Re: [LAU] Issue with the priority of the sound cards using rtirq

The config of the Ubuntu Studio Precise kernel 3.2.0-23-lowlatency,
seems to be ready to use it with threadirqs as boot option.
Anyway, I still get
$ /etc/init.d/rtirq status

  PID CLS RTPRIO NI PRI %CPU STAT COMMAND
   92 FF 90 - 130 0.0 S irq/8-rtc0
   85 FF 85 - 125 0.0 S irq/18-ohci_hcd
   89 FF 84 - 124 0.0 S irq/18-ohci_hcd
  611 FF 83 - 123 0.0 S irq/18-snd_hdsp
1285 FF 82 - 122 0.8 S irq/18-nvidia
  652 FF 80 - 120 0.0 S irq/20-snd_ice1
  656 FF 80 - 120 0.0 S irq/21-snd_ice1

instead the of the wanted

$ /etc/init.d/rtirq status

  PID CLS RTPRIO NI PRI %CPU STAT COMMAND
  384 FF 90 - 130 0.0 S irq/8-rtc0
1102 FF 85 - 125 0.0 S irq/18-hdspm
1123 FF 80 - 120 0.0 S irq/20-ICE1712
1135 FF 80 - 120 0.0 S irq/21-ICE1712

So for the moment I guess it's better instead of using
$ grep RTIRQ_NAME_LIST /etc/default/rtirq
RTIRQ_NAME_LIST="rtc hdspm snd usb i8042"
which does the trick for other installs, to use
$ grep RTIRQ_NAME_LIST /etc/default/rtirq
RTIRQ_NAME_LIST="rtc snd usb i8042"
since this results in
$ /etc/init.d/rtirq status

  PID CLS RTPRIO NI PRI %CPU STAT COMMAND
   92 FF 90 - 130 0.0 S irq/8-rtc0
  702 FF 85 - 125 0.0 S irq/20-snd_ice1
  724 FF 85 - 125 0.0 S irq/21-snd_ice1
  717 FF 83 - 123 0.0 S irq/18-snd_hdsp
 1348 FF 82 - 122 0.8 S irq/18-nvidia
   78 FF 80 - 120 0.0 S irq/19-ehci_hcd
   80 FF 80 - 120 0.3 S irq/16-ohci_hcd
   82 FF 79 - 119 0.0 S irq/17-ohci_hcd
   84 FF 78 - 118 0.0 S irq/18-ohci_hcd
   87 FF 78 - 118 0.0 S irq/17-ohci_hcd
   89 FF 77 - 117 0.0 S irq/18-ohci_hcd
   91 FF 75 - 115 0.0 S irq/1-i8042
   20 FF 50 - 90 0.0 S irq/9-acpi
   67 FF 50 - 90 0.2 S irq/22-ahci
  279 FF 50 - 90 0.0 S irq/14-pata_ati
  280 FF 50 - 90 0.0 S irq/15-pata_ati
  292 FF 50 - 90 0.0 S irq/22-firewire
  561 FF 50 - 90 0.0 S irq/7-parport0
 1020 FF 50 - 90 0.0 S irq/43-eth0
    3 TS - 0 19 0.2 S ksoftirqd/0
    9 TS - 0 19 0.2 S ksoftirqd/1
so my MIDI interfaces snd_ice1... get a higher priority than the audio
card snd_hdsp..., but at least all the other stuff get a lower priority.

On other installs I also got/get the wanted priority for a non-rt, with
threadirqs, e.g.:
spinymouse@email-addr-hidden:~$ uname -a
Linux avlinux 3.0.23-avl-7-pae #28 SMP PREEMPT Thu Mar 1 19:14:14 EST
2012 i686 GNU/Linux
spinymouse@email-addr-hidden:~$ /etc/init.d/rtirq status

  PID CLS RTPRIO NI PRI %CPU STAT COMMAND
  452 FF 90 - 130 0.0 S irq/8-rtc0
 1028 FF 85 - 125 0.0 S irq/18-hdspm
 1040 FF 80 - 120 0.0 S irq/20-ICE1712
 1042 FF 80 - 120 0.0 S irq/21-ICE1712
  615 FF 75 - 115 0.0 S irq/19-ehci_hcd
  620 FF 75 - 115 0.2 S irq/16-ohci_hcd
  622 FF 74 - 114 0.0 S irq/17-ohci_hcd
  626 FF 73 - 113 0.0 S irq/17-ohci_hcd
  445 FF 70 - 110 0.0 S irq/1-i8042
   96 FF 50 - 90 0.0 S irq/9-acpi
  621 FF 50 - 90 0.1 S irq/22-firewire
  625 FF 50 - 90 0.0 S irq/18-ohci_hcd
  627 FF 50 - 90 0.0 S irq/18-ohci_hcd
  628 FF 50 - 90 0.0 S irq/14-pata_ati
  629 FF 50 - 90 0.0 S irq/15-pata_ati
  634 FF 50 - 90 0.3 S irq/22-ahci
  909 FF 50 - 90 0.0 S irq/7-parport0
 1414 FF 50 - 90 0.0 S irq/43-eth0
    3 TS - 0 19 0.0 S ksoftirqd/0
    9 TS - 0 19 0.0 S ksoftirqd/1

Could it be the kernel version or video driver?

Any hints are welcome,
Ralf

PS: I did not test if it really does matter if the audio card has a
higher or lower priority than the MIDI cards.

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Received on Mon Apr 30 00:15:02 2012