[LAU] IRQ and RT question

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To: Linux-audio-user <linux-audio-user@...>
Date: Thursday, December 6, 2012 - 4:49 pm

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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,
AKJ

--
Aaron Krister Johnson
http://www.akjmusic.com
http://www.untwelve.org

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Hi all,
I posted this as a followup=
to an earlier thread, but I think the traffic buried it. I was eager and c=
urious 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 la=
tency audio...doing less /proc/interrupts shows that there's a lot of s=
haring, like the audio and video card being on the same IRQ. Indeed, runnin=
g Csound FLTK gui interfaces and moving them while processing the csound or=
chestra 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 E=
EE, there is still suboptimal USB Irq settings to contend with.
I've always suspected I=
RQ settings, which are unfortunately hard-wired in laptops, to be profoundl=
y influential in RT performance, but I wanted the audio guru programmers to=
comment.=C2=A0

Thanks,AKJ=
-- Aaron Krister Johnsonhttp://www.akjmusic.com
http://www.untwelve.o=
rg

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Messages in current thread:
[LAU] IRQ and RT question, Aaron Krister Johnson, (Thu Dec 6, 4:49 pm)
Re: [LAU] IRQ and RT question, Jeremy Jongepier, (Fri Dec 7, 9:53 am)
Re: [LAU] IRQ and RT question, Len Ovens, (Thu Dec 6, 10:19 pm)