[linux-audio-dev] about MIDI timing...

[Clemens Ladisch]

Chris Cannam wrote:
> Clemens:
> > Most sound cards don't have an internal timer that could be used for
> > MIDI timing.  ALSA uses whatever timer is configured, the default for
> > this is the RTC timer.
> 
> It is?  For ALSA sequencer queues?  I thought the 
> default was system timer.

Since 1.0.11, the RTC timer is used, if available.

> Maybe it just depends on the modules you have loaded. 

Timer modules are loaded automatically.

> My impression from Rosegarden users' reports has 
> been that trying to use the ALSA sequencer with the 
> RTC timer (something I've never bothered with myself: 
> I always use a 1000Hz system timer) is a reliable way 
> to lock up your system completely, with most kernels 
> from about 2.6.13 or so onwards.

Kernels >= 2.6.15 work.  The configure script checks for older kernels.


HTH
Clemens