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

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
To: <linux-audio-user@...>
Date: Wednesday, May 2, 2012 - 7:19 am

On 05/01/12 20:32, Fernando Lopez-Lezcano wrote:

Afaik this is not true. The threadirqs kernel option (or a real-time
kernel) creates bottom halves (or tasklets, or softirqs) of each device
that has or shares an IRQ. So in Ralf's case four devices share IRQ 18,
two USB hubs, a soundcard and a graphics card. Each of those devices
gets its own specific softirq which then can get prioritized with rtirq
accordingly. Default rtprio is 50 afaik, so nvidia should get rtprio 50
and not 82.

> AFAIK it is not possible (or simple) to raise _just_ the soundcard as it

It is not arbitrary, the softirqs get specific names derived from the
loaded kernel module for that device iirc. So the graphics card gets a
label 18-nvidia, the soundcard 18-snd_hdsp and both usb hubs
18-ohci_usb. And it is those labels that rtirq uses to set the rtprio
for the different softirqs.

At least that is what I remember

More info:
http://wiki.linuxmusicians.com/doku.php?id=system_configuration#prioriti...

If that Wiki page contains errors, please let me know so I can correct
those.

Best,

Jeremy
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

Messages in current thread:
Re: [LAU] Issue with the priority of the sound cards using r..., Fernando Lopez-Lezcano, (Tue May 1, 6:32 pm)
Re: [LAU] Issue with the priority of the sound cards using r..., Jeremy Jongepier, (Wed May 2, 7:19 am)
Re: [LAU] Issue with the priority of the sound cards using r..., Fernando Lopez-Lezcano, (Thu May 3, 6:26 am)
Re: [LAU] Issue with the priority of the sound cards using r..., Fernando Lopez-Lezcano, (Thu May 3, 5:01 pm)
Re: [LAU] Issue with the priority of the sound cards using r..., Fernando Lopez-Lezcano, (Thu May 3, 11:39 pm)
Re: [LAU] new rtirq release, Fernando Lopez-Lezcano, (Fri May 4, 7:08 pm)
[LAU] rtirq question, Ivica Ico Bukvic, (Sat May 5, 2:42 am)
Re: [LAU] rtirq question, Ivica Ico Bukvic, (Sat May 5, 3:02 am)
Re: [LAU] new rtirq release, Rui Nuno Capela, (Fri May 4, 9:56 pm)
Re: [LAU] new rtirq release, Fernando Lopez-Lezcano, (Fri May 4, 11:14 pm)
Re: [LAU] new rtirq release, Rui Nuno Capela, (Fri May 4, 11:42 pm)
Re: [LAU] new rtirq release, Brendan Jones, (Fri May 4, 3:36 pm)
Re: [LAU] new rtirq release, Ralf Mardorf, (Fri May 4, 4:26 pm)
Re: [LAU] Issue with the priority of the sound cards using r..., Fernando Lopez-Lezcano, (Thu May 3, 8:23 pm)