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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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