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SubjectRe: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling
Con Kolivas wrote:
> This is version 2 of the SCHED_ISO patch with the yield bug fixed and
> code cleanups.

...answering on this thread to consolidate the two branches of the email
thread.

Here are my results with SCHED_ISO v2 on a pentium-M 1.7Ghz (all
powersaving features off):

SCHED_NORMAL:
awk: ./jack_test3_summary.awk:67: (FILENAME=- FNR=862) fatal: division
by zero attempted
Well we wont bother looking at those results then. there were 38 XRUNS
that did make it on the parsed output.


SCHED_FIFO:
*********************************************
Timeout Count . . . . . . . . :( 0)
XRUN Count . . . . . . . . . : 4
Delay Count (>spare time) . . : 18
Delay Count (>1000 usecs) . . : 0
Delay Maximum . . . . . . . . : 6595 usecs
Cycle Maximum . . . . . . . . : 368 usecs
Average DSP Load. . . . . . . : 17.9 %
Average CPU System Load . . . : 3.4 %
Average CPU User Load . . . . : 13.7 %
Average CPU Nice Load . . . . : 0.0 %
Average CPU I/O Wait Load . . : 1.4 %
Average CPU IRQ Load . . . . : 0.6 %
Average CPU Soft-IRQ Load . . : 0.0 %
Average Interrupt Rate . . . : 1697.0 /sec
Average Context-Switch Rate . : 13334.1 /sec
*********************************************

SCHED_ISO (iso_cpu 70):
*********************************************
Timeout Count . . . . . . . . :( 0)
XRUN Count . . . . . . . . . : 5
Delay Count (>spare time) . . : 18
Delay Count (>1000 usecs) . . : 0
Delay Maximum . . . . . . . . : 6489 usecs
Cycle Maximum . . . . . . . . : 405 usecs
Average DSP Load. . . . . . . : 18.0 %
Average CPU System Load . . . : 3.3 %
Average CPU User Load . . . . : 13.7 %
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 . . . : 1700.2 /sec
Average Context-Switch Rate . : 12457.2 /sec
*********************************************

Increasing iso_cpu did not change the results.

At least in my testing on my hardware, v2 is working as advertised. I
need results from more hardware configurations to know if priority
support is worth adding or not.

Cheers,
Con
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