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edirol ua-25 alsa and jack midi latency test

Mar 14th, 2017
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  1. ALSA results:
  2. ./alsa-midi-latency-test -R -o 24:0 -i 24:0
  3.  
  4. > latency distribution:
  5. ...
  6. 2.6 - 2.7 ms: 1 #
  7. ...
  8. 2.8 - 2.9 ms: 10 #
  9. 2.9 - 3.0 ms: 1661 ##########
  10. 3.0 - 3.1 ms: 8028 ##################################################
  11. 3.1 - 3.2 ms: 295 ##
  12. 3.2 - 3.3 ms: 2 #
  13. 3.3 - 3.4 ms: 3 #
  14.  
  15. > SUCCESS
  16.  
  17. best latency was 2.6 ms
  18. worst latency was 3.3 ms, which is great.
  19.  
  20. Jack results:
  21. ./jack_midi_latency -i "a2j:UA-25 [24] (capture): UA-25 MIDI 1" -o "a2j:UA-25 [24] (playback): UA-25 MIDI 1"
  22.  
  23. JACK settings: samplerate: 44100, samples/period: 128
  24. probable nominal jack latency: 256 [samples] = 5.80 [ms]
  25. TOTAL: 10000 MIDI events sent+received.
  26. min= 363 max= 673 range= 310 avg= 389.3 dev= 12.79 [samples]
  27. min= 8.23 max= 15.26 range= 7.03 avg= 8.8 dev= 0.29 [ms]
  28.  
  29. 0.00 .. 7.99 [ms]: 0
  30. 7.99 .. 8.11 [ms]: 0
  31. 8.11 .. 8.23 [ms]: 358 ##########
  32. 8.23 .. 8.35 [ms]: 986 ############################
  33. 8.35 .. 8.47 [ms]: 963 ###########################
  34. 8.47 .. 8.59 [ms]: 1721 ##################################################
  35. 8.59 .. 8.71 [ms]: 1078 ###############################
  36. 8.71 .. 8.83 [ms]: 1168 #################################
  37. 8.83 .. 8.95 [ms]: 1154 #################################
  38. 8.95 .. 9.07 [ms]: 1388 ########################################
  39. 9.07 .. 9.19 [ms]: 1055 ##############################
  40. 9.19 .. 9.31 [ms]: 125 ###
  41. 9.31 .. 9.43 [ms]: 1 #
  42. 9.43 .. 9.55 [ms]: 0
  43. 9.55 .. inf [ms]: 2 #
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