[LAU] priorities of interrupts or other fixes

Jeremy jeremy at autostatic.com
Mon Mar 8 15:17:29 EST 2010

Atte André Jensen wrote:
> Jeremy wrote:
>> jeremy at soushi:~$ 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 at vestbjerg:~$ 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 at vestbjerg:~$ pidof IRQ-16
> atte at vestbjerg:~$ pidof IRQ 16
> atte at vestbjerg:~$ pidof "IRQ 16"
> atte at vestbjerg:~$ pidof "IRQ-16"
> atte at vestbjerg:~$

Try ps -eLo pid,cmd | grep "irq/16"
But it might be a good idea to use the rtirq script:

> 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.



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