Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.30-2

[Ingo Molnar]

* Rui Nuno Capela <rncbc@xxxxxxxxx> wrote:

> OK. I tried 14 instances of jack_test. I even modded Florian's
> original source code, to let each client instance have 4 ins and 4
> outs, and to make things a litle bit heavier, all 4 inputs are mixed
> into each of the 4 outputs.
> 
> Saw at least a couple of XRUNs in a 20 (4*5) minute test-run. CPU load
> doesn't get above 30% on my laptop (P4/UP 2.533Ghz).

the max CPU load i get here is 46% (your laptop is faster), but no
xruns. The result of a 5-minute run is:

 ************* SUMMARY RESULT ****************
 Timeout Count . . . . . . . . :(    0)
 XRUN Count  . . . . . . . . . :     0
 Delay Count (>spare time) . . :     0
 Delay Count (>1000 usecs) . . :     0
 Delay Maximum . . . . . . . . :     0   usecs
 Cycle Maximum . . . . . . . . :  1016   usecs
 Average DSP Load. . . . . . . :    46.4 %
 Average CPU System Load . . . :    40.5 %
 Average CPU User Load . . . . :     2.3 %
 Average CPU Nice Load . . . . :     0.0 %
 Average CPU I/O Wait Load . . :     0.0 %
 Average CPU IRQ Load  . . . . :     0.0 %
 Average CPU Soft-IRQ Load . . :     0.0 %
 Average Interrupt Rate  . . . :  2374.1 /sec
 Average Context-Switch Rate . : 19172.8 /sec

i suspect i need to activate some option/define in jackd to get some of
the more advanced stats such as delay-maximum?

the kernel i used was -30-6 and i used the snd-via82xx driver. (I had to
do -n3 instead of -n2 when starting up jackd - otherwise i'd get an
endless stream of very small xruns, apparently a via82xx driver bug?)

	Ingo
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