I seemed to have found the solution for this by accident. While looking for information about this problem I stumbled across a post about the Rt-Linux project. They mentioned that disk access will override real-time scheduled processes. So I tuned my hard disks (with hdparm) to optimal speed and have not had one underrun or overrun in 2 days.
On 1/5/02 7:01 PM, "Daniel Hazelbaker" <[EMAIL PROTECTED]> wrote: > Hello, > > I have been using ALSA 0.5.x for 4 months now with a Delta1010. My box > is a Redhat 7.1 Linux, 2.4.12 kernel; AMD Duron 850Mhz, 256MB ram. I run > X-Windows with VNC viewer to work with a windows NT based audio mixer. The > only other thing the box does is work with the sound card. > > I Wrote a simple program which has two threads. > Thread #1) Run in a tight loop based on poll() which checks the sound card > to see if data is ready to be read or written. If data is ready it calls a > function which writes as much data as possible form a pre-filled pool to the > card. If we run out of data in the pool we write zero's instead. We read a > chunk of data if it is available from the sound card and put it in an > outgoing pool if there is room, if there isn't it is discarded. > > Thread #2) Run in a tight loop based on poll() which checks pipes for > availability of data to be read/written. These pipes are what fills and > pulls from the pools referred to in thread #1. > > Here is the problem. With no CPU load on the system and the sound card > program running at -19 nice (have tried 0 nice and +19 nice as well, and > various combinations in between), I get EPIPE errors for both playback and > capture for no reason whatsoever. I can have the CPU pegged grepping files, > searching for files, transfering files, etc. and it goes smooth. But with > 3% cpu it will just randomly "blip" and EPIPE. There seems to be no rhyme > or reason to these errors. I can not re-create them by doing anything. They > just happen. Any help or ideas of what I can do would be helpful. If > having the source code would be helpful I can attach it in another e-mail. > (the program total is about 25K) > > Daniel Hazelbaker > High Desert Church > > > > _______________________________________________ > Alsa-user mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/alsa-user > _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
