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

[Con Kolivas]

Jack O'Quin wrote:
> Con Kolivas <kernel@xxxxxxxxxxx> writes:

> Does it degrade significantly with a compile running in the background?

Check results below.

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

More pretty pictures with compile load on SCHED_ISO put up there now.

> Outstanding.  
>
> How do you get rid of that checkerboard grey background in the graphs?

Funny; that's the script you sent me so... beats me?

> Looking at the graphs, your system has a substantial 4 to 6 msec delay
> on approximately 40 second intervals, regardless of which scheduling
> class or how many clients you run.  I'm guessing this is a recurring
> long code path in the kernel and not a scheduling artifact at all.

Probably. No matter what I do the hard drive seems to keep trying to 
spin down. Might be related.

in the background:
while true ; do make clean && make ; done

SCHED_ISO with 40 clients:
*********************************************
Timeout Count . . . . . . . . :(    0)
XRUN Count  . . . . . . . . . :     3
Delay Count (>spare time) . . :    20
Delay Count (>1000 usecs) . . :     0
Delay Maximum . . . . . . . . :  5841   usecs
Cycle Maximum . . . . . . . . :   891   usecs
Average DSP Load. . . . . . . :    34.1 %
Average CPU System Load . . . :    10.7 %
Average CPU User Load . . . . :    87.8 %
Average CPU Nice Load . . . . :     0.0 %
Average CPU I/O Wait Load . . :     0.7 %
Average CPU IRQ Load  . . . . :     0.8 %
Average CPU Soft-IRQ Load . . :     0.0 %
Average Interrupt Rate  . . . :  1711.4 /sec
Average Context-Switch Rate . : 20751.6 /sec
*********************************************

Cheers,
Con
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