17 Nov
2009
17 Nov
'09
4:53 a.m.
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Gary Morgan schrieb:
i see..... well, then i guess i have to question my
memlock or nice settings
again, dont I?
I do not think that this will help much...
My question now, would be: what are these settings
actually doing? memlock
seems to speak for itself, how much available mem is set for audio
purposes...right?
but I dont see the difference between rtprio and nice,
nice does not help much if working with audio expect for some very
special needs (such as: running the computer as a synth for a
live-performance maybe..) It only affects the normal load-balancing as
used on the average Linux-system. I never experienced any usable
improvement in performance with running jack or ardour with nice -10 or
so...
rtprio is the most important value. 99 is good (has always worked for
me) it allows group audio to wield the special preemption-magics that
are implemented with a rt-enabeled kernel.
I only know that
they handle interrupt priority in an indirect way. perhaps i've been setting
them incorrectly; for nice and rtprio, the lowest number = highest priority?
rtprio is higher number = higher prio
nice is reversed
Otherwise, I just don't see why each time i changed the settings, i would
get no difference. It makes sense that my cpu would be constantly running at
60% if I were to set memlock to 50 or 60%, but the xrun count was always
rediculous. and yes, tried restarts each time, for the jack server, and my
computer itself.
I suspect your audio-device as the weakest segment in your chain.
If you want to stick with it for now try to fiddle with the
jack-settings in qjackctl. Especially raising the number of
periods/buffer to 3 can do wonders with USB/FW or cheap onboard devices.
I also recommend to run jack with 48KHz or 96KHz - 44.1 does not perform
the same as good for me.
I run a cheapo-onboard chip with these settings:
/usr/bin/jackd -t1000 -u -dalsa -dhw:0 -r48000 -p512 -n3 -s -Xseq -zr
32ms latency is not really cool know but great performance does not come
at no-cost....
best regs
HZN
>
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