Re: [LAU] Is ALSA using hrtimer?

Hi,

On Friday, May 28, 2010, Niels Mayer wrote:
> I added your suggestion to
> https://bugzilla.redhat.com/show_bug.cgi?id=597354#c5 which resolves
> the coredump in drumstick-sysinfo
>
> ///////// ///////// ///////// /////////
> Upstream author Pedro Lopez-Cabanillas suggested doing
> 'sudo modprobe snd-hrtimer'
> prior to running Jackd.
>
> Now drumstick-sysinfo doesn't crash. Furthermore, it looks like ALSA is
> using the HRTimer:

The proper fix for the crash in drumstick-sysinfo will be included in the
upcoming Drumstick-0.3.2, when published. The fix shall only avoid the abort
signal and the crash, showing to the user a less alarming error message
instead.

The root cause is the ALSA module snd-hrtimer not loaded, when the hardware
providing the HPET timer is available, and it is used by Jack. Loading the
ALSA module fixes the crash and allows the ALSA sequencer applications to
access this high precission timer.

In my opinion, if you run some ALSA sequencer applications with a modern
Linux/ALSA and your motherboard provides the HPET, the module snd-hrtimer
should be loaded. It is the alternative to the RTC timer present in older
machines.

Regards,
Pedro
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Received on Sat May 29 04:15:01 2010