Hi, I am trying to get full duplex 4 channel I/O with minimum latency to work on a Digiram VXpocket 440, and I am having some problems. All log files and test scripts that I have been using are found under the link at the end of this mail:
1. If i turn on preemptive multitasking the log fills up with error messages about Bad scheduling and I cant get anything through the card. 2. ACPI seems to make the kernel more instable and more easy to crash. 3. If i pipe sound from arecord to aplay and use too small buffer size the kernel locks. I need buffer-space > 2048 bytes to avoid buffer over and under runs see atest.log and atest. aplay uses 50% of CPU. Kernel lockups occur when buffer-space is below 1024 bytes. 4. Using all four channels is only possible with S16_LE not S24_LE. 5. I have written an application which loop backs sound from jackds inputs to outputs. JACK never receives any samples however so nothing is played or recorded. See jtest and jtest.log When jack runs ksoftirqd used ~15 % of the CPU. 6. When trying to run jack and increasing buffer length to 1024 samples and above I get: jackd: pcm.c:5946: snd_pcm_mmap_commit: Assertion `frames <= snd_pcm_mmap_avail(pcm)' failed. I assume this is related to my asoundrc file. The device is a SBC with very limited resources so debugging is a bit hard for me. My application is demo system for a new type of hearing aid. I know a little bit about alsa and have previously helped you debug M-Audio delta 1010LT. Where do you suggest I start? I guess the problem is in the interrupt handling in the PCMCIA subsystem. This is the link for my logs and scripts: http://www.watri.org.au/~ajh/debug/ Thank you for your help, //Anders ------------------------------------------------------- This SF.Net email is sponsored by Sleepycat Software Learn developer strategies Cisco, Motorola, Ericsson & Lucent use to deliver higher performing products faster, at low TCO. http://www.sleepycat.com/telcomwpreg.php?From=osdnemail3 _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
