7 Oct
2007
7 Oct
'07
3:12 p.m.
On Sunday 07 October 2007 17:37, Rui Nuno Capela wrote:
Nigel Henry wrote:
Unfortunately that option is a no go, as I've got about 14 distros that run on
this machine, and don't want to mess with the placement of the cards, just in
case.
On Friday 05 October 2007 18:14, Nigel Henry
wrote:
you can switch pci slots around, that is between the tvcard and the
audigy2 on the mainboard On Thursday 04 October 2007 21:29, Roman Muñoz
wrote:
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. 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.
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
That's not ideal either, as it's better for me that snd-emu10k1 is indexed as
0. snd-bt87x is already notorious for grabbing card0, along with some other
uncooperative drivers, and as I don't need audio capture from the TV card, I
could send it to /bin/true, along with ohci1394, as.
install snd-bt87x /bin/true
install ohci1394 /bin/true
That still leaves bttv0 though, and as it is using /dev/video0, I cannot set
an indexing option for it.
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 ;)
As I've had so many problems getting realtime setup, I think I'll go for the
rtirq script hack, and will probably learn a bit more on how the script
works.
cheers
btw: Running /etc/rc.d/init.d/rtirq status on Fedora 7 shows IRQ-10 sharing
the stuff from IRQ-9 above, with emu10k1, and I'm getting xruns about every
6m 25secs with jackd started.
/etc/rc.d/init.d/rtirq status
PID CLS RTPRIO NI PRI %CPU STAT COMMAND
890 FF 80 - 120 0.0 S< IRQ-8 rtc0
920 FF 75 - 115 0.1 S< IRQ-10 ohci1394, bttv0, Bt87x audio,
EMU10K1
60 FF 70 - 110 0.0 S< IRQ-11 acpi, uhci_hcd:usb1,
uhci_hcd:usb2, eth0
285 FF 65 - 105 0.0 S< IRQ-1 i8042
284 FF 64 - 104 0.0 S< IRQ-12 i8042
5 FF 50 - 90 0.0 S< softirq-high/0
6 FF 50 - 90 0.3 S< softirq-timer/0
7 FF 50 - 90 0.0 S< softirq-net-tx/
8 FF 50 - 90 0.0 S< softirq-net-rx/
9 FF 50 - 90 0.0 S< softirq-block/0
10 FF 50 - 90 0.0 S< softirq-tasklet
11 FF 50 - 90 0.0 S< softirq-sched/0
12 FF 50 - 90 0.0 S< softirq-hrtimer
13 FF 50 - 90 0.0 S< softirq-rcu/0
324 FF 50 - 90 0.0 S< IRQ-14 libata
325 FF 50 - 90 0.0 S< IRQ-15 libata
674 FF 50 - 90 0.0 S< IRQ-6 floppy
895 FF 50 - 90 0.0 S< IRQ-7 parport0
The TV card using bttv has been very hit and miss on which IRQ is used. On
some distros it is IRQ-10, on others IRQ-9. A bit confusing, but once set up
it appears to use the same IRQ everytime on the different distros.
Thanks for your reply Rui.
Nigel.