Re: MIDI playback not keeping steady time with recent kernels

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Arthur Marsh wrote, on 05/02/11 17:30:
> Hi, I've had problems lately with recent kernels 2.6.37 and later, but
> haven't been able to pinpoint a specific change with git-bisect.
>
> MIDI playback either through xmms or aplaymidi won't keep regular time,
> sounding weird going faster and slower under any kind of system load
> except when nothing else is running.
>
> My alsa-info.sh results are at
>
> http://www.alsa-project.org
> /db/?f=e6a1108957098461ebbca54cc342f616b03b12df
>
> Has anyone experienced this kind of problem?
>
> Arthur.

Earlier, Takashi Iwai suggested:

Well, it implies that hrtimer is broken on your hardware.

Just add a module option timer_limit=3 to snd-timer, i.e. adding a file
containing below to /etc/modprobe.d/*.

    options snd-timer timer_limit=3


so I modified my /etc/modprobe.d/sound.conf to include:

"options snd-timer timer_limit=3" as below:

alias snd-card-0 snd-emu10k1
options snd-emu10k1 index=0
options snd-timer timer_limit=3

The problem still appears to be persisting, so I might try:

options snd-timer timer_limit=2

Arthur.



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