On Thu, 2004-05-27 at 17:25, Fernando Pablo Lopez-Lezcano wrote: > Hi all. I'm trying to track the cause of high scheduling latency peaks > in FC2 that make the system unusable for low latency audio work. > > Test systems: PIV laptop, radeon video chipset, AMD64 desktop, radeon > video chipset. How I test: I run the Jack (Jack Audio Connection Kit) > sound server with 2 or 3 128 frame buffers for low latency operation > through the Qjackctl gui front-end. I then start GUI apps that use Jack > (for example Freqtweak, Hydrogen and Jamin). I see plenty of buffer > xruns of varying durations during the app load process and afterwards. More data I forgot to include: Jack is running with SCHED_FIFO priority. For achieving that I run a custom kernel (currently based on Arjan's 1.391) with preempt enabled and the realcap kernel module (by Jack O'Quin) added. I also run an up to date version of ALSA with full debugging enabled so that I can get kernel stack traces when xruns occur. -- Fernando
