[LAU] IRQ and RT question

Jeremy Jongepier jeremy at autostatic.com
Fri Dec 7 09:52:39 UTC 2012

On 12/06/2012 05:49 PM, Aaron Krister Johnson wrote:
> Hi all,
> I posted this as a followup to an earlier thread, but I think the traffic
> buried it. I was eager and curious to hear other's knowledge and experience:
> I have an EEEPC 1000HE netbook (used to run Arch but I got tired of having
> to compile, or failing to compile, some extra pacakges) that runs Xubuntu,
> usually with XFCE of course, but sometimes with Fluxbox. Also have a bigger
> laptop, and HP pavilion7, running Mint with Maya Desktop (I also switch it
> to Fluxbox sometimes).
> Anyway, it seems the EEE has suboptimal IRQ hardware settings for RT low
> latency audio...doing less /proc/interrupts shows that there's a lot of
> sharing, like the audio and video card being on the same IRQ. Indeed,
> running Csound FLTK gui interfaces and moving them while processing the
> csound orchestra sometimes makes pops and crackle dropouts, while the same
> thing on the better IRQ set HP Pavilion shows flawless performance.
> Even if I run an outboard USB audio interface (Lexicon Lambda) on the EEE,
> there is still suboptimal USB Irq settings to contend with.
> I've always suspected IRQ settings, which are unfortunately hard-wired in
> laptops, to be profoundly influential in RT performance, but I wanted the
> audio guru programmers to comment.
> Thanks,

What's the output of
cat /proc/interrupts


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