>I'm not sure if this is a kernel-ide-disk issue or a raid issue, so I'm
>trying here first:
Its an audio issue :-)
>Works great... except for during heavy disk access my MythTV recordings
>will get somewhat glitchy audio. Stop the disk access and the audio
>returns to normal. Even with moderate disk access it's ok. It's just
>when it's heavy. And the glitches are usually every few seconds unless
>it's really heavy where the audio gets nearly unintelligible for 10 secs
>or so.
What does the audio do exactly? Popping, crackles, dropouts or...
Does MythTV report XRUNS? Using ALSA or OSS?
Can you increase audio buffer sizes in MythTV?
>Anything else I can try tuning to fix this nagging issue? Any ideas on
>what's biting me here?
You can try pci latency. Turn it way up for the audio device, way down for
everything else.
I use this at bootup (edited a bit so I hope I didn't break it :-)
# make default 16
latency=10 # hex
echo set default pci latency to 0x$latency
setpci -d *:* latency_timer=$latency # expects hex
# find multimedia devices
pcis=$(lspci -v | grep Multimedia | awk '{ print $1; }')
if test -z "$pcis"; then
echo WARNING: no multimedia devices found on pci bus
else
for p in $pcis; do
echo set latency timer for $p
setpci -s $p latency_timer=ff
done
fi
This reduced some audio pops for me but didn't eliminate them...
You can google for pci latency but basically it controls how long a device
holds the bus when another device requests it. If your disk controllers
don't let go soon enough then streaming devices lose.
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