Hi Tom,
There is an issue with ALSA and cpu frequency scaling... Supposedly when
the cpu upclocks (i.e. 600 Mhz -> 900 Mhz), ALSA can experince slight audio
pauses.
I find running this on my eeePC can help those a bit:
for freq_mod in `lsmod | cut -d" " -f1 | grep freq`; do sudo rmmod
$freq_mod; done
It basically removes all of the cpu freq scaling modules from the kernel
(this will cause your machine to run at full clock speed, get hot, use
battery faster, etc).
Cheers,
-G
On Thu, Jul 3, 2008 at 2:25 AM, Tom Jennings <[EMAIL PROTECTED]> wrote:
> 2) I've been unable for some time to reduce latency to anything really
> useful; the best I could achieve was 49mS (!); less than that got the
> usual pops and gapping. Turning waveform to simple helped somewhat.
> This, on a machine designed for low-latency music (dual core 2.4GHz, 4GB
> of very fast RAM, etc).
>
> Poking around on a related problem found a thread involving RT latency
> and cpufreqd. So at a mere whim I apt-get purge'd it, and install cpudyn
> instead. Voila! I could run latency down to 2 (two!) mS with occasional
> pops; 4mS no pops (but read on). With waveform on, two tracks mixing
> centered fader, etc.
>
> Before I posted I figured I'd do some regression, so I purge'd cpudyn,
> reinstalled cpufreqd, expecting... still works at 4mS. So much for that
> theory. I assume that soemthing like a bad install/upgrade/etc crossed
> up the daemon, and now I'll never know.
>
> --> If you can't drop latency on a fast machine, try
> purging/reinstalling cpufreqd and/or cpudyn. There does seem to be some
> issue with frequency scaling in Hardy.
>
--
__
--- == __/ t.O ==--
http://stacktrace.org/
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