), and try and fix >> the rtirq problem without using Rick Wright's one liner, although it's much >> appreciated, and works like clockwork. >> >> I'll post back after I've played around with realtime on Lenny a bit. >> >>> Best regards, >>> Roman >> Thanks for all the replies to this interesting subject. >> >> Nigel. > > As promised, an update on realtime on Debian Lenny. That is after having > installed from the musix repo, kernel 2.6.21-rt4, and 2.6.21.5-rt18. > > First I had to update util-linux from the unstable repo, as the version on > Lenny was the Etch one, and still thought that schedutils was available. The > Sid (unstable) version installed ok, and chrt is available now. > > Then added the lines below to /etc/security/limits.conf. > @audio - rtprio 99 > @audio - nice -10 > @audio - memlock 4000000 > > Now the fun started with installing rtirq (the version from the musix repo). > It installed, but refused to start. I was confused, as both scripts, the one > in /etc/init.d, and /etc/sysconfig seemed to be the same, so I booted up > Fedora 7, and checked the 2 rtirq scripts there, and sure enough the one > in /etc/sysconfig was a very short one, compared to the start script > in /etc/init.d. > > Downloaded the rtirq tarball from the blog that Roman posted. > http://www.rncbc.org/jack/rtirq-20070101.tar.gz > > Unpacked it, deleted the duplicated startup script in Lenny's /etc/sysconfig, > pasted the correct config script in /etc/sysconfig, renaming it from > rtirq.conf to rtirq. > > Rebooted, and ran /etc/init.d/rtirq status, and got the following output. > > /etc/init.d/rtirq status > > PID CLS RTPRIO NI PRI %CPU STAT COMMAND > 184 FF 90 - 130 0.0 S< IRQ-8 rtc > 666 FF 85 - 125 0.0 S< IRQ-9 ohci1394, bttv0, Bt87x audio > 1770 FF 84 - 124 0.1 S< IRQ-10 EMU10K1 > 631 FF 80 - 120 0.0 S< IRQ-11 uhci_hcd:usb1, uhci_hcd:usb2, > eth0 > 288 FF 75 - 115 0.0 S< IRQ-1 i8042 > 287 FF 74 - 114 0.0 S< IRQ-12 i8042 > 4 FF 50 - 90 0.0 S softirq-high/0 > 5 FF 50 - 90 0.0 S softirq-timer/0 > 6 FF 50 - 90 0.0 S softirq-net-tx/ > 7 FF 50 - 90 0.0 S softirq-net-rx/ > 8 FF 50 - 90 0.0 S softirq-block/0 > 9 FF 50 - 90 0.0 S softirq-tasklet > 10 FF 50 - 90 0.0 S softirq-sched/0 > 11 FF 50 - 90 0.0 S softirq-hrtimer > 12 FF 50 - 90 0.0 S softirq-rcu/0 > 207 FF 50 - 90 3.2 S< IRQ-14 ide0 > 210 FF 50 - 90 0.0 S< IRQ-15 ide1 > 785 FF 50 - 90 0.0 S< IRQ-6 floppy > 1581 FF 50 - 90 0.0 S< IRQ-7 parport0 > 3078 FF 50 - 90 0.0 S< IRQ-3 > > Jackd has a prio of 70, and just with jackd started, only one xrun up to now > after 58mins of 0.118 msecs duration. > > Job done. Realtime on Etch, and Lenny. The above makes it look dead easy, but > there was a lot of frustration along the way, and it took longer than it > appears. > > Many thanks to all those who offered help on this list, and the debian-user > list. > > One question regarding the rtirq status output above. > > IRQ-9 has a slightly higher rtprio than that for the soundcard on IRQ-10. > ohci1394 is tied in with the firewire port on the audigy2 soundblaster, but I > can probably stop that being loaded, as I don't use firewire. bttv0 is the TV > card, and BT87x audio is for the audio capture part of the TVcard. > > What would I need to do to swap these around, so that IRQ-9 has a prio of 84, > and IRQ-10, a prio of 85? > > It's probably a bit of an academic question, as your unlikely to be doing > serious audio work while watching TV. > you can switch pci slots around, that is between the tvcard and the audigy2 on the mainboard or you can tweak the alsa modules loading order, like opted in /etc/modprobe.conf (or the equivalent in your distro), giving an explicit options ... index= line for each module, for example, i believe these are the ones to write down: options snd-bt87x index=0 # tvcard options snd-emu10k1 index=1 # audigy or you can hack the rtirq script for doing priorities in reverse order: edit /etc/init.d/rtirq near line 211, where it reads IRQS=`grep irq /proc/asound/cards | tac | sed 's/.* irq \(.*\)/\1/'` change that line to: IRQS=`grep irq /proc/asound/cards | sed 's/.* irq \(.*\)/\1/'` however I recommend doing it the second way, that is making it all deterministic and independent from the booting order resolution, which might change when you less expect with the weather ;) cheers -- rncbc aka Rui Nuno Capela rncbc@xxxxxxxxx _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user
