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....