Re: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling

From: Con Kolivas
Date: Thu Jan 20 2005 - 01:00:58 EST


Jack O'Quin wrote:
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.

Con
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