fc2, xorg, 2.6.x, scheduling latency peaks

Arjan van de Ven arjanv at redhat.com
Fri May 28 05:58:43 UTC 2004

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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