[linux-audio-user] Re: [Jackit-devel] 2.6.10

Hi, As posted before on LKML, here goes my contained jackd test-suite (see attached tarball, jackd_test3.2.tar.gz). The provided shell script, can be issued from the command line as: ./jack_test3_run.sh [secs] [clients] [ports] [period] where: secs - number of seconds to run jackd workload (default = 300) clients - number of test-clients to run (default = 20) ports - number of interface ports per client (default = 4) period - number of frames per buffer (default = 64) Each test client (jack_test3_client) registers the same number of input and output ports (default is 4ins x 4outs), where each output is the audio mix of all inputs. The jack_test_run.sh script sets this jackd maximum port limit number as it sees fit, so any number of clients is allowed, provided there's enough CPU and/or RAM ;) Each test run produces a kernel-timestamped log filename with the complete captured stdout/err. Consolidated results can be produced by feeding several of those logfiles into the jack_test3_consolidated.awk script, just like this: cat *.log | awk -f jack_test3_consolidated.awk Additionally, if gnuplot is available, a graphical log chart is written as a PNG output file, for your eyes pleasure. You can (re)generate any chart for any log filename (and only one), by issuing the following script command line: ./jack_test3_plot.sh <logfilename> Now, let's get to the point. With the default workload (20 clients * 4 * 4 ports) I've ran it against a Con Kolivas' 2.6.10-cko1 patched kernel and the real jewel as is latest 2.6.10-rc3-mm1-RT-V0.7.33-04, which is Ingo Molnar's full PREEMPT_RT patched kernel. The tests were conducted on my P4(a)2.5G laptop, against the on-board alsa driver (snd-ali5451). The jackd command line is therefore: jackd -v -R -P60 -dalsa -dhw:0 -r44100 -p64 -n2 -S -P The results speak for themselves :) 2.6.10-cko1 RT-V0.7.33-04 ------------- ------------- Timeout Rate . . . . . . . . : ( 0.0) ( 0.0) /hour XRUN Rate . . . . . . . . . . : 216.8 2.2 /hour Delay Rate (>spare time) . . : 395.2 0.0 /hour Delay Rate (>1000 usecs) . . : 375.8 0.0 /hour Delay Maximum . . . . . . . . : 4320 308 usecs Cycle Maximum . . . . . . . . : 845 1051 usecs Average DSP Load. . . . . . . : 44.0 50.2 % Average CPU System Load . . . : 14.4 31.7 % Average CPU User Load . . . . : 19.8 21.4 % Average CPU Nice Load . . . . : 0.0 0.0 % Average CPU I/O Wait Load . . : 0.1 0.1 % Average CPU IRQ Load . . . . : 0.0 0.0 % Average CPU Soft-IRQ Load . . : 0.0 0.0 % Average Interrupt Rate . . . : 1691.7 1692.6 /sec Average Context-Switch Rate . : 13368.8 18213.9 /sec So, bottom-line goes like this: even though vanilla is getting a little more tasty, Ingo's RT patch performance beats it up by orders of magnitune. Nuff said. ;) -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org