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    SubjectRe: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling
    Jack O'Quin wrote:
    > Con Kolivas <kernel@kolivas.org> writes:
    >
    >
    >>Con Kolivas wrote:
    >>
    >>Here are my results with SCHED_ISO v2 on a pentium-M 1.7Ghz (all
    >>powersaving features off):
    >>
    >>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.
    >
    >
    > Excellent. Judging by the DSP Load, your machine seems to run almost
    > twice as fast as my 1.5GHz Athlon (surprising). You might want to try

    Not really surprising; the 2Mb cache makes this a damn fine cpu, if not
    necessarily across the board :)

    > pushing it a bit harder by running more clients (2nd parameter,
    > default is 20).

    Ask and ye shall receive.

    > Are you getting fairly consistent results running SCHED_ISO
    > repeatedly? That worked better for me after I fixed that bug in JACK
    > 0.99.47, but I think there is still more variance than with
    > SCHED_FIFO.

    Much more consistent, and I believe some bugs in the earlier
    implementation were probably biting.

    40 clients:
    SCHED_FIFO:
    *********************************************
    Timeout Count . . . . . . . . :( 0)
    XRUN Count . . . . . . . . . : 7
    Delay Count (>spare time) . . : 20
    Delay Count (>1000 usecs) . . : 0
    Delay Maximum . . . . . . . . : 6739 usecs
    Cycle Maximum . . . . . . . . : 746 usecs
    Average DSP Load. . . . . . . : 30.4 %
    Average CPU System Load . . . : 5.7 %
    Average CPU User Load . . . . : 23.3 %
    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 . . . : 1692.0 /sec
    Average Context-Switch Rate . : 20907.7 /sec
    *********************************************

    SCHED_ISO:
    *********************************************
    Timeout Count . . . . . . . . :( 0)
    XRUN Count . . . . . . . . . : 11
    Delay Count (>spare time) . . : 19
    Delay Count (>1000 usecs) . . : 0
    Delay Maximum . . . . . . . . : 8723 usecs
    Cycle Maximum . . . . . . . . : 714 usecs
    Average DSP Load. . . . . . . : 31.1 %
    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 . . . : 1685.4 /sec
    Average Context-Switch Rate . : 20496.9 /sec
    *********************************************

    Full results and pretty pictures available here:
    http://ck.kolivas.org/patches/SCHED_ISO/iso2-benchmarks/

    Cheers,
    Con
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