from the jack(1)d man page:
-M, --midi-bufsize [ event-count ]
Specify the size of the buffer used for MIDI ports. Units are "MIDI events per process() cycle", where an event occupies up to 4 bytes (as most common MIDI events do). The default buffer size is 2048 bytes, which is
about 500 MIDI events. Typical values for event-count will range from 10 to about 1000. Be aware that using very high values along with a large number of ports may cause JACK to fail to start because of the amount
of memory that would be required.
Specify the size of the buffer used for MIDI ports. Units are "MIDI events per process() cycle", where an event occupies up to 4 bytes (as most common MIDI events do). The default buffer size is 2048 bytes, which is
about 500 MIDI events. Typical values for event-count will range from 10 to about 1000. Be aware that using very high values along with a large number of ports may cause JACK to fail to start because of the amount
of memory that would be required.
On Tue, Nov 3, 2020 at 10:57 AM Len Ovens <len@xxxxxxxxxxxxx> wrote:
On Tue, 3 Nov 2020, Christopher Arndt wrote:
> I made some tests and it seems that there is indeed a limit of 112 bytes
> for outgoing sysex data.
I knew there was a limit but had never run into it. I realize that the
longest sysex I had used were ~20 bytes (mackie control with LCD info sent
channel at a time)
The one question I do have is the buffer size (128/2 ?) and if you tested
at more than one buffer size. I would expect that the two would be tied
together. I also remember reading that there had been code developed for
jack (I do not remember if it was jack 1 or 2 specific) to allow long,
non-realtime sysex to be used. However, I do not remember if it was ever
included or how it was accessed.
--
Len Ovens
www.ovenwerks.net
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