[LAU] Realtime, but many xruns when jack is started. Debian Etch
porl sheean
porl42 at gmail.com
Mon Oct 8 03:13:02 EDT 2007
if it were me, and the only problem left is one irq priority setting, i
would add a chrt line in the startup options manually (after rtirq). that
way you aren't messing with anything else.
porl
On 08/10/2007, Nigel Henry <cave.dnb at tiscali.fr> wrote:
>
> On Sunday 07 October 2007 17:37, Rui Nuno Capela wrote:
> > 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.
> >
> > 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.
>
>
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