sigh. of course! because the kernel has no idea that your audio application needs to run with real-time priority, and is instead treating all apps as if they are normal interactive programs. if you tell the kernel that your app needs to run with RT priority (there are
So why I think about some api to tell the kernel that some app nedds CPU in more deterministic manner. Generally if we could do this by /proc too like tunnig ALSA for particular programs it would be good for old proprietary programs which we couldn't improve. It's not RT but some sheduler modification to treat some programs specially.
OSS cannot affect this in any way - its a function of the kernel scheduler and not the audio device API.
OK but we could have some kernel RT thread which is doing mixing or MIDI emulation.
Regards
The ideal scheduler for realtime apps would be one that has an api that allows for a call like "schedule me at exactly 10ms intervals+-1ms".
This would cause the scheduler to automatically juggle the other processes around so that at the exact time of the 10ms interval, our process gets CPU time. We would have to also configure +-ms so that the scheduler has some leaway to allow for some optimisations.
This api should be flexible enough to allow us to do the same, but using the sound card's hardware clock as the trigger.
The same again for the video card's clock/frame interrupt.
The current schedular gives every process X microseconds of CPU time or less (process calls nano_sleep() )
We should be able to get the schedular to give a process less CPU time if the next process to schedule is the realtime interval process.
Cheers James
------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
