[LAU] Is ALSA using hrtimer?

[Paul Davis]

On Sat, Jun 5, 2010 at 2:07 PM, Ken Restivo <ken at restivo.org> wrote:
>> The issue is not using ALSA MIDI. Its routing from JACK to ALSA MIDI. If
>> this is not designed and implemented correctly, it can end up with large
>> amounts of jitter (variable delays in how long it takes to actually deliver
>> MIDI data to its destination). a2jmidid (at least relatively recent
>> versions) is correctly designed and implemented in this respect.
>>
>
> Really? It's probably been a couple years since I used a2jmidid, but I recall it having horrible jitter and latency (when using AZR3, which I used to use a lot) compared to the -Xseq option in jackd.

"at least relatively recent versions"

i rewrote the core of a2jmidid sometime earlier this year (or possibly
toward the end of last year). ironically, both of the 1-way clients
(a2j and j2a) were correctly designed and implemented, but a2jmidid
had been written in a different style. no more.


>
> -ken
>