On Wed, 20 Oct 2004, vanDongen/Gilcher wrote:
On Tuesday 19 October 2004 07:40, Frank Barknecht wrote:
Whooho, 64 already is *very* small. I never heard of anybody run jack with 32. That's almost hard-realtime!
Several people are running jack with -p8 or -p16 using the latest realtime-preempt patches on linux 2.6.9
Just want to add that this "feature" depends primarily on the soundcard. Mine (SBLive) for example has a minimum of -p512.
If ALSA says it cannot set periodsize, then it can't, unless you change your soundcard hardware. And then there is the minimum latency implied by pd. Going beyond 64 does not make sense with pd. Sound I/O with pd is based on 64 bit chunks.
Guenter
I can run -p16 without xruns on 2.6.9-rc4-mm1 as long as I don't use disc-access, that's even without ingo's latest harder realtime patches. (Of course if I don't do anything, no apps, no X, just start jackd, I can go to -p8. But that is really pointless, but neat.) I'll try the latest patches and do the latency-limbo, how low can you go.
The downside is that periodsizes that small are less efficient for synthesis, so the same thing takes more cpu and you hit your performance ceiling sooner In a way it is useless to go that low, but it does mean that the entire system is more robust, so bigger periods will perform better as well.
ciao
Gerard
Ciao
-- electronic & acoustic musics-- http://www.xs4all.nl/~gml
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