[LAU] JACK MIDI latency -- was Re: Concerning schedtool

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To: <linux-audio-user@...>
Date: Saturday, April 19, 2014 - 5:48 pm

On 04/19/2014 06:18 PM, Ralf Mardorf wrote:

Indeed they're pretty close these days. That was not true last time I
measured it. a2jmidid still has a slight edge, here. Same latency as
alsarawmidi but less jitter.

jackd2 from git (ab409a65df).
measured with https://github.com/x42/jack_midi_latency
using a PreSonus 1818VSL on a thinkpad x60s. linux 3.2.35 SMP PREEMPT RT

======================

## jackd -S -dalsa -dhw:2 -r48000 -p64 -n2 -Xraw

JACK settings: samplerate: 48000, samples/period: 64
probable nominal jack latency: 128 [samples] = 2.67 [ms]
TOTAL: 10000 MIDI events sent+received.
min= 183 max= 209 range= 26 avg= 193.6 dev= 4.69 [samples]
min= 3.81 max= 4.35 range= 0.54 avg= 4.0 dev= 0.10 [ms]

0.00 .. 3.78 [ms]: 0
3.78 .. 3.80 [ms]: 2 #
3.80 .. 3.81 [ms]: 0
3.81 .. 3.83 [ms]: 13 #
3.83 .. 3.85 [ms]: 44 #
3.85 .. 3.86 [ms]: 127 #
3.86 .. 3.88 [ms]: 0
3.88 .. 3.89 [ms]: 142 #
3.89 .. 3.91 [ms]: 270 ##
3.91 .. 3.93 [ms]: 222 ##
3.93 .. 3.94 [ms]: 491 ####
3.94 .. 3.96 [ms]: 0
3.96 .. 3.98 [ms]: 4930 ###########################################
3.98 .. 3.99 [ms]: 263 ##
3.99 .. 4.01 [ms]: 174 #
4.01 .. 4.03 [ms]: 0
4.03 .. 4.04 [ms]: 159 #
4.04 .. 4.06 [ms]: 152 #
4.06 .. 4.07 [ms]: 612 ######
4.07 .. 4.09 [ms]: 200 ##
4.09 .. 4.11 [ms]: 0
4.11 .. 4.12 [ms]: 298 ###
4.12 .. 4.14 [ms]: 170 #
4.14 .. 4.16 [ms]: 188 #
4.16 .. 4.17 [ms]: 132 #
4.17 .. 4.19 [ms]: 0
4.19 .. 4.20 [ms]: 733 #######
4.20 .. 4.22 [ms]: 490 ####
4.22 .. 4.24 [ms]: 153 #
4.24 .. inf [ms]: 34 #

======================

## jackd -S -dalsa -dhw:2 -r48000 -p64 -n2
## a2jmidid -e

JACK settings: samplerate: 48000, samples/period: 64
probable nominal jack latency: 128 [samples] = 2.67 [ms]
TOTAL: 10000 MIDI events sent+received.
min= 184 max= 209 range= 25 avg= 193.0 dev= 4.09 [samples]
min= 3.83 max= 4.35 range= 0.52 avg= 4.0 dev= 0.09 [ms]

0.00 .. 3.80 [ms]: 0
3.80 .. 3.83 [ms]: 48 #
3.83 .. 3.85 [ms]: 73 #
3.85 .. 3.88 [ms]: 99 #
3.88 .. 3.91 [ms]: 131 #
3.91 .. 3.93 [ms]: 164 #
3.93 .. 3.96 [ms]: 6318 ############################################
3.96 .. 3.98 [ms]: 252 #
3.98 .. 4.01 [ms]: 174 #
4.01 .. 4.04 [ms]: 133 #
4.04 .. 4.06 [ms]: 906 #######
4.06 .. 4.09 [ms]: 223 #
4.09 .. 4.11 [ms]: 151 #
4.11 .. 4.14 [ms]: 96 #
4.14 .. 4.17 [ms]: 220 #
4.17 .. 4.19 [ms]: 623 ####
4.19 .. inf [ms]: 388 ###

======================

## jackd -S -dalsa -dhw:2 -r48000 -p64 -n2 -Xseq

interestingly has the lowest latency (one period less) but 3 times the
jitter.

JACK settings: samplerate: 48000, samples/period: 64
probable nominal jack latency: 128 [samples] = 2.67 [ms]
TOTAL: 10000 MIDI events sent+received.
min= 128 max= 179 range= 51 avg= 154.2 dev= 13.59 [samples]
min= 2.67 max= 3.73 range= 1.06 avg= 3.2 dev= 0.28 [ms]

0.00 .. 2.57 [ms]: 53 #
2.57 .. 2.69 [ms]: 542 ##############
2.69 .. 2.81 [ms]: 1834 ############################################
2.81 .. 2.93 [ms]: 1078 #############################
2.93 .. 3.05 [ms]: 764 ####################
3.05 .. 3.18 [ms]: 1750 #########################################
3.18 .. 3.30 [ms]: 887 ########################
3.30 .. 3.42 [ms]: 1164 ###############################
3.42 .. 3.54 [ms]: 1720 ########################################
3.54 .. 3.66 [ms]: 207 #####
3.66 .. 3.78 [ms]: 0
3.78 .. inf [ms]: 0

ciao,
robin
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Messages in current thread:
[LAU] Concerning schedtool, Jonathan E Brickman, (Sat Apr 19, 3:58 am)
Re: [LAU] Concerning schedtool, Jeremy Jongepier, (Sat Apr 19, 2:13 pm)
Re: [LAU] Concerning schedtool, Robin Gareus, (Sat Apr 19, 2:43 pm)
Re: [LAU] Concerning schedtool, Ralf Mardorf, (Sat Apr 19, 4:18 pm)
[LAU] JACK MIDI latency -- was Re: Concerning schedtool, Robin Gareus, (Sat Apr 19, 5:48 pm)
Re: [LAU] JACK MIDI latency -- was Re: Concerning schedtool, Jeremy Jongepier, (Sun Apr 20, 1:49 pm)
Re: [LAU] JACK MIDI latency -- was Re: Concerning schedtool, Jeremy Jongepier, (Sun Apr 20, 2:05 pm)
Re: [LAU] Concerning schedtool, Robin Gareus, (Sat Apr 19, 10:31 am)