Re: [LAD] ALSA MIDI latency test results are far away from reality | Linuxaudio.org

Re: [LAD] ALSA MIDI latency test results are far away from reality

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From: Niels Mayer <nielsmayer@...>

To: Ralf Mardorf <ralf.mardorf@...>

Cc: Linux-Audio-Dev <linux-audio-dev@...>

Subject: Re: [LAD] ALSA MIDI latency test results are far away from reality

Date: Thursday, July 15, 2010 - 5:07 pm

On Wed, Jul 14, 2010 at 6:23 AM, Ralf Mardorf
wrote:

quoted text

> For the MIDI audio test's LXDE session I'm running GNOME terminal tab 1
> JACK2, tab 2 Qtractor. Evolution offline + this Email opened for writing
> to the lists. Envy24 Control and nothing else.
>
> For Qtractor I switched from queue timer (resolution) 'system timer
> (1000 Hz)' to 'HR timer (1000000000 Hz)' and restarted Qtractor.

For your prior failures, are you sure you had the correct soundcard
setup as the MIDI queue timer?
This caused me some issues in the past:
http://old.nabble.com/the-defacto-host-for-lv2-tt28789821.html#a28793953

Now my Qtractor View->Options->MIDI->Playback-Queue Timer is
permanently set to HR timer which avoids such issues when switching
soundcards.

You may want to check this setting prior to running tests... I also
found this thread helpful w/r/t explaining timer issues in MIDI:
http://old.nabble.com/Is-ALSA-using-hrtimer--ts28699922.html

-- Niels
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Messages in current thread:

[LAD] ALSA MIDI latency test results are far away from reality, Ralf Mardorf, (Wed Jul 14, 1:23 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Niels Mayer, (Thu Jul 15, 5:07 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Robin Gareus, (Wed Jul 14, 7:46 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 8:32 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 8:16 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 8:24 pm)

[LAD] Tests directly routing pc's midi-in to midi-out (was: ..., Arnout Engelen, (Wed Jul 14, 5:56 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 6:09 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Clemens Ladisch, (Thu Jul 15, 6:26 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 8:41 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Arnout Engelen, (Thu Jul 15, 9:48 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 10:18 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Clemens Ladisch, (Thu Jul 15, 10:55 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 11:08 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Robin Gareus, (Thu Jul 15, 11:45 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Clemens Ladisch, (Thu Jul 15, 2:31 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 12:45 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Robin Gareus, (Thu Jul 15, 1:36 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 10:49 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Arnout Engelen, (Wed Jul 14, 7:37 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 9:21 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 9:29 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., , (Wed Jul 14, 9:43 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 9:55 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Arnout Engelen, (Thu Jul 15, 6:23 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., , (Wed Jul 14, 10:46 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 11:46 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., , (Thu Jul 15, 8:07 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 11:15 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Arnold Krille, (Thu Jul 15, 7:57 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Fri Jul 16, 9:26 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Arnold Krille, (Fri Jul 16, 9:47 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Robin Gareus, (Fri Jul 16, 11:26 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Fri Jul 16, 11:30 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Fri Jul 16, 10:06 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., drew Roberts, (Fri Jul 16, 11:02 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Fri Jul 16, 11:23 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Arnold Krille, (Fri Jul 16, 10:19 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Fri Jul 16, 10:46 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Fri Jul 16, 10:50 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., , (Thu Jul 15, 7:57 am)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Clemens Ladisch, (Wed Jul 14, 1:52 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 3:11 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Paul Davis, (Wed Jul 14, 2:53 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 3:21 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 3:24 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 3:27 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Robin Gareus, (Wed Jul 14, 3:40 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Robin Gareus, (Wed Jul 14, 1:45 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 2:22 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Robin Gareus, (Wed Jul 14, 3:31 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 5:58 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Robin Gareus, (Wed Jul 14, 7:43 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 8:08 pm)