If I look at those png's locally (with gimp or gqview) they have a dark grey checkerboard background. If I look at them on the web (with galeon), the background is white. Go figure. Maybe the file has no background? I dunno.
Yes there's no background so it depends on what you look at it with. Gene already pointed out the checkered background in gimp :)
I was misreading the x-axis. They're actually every 20 sec. My system isn't doing that.
Possibly reiserfs journal related. That has larger non-preemptible code sections.
You're really getting hammered with those periodic 6 msec delays, though. The basic audio cycle is only 1.45 msec.
As you've already pointed out, though, they occur even with SCHED_FIFO so I'm certain it's an artefact unrelated to cpu scheduling.
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