Re: [LAU] priorities of interrupts or other fixes

From: Jeremy <jeremy@email-addr-hidden>
Date: Mon Mar 08 2010 - 22:17:29 EET

Atte André Jensen wrote:
> Jeremy wrote:
>
>> jeremy@email-addr-hidden:~$ cat /proc/interrupts | grep ohci1394
>> 16: 1123463 1075232 IO-APIC-fasteoi uhci_hcd:usb3, ohci1394,
>> eth1, mmc0, jmb38x_ms:slot0, nvidia
>>
>> IRQ 16 in my case. In your case also according to your opening mail. You
>> can see that it's crowded on 16 in my case, I can't get my Firewire to
>> work without the help of rtirq.
>
> That's great, thanks. Can't believe I overlooked that!
>
> I'm also on irq 16, it seems, and only sharing with one usb port:
> atte@email-addr-hidden:~$ cat /proc/interrupts | grep ohci1394
> 16: 110664 111091 IO-APIC-fasteoi uhci_hcd:usb3, ohci1394
>
> Two questions:
>
> 1) Why doesn't `pidof IRQ-16` return anything here, I guess I need that
> to call chrt, right:
>
> atte@email-addr-hidden:~$ pidof IRQ-16
> atte@email-addr-hidden:~$ pidof IRQ 16
> atte@email-addr-hidden:~$ pidof "IRQ 16"
> atte@email-addr-hidden:~$ pidof "IRQ-16"
> atte@email-addr-hidden:~$
>

Try ps -eLo pid,cmd | grep "irq/16"
But it might be a good idea to use the rtirq script:
http://subversion.ffado.org/wiki/IrqPriorities
http://alsa.opensrc.org/Rtirq

> 2) I'm hoping the usb shared with my firewire is one of the three usb
> ports, how can I investigate further in this direction? Ultimately I'd
> like to be able to leave whatever-usb-is-sharing-irq-with-the-firewire
> unused...
>

Yes it's port 3. You can investigate further with the lsusb command.

Best,

Jeremy
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Received on Tue Mar 9 00:15:04 2010

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