On Fri, 2004-05-28 at 02:39, Fernando Pablo Lopez-Lezcano wrote: > 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. can you disable preempt? That should improve latencies....
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