Arthur Marsh wrote: > Mel Gorman wrote, on 23/02/11 19:45: > > Unfortunately the original mail is a bit light on details on how this was > > reproduced and I didn't find a thread with more details. It looks like it's > > simply playing a midi file while the system is under load but less clear > > on what the symptoms are (audio skipping maybe?). The synthesizer hardware continues to generate sound even if the computer does not update its settings, it's just that the timings are off. Even a few milliseconds of jitter are audible. > > I'll start with using irqs-off tracer to see can I replicate > > a similar style of issue without depending on sound. > > Clemens, would this work to identify the problem without relying on a > device such as a sound card with a wavetable synthesiser or external > synthesiser receiving MIDI signals from the pc? Yes (assuming that it is indeed delayed interrupts that cause the slowdowns, but I see no other mechanism how memory compaction could affect the sequencer timer). Any other job with realtime constraints should be similarly affected, but the tracer measures the problem directly at its source. Regards, Clemens ------------------------------------------------------------------------------ Free Software Download: Index, Search & Analyze Logs and other IT data in Real-Time with Splunk. Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. http://p.sf.net/sfu/splunk-dev2dev _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
