>> ------------------------------ ------------- ------------- >> RT-V0.7.51-13 RT-V0.7.49-01 >> ------------------------------ ------------- ------------- > >> Delay Maximum . . . . . . . . : 333 295 usecs >> Cycle Maximum . . . . . . . . : 970 943 usecs >> Average DSP Load. . . . . . . : 45.7 44.4 % >> Average CPU System Load . . . : 15.6 16.3 % >> Average CPU User Load . . . . : 32.0 30.1 % > > i'm wondering - is this slight increase in CPU utilization (and > latencies) due to natural fluctuations, or is it a genuine overhead > increase? > I'm pretty confortable in saying that both results are almost equivalent, the slight differences probably due to environmental effects. All tests were conducted from a regular user konsole screen, under KDE 3.3 and perfectly functional X.org desktop session. Runlevel 5 with network down however. Oh, gkrellm is also on screen :) OTOH, I'll take this chance to show you something that is annoying me for quite some time. Just look to the attached chart where I've marked the spot with an arrow and a question mark. Its just one example of a strange behavior/phenomenon while running the jack_test4.2 test on PREEMPT_RT kernels: the CPU usage, which stays normally around 50%, suddenly jumps to 60% steady, starting at random points in time but always some time after the test has been started. Note that this randomness surely adds to the the slight differences found on the above results. First suspicions gone to cpu frequency/throttling, but I have it disabled on every kernel I build. Denormals? Don't think so, as jack_test_client is specially coded to treat floats as zero if below 1E-6. Any hints? -- rncbc aka Rui Nuno Capela [email protected]
Attachment:
jack_test4-2.6.12-RT-V0.7.51-13.0-200507080917.png
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