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All the machines you have tried except one are sub 1GHz. And the 1.1GHz machine you were using is a Duron processor which is the low end of the low end! In our documentation we specify a machine with a clock speed of 1GHz or better. The DSP routines in chan_usbradio/XPMR may be getting bogged down for an instant during the fork or ethernet packet transmission of the statpost info. We have not had much luck running ACID on machines under 1GHz and we have not tested it on Celeron or Duron processors.
There are lots of users out there using ACID, but I suspect if you ask them, they are running processors north of 1GHz and that most of them are running later vintage processors from Intel and AMD.
If you want to continue using old motherboards with slower clock speeds and old low end processors, then you have to expect these kinds of issues.
Steve WA6ZFT
Hi Steve, I have choppiness problems, too, as I've mentioned in threads in the past. I hacked chan_usbaudio.c slightly -and- turned OFF RADIO_RELAX and have radically improved results--almost no chop at all...I haven't encountered the statpost issue since I'm not sending out updates yet. I also had ugly timer issues with my fastest box. Going to a 2.6.30.5 kernel and the hi-res timer and patching zaptel/kernel/ztdummy.c fixed this. I'm running recent boxes--one is a Athlon64X2 4400+, a second is an A64X2 6000+. They're both MSI motherboards. One is ATI chipset, the other is NVIDIA. I've also used slower (Single core 32bit Athlon 2800+, VIA chipset) machines in the past with the same exact problems. And, all the boards have different network adapters. I'm even running 3ware RAID 1 on one of the boxes. ...Note also that I'm running MANY of these boxes (well over 100!) in production using linux at my company--several even running the asterisk PBX software...Never any problems at all. Also, if I use various linux utilities to read/write the CM108 audio device directly, I've not had any dropped/chopped audio. I realize this is a different scenario from how audio is handled by asterisk, but, it leads me to believe that there isn't any systemic problem with my linux/hardware/USB config. Thanks in advance! 73, David kb4fxc
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