On 11/27/2012 12:38 PM, Ralf Mardorf wrote:
On Tue, 2012-11-27 at 11:40 +0100, Jeremy Jongepier wrote:
Software like Qtractor can use it too when the module is loaded. Is
this recommended? Does it improve MIDI timing for instance? How does
it compare to the default timer setting?
If you use hardware MIDI the different PCM timers or
hr timer can improve jitter or sync between audio and MIDI or whatever,
at least it results in different drift for MIDI and audio, if you record
e.g. one MIDI channel after the other using hardware MIDI.
What do you mean by hardware MIDI? External synths? So when only using
soft synths using snd-hrtimer doesn't make any difference at all?
Usually system timer (default) is the best way to go,
hr timer is better, but can cause issues,
What kind of issues?
PCM timer should be less good,
but there could be some voodoo when using it, that could improve things.
If you don't use hardware MIDI don't care about it and use default,
resp. system timer.
This is what I experienced. Sometimes people fall out a plane when
flying very high, without a parachute and they survive. There's no
rational explanation.
"Default" is default for good reasons, to have other options can help,
but if you don't have issues, there's no reason to care about those
optional timers.
For me there's another reason, it's not about personal use. I just want
to know how this timer stuff actually works so that I can update the
timers section on the linuxmusicians.com Wiki in such a way that it
makes sense. It's now a bit jibber jabber because I actually have no
real clue how all these different timers affect the Linux audio experience.
Regards,
Jeremy
Regards,
Ralf
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