linuxaudio.org

On Sunday 07 October 2007 17:37, Rui Nuno Capela wrote:

quoted text
> 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

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.

quoted text
>

> 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.

quoted text
>

> 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 \(.*\)//'`

>

> change that line to:

>

>   IRQS=`grep irq /proc/asound/cards | sed 's/.* irq \(.*\)//'`

>

>

> 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.

quoted text
>

> 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.