Re: [Jack-Devel] Call for testing of MIDI Drivers in JACK 2
I've made tests with jack2 jackdbus from svn trunk r4317. I've tested
the alsarawmidi backend along with the alsa audio driver. My jackdbus
settings:
<parameter path="/engine/driver">alsa</parameter>
<parameter path="/engine/realtime">true</parameter>
<parameter path="/engine/realtime-priority">70</parameter>
<parameter path="/engine/sync">true</parameter>
<parameter path="/engine/slave-drivers">alsarawmidi</parameter>
<parameter path="/driver/device">hw:0</parameter>
<parameter path="/driver/rate">48000</parameter>
<parameter path="/driver/period">128</parameter>
<parameter path="/driver/nperiods">2</parameter>
<parameter path="/driver/hwmon">false</parameter>
<parameter path="/driver/hwmeter">false</parameter>
<parameter path="/driver/duplex">true</parameter>
<parameter path="/driver/softmode">false</parameter>
<parameter path="/driver/monitor">false</parameter>
<parameter path="/driver/dither">n</parameter>
<parameter path="/driver/inchannels">2</parameter>
<parameter path="/driver/outchannels">2</parameter>
<parameter path="/driver/shorts">false</parameter>
The kernel I used is 2.6.33.7-rt29 with irq threads at default
priorities (not tweaked).
My hardware is a PCI emu10k1 card (SB Live! 5.1 Dell OEM [SB0228]).
I have a 4 core Phenom II CPU.
jack_midi_latency_test -m 3 -s 8192 -t 3 "system:1-1 EMU10K1 MPU-401 (UART) 1 out" "system:1-1 EMU10K1 MPU-401 (UART) 1 in"
---------------------
Reported out-port latency: 2.67-2.67 ms (128-128 frames)
Reported in-port latency: 2.67-2.67 ms (128-128 frames)
Average latency: 6.26 ms (300.52 frames)
Lowest latency: 5.75 ms (276 frames)
Highest latency: 6.87 ms (330 frames)
Peak MIDI jitter: 1.12 ms (54 frames)
Average MIDI jitter: 0.25 ms (11.64 frames)
Jitter Plot:
0.0 - 0.1 ms: 1665
0.1 - 0.2 ms: 1654
0.2 - 0.3 ms: 1392
0.3 - 0.4 ms: 1776
0.4 - 0.5 ms: 1591
0.5 - 0.6 ms: 113
0.6 - 0.7 ms: 1
Latency Plot:
5.7 - 5.8 ms: 276
5.8 - 5.9 ms: 915
5.9 - 6.0 ms: 906
6.0 - 6.1 ms: 688
6.1 - 6.2 ms: 862
6.2 - 6.3 ms: 807
6.3 - 6.4 ms: 823
6.4 - 6.5 ms: 828
6.5 - 6.6 ms: 682
6.6 - 6.7 ms: 852
6.7 - 6.8 ms: 547
6.8 - 6.9 ms: 6
Messages sent: 8192
Messages received: 8192
---------------------
I'd be happy if jack_midi_latency_test had an option for disabling the
autoconnect behaviour. Instead, the test could be started when both
ports are connected. What do you think about this idea?
--
Nedko Arnaudov <GnuPG KeyID: 7862B9E45D1B58ED>
1303080124.23336_0.ltw:2,a <87r590ttha.fsf at nuntu dot spacelabs dot org>