Re: [Jack-Devel] MIDI support for OpenBSD?

Hans Petter Selasky wrote:
> I've been using FreeBSD exclusivly for USB MIDI since v8.0, and the ping time
> on MIDI using a graphical userland application is less than 6 milliseconds for
> one command looped back. What timings are you seeing?

Almost nobody does direct measurements of the MIDI signal lines due to
the hardware required.  It's easier to measure ping times using a looped
back MIDI cable, which should give the same results, and there is a tool
for that:
<https://github.com/koppi/alsa-midi-latency-test>

All the reported benchmark results are below 6 ms.

(The primary purpose is not so much measuring the hardware but the
kernel's maximum scheduling delay.  The UM-2EX results were done on
a very optimized kernel.)

While this program uses the ALSA sequencer API at the moment, it doesn't
require any features that would prevent it to be ported to use raw MIDI.


Regards,
Clemens

1339661062.7692_0.ltw:2,a <4FD99AFC.3010202 at ladisch dot de>