[LAU] irq sharing

Philipp Überbacher hollunder at lavabit.com
Tue Aug 24 12:21:23 UTC 2010


Excerpts from David Santamauro's message of 2010-08-24 14:10:12 +0200:
> 
> Hi,
> 
> I've decided to get back to diagnosing why my delta 1010 inputs have a
> background noise and stumbled across a few websites indicating that the
> problem could be irq sharing.
> 
> My delta shares irq 20 with usb devices:
> 
> $ cat /proc/interrupts |grep ICE
>   20:    1325915    1326971    1335010    1348560    1337725
> 1330100    1336582    1346152   IO-APIC-fasteoi   ehci_hcd:usb1,
> uhci_hcd:usb2, ICE1712
> 
> Is there a way to forcibly assign ICE1712 to another IRQ? I just want
> to test the theory.
> 
> thanks
> 
> David

A few BIOSes allow that, plugging it into another slot might help as
well. I'm not sure there is a software way to do it. I'm not sure
whether the rtirq script does something like that or just changes
priorities.
-- 
Philipp

--
"Wir stehen selbst enttäuscht und sehn betroffen / Den Vorhang zu
und alle Fragen offen." Bertolt Brecht, Der gute Mensch von Sezuan



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