On Sat, Jan 09, 2010 at 02:30:35PM -0500, Michal Seta wrote: > Hi all, > > Happy new decade! > > Back on that WiFi jamming issue I wrote about a while ago. Thank you > all for the various suggestions. I have spent most of my time trying > to get somewhere with netjack as I found it the most promising, not > only in terms of efficiency but also scripting and control. However, > I have hit some brick walls which are certainly due to the nature of > WiFi networks (packet collisions and such) which make my setup very > unstable. > > First of all, in my setup, there will be one "server" computer > collecting 5 signals from the 5 musicians and playing them for the > audience. Moreover, the operator (or software) will send back 5 mono > signals to performers (one signal per performer). The idea is that > each performer hears only one instrument at a time. > > Currently the show stopper lies in alsa_in and alsa_out components. > Whenever I run both on my netbook (Atom 1.6G with Atheros > Communications Inc. AR5001 Wireless Network Adapter (802.11g)) they > consume around 70-80%CPU and they peak at around 50% each whenever > they choke on net over/underruns. They eventually segfault (and > sometimes bring the jack server down with them. This particularly > true whenever the WiFi signal signal strength is weak (around 50-60%). you might want to use -q0 to reduce the quality of the resampler. however they will give you CPU spikes, with the current packet loss algorithm. because jack will run pretty fast, when it catches up after a period of sync loss. i am sorry that its not working so good currently. while trying to fix a different bug, i changed the packet loss behaviour, and its pretty useless for your case now. > I was especially surprised at the high CPU consumption of those apps, > as I figured that if all they do is schlep audio to and from the > soundcard they would keep a low profile... My built-in audio > interface is: no. they resample the audio they transfer. and libsrc can be quite heavy in high quality mode. > It is an Acer Aspire One netbook. Running Karmic with jack compiled > by hand, version 0.118.0 -- torben Hohn _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
