Jack O'Quin wrote: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.
Ok to try and answer my own possibility I remounted reiserfs with the nolog option and tested with SCHED_ISO
********************************************* Timeout Count . . . . . . . . :( 0) XRUN Count . . . . . . . . . : 0 Delay Count (>spare time) . . : 1 Delay Count (>1000 usecs) . . : 0 Delay Maximum . . . . . . . . : 6750 usecs Cycle Maximum . . . . . . . . : 717 usecs Average DSP Load. . . . . . . : 30.7 % Average CPU System Load . . . : 5.7 % Average CPU User Load . . . . : 23.2 % Average CPU Nice Load . . . . : 0.0 % Average CPU I/O Wait Load . . : 0.0 % Average CPU IRQ Load . . . . : 0.6 % Average CPU Soft-IRQ Load . . : 0.0 % Average Interrupt Rate . . . : 1683.8 /sec Average Context-Switch Rate . : 20015.8 /sec *********************************************
You'll see on http://ck.kolivas.org/patches/SCHED_ISO/iso2-benchmarks/jack_test3-iso2-40c-nolog.png
That the 20s periodic thing delay has all but gone. Just one towards the end (no idea what that was).
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