[alsa-devel] [PATCH] ALSA - HDA - Add period time constraint to hda-intel

Raymond Yau superquad.vortex2 at gmail.com
Thu Jun 23 03:14:57 CEST 2011

2011/5/26 Takashi Iwai <tiwai at suse.de>:
> At Thu, 26 May 2011 10:01:14 +0800,
> Yeah, this was overlooked.  The patch below fixes both issues.
> Also it checks no_period_wakeup flag just to be sure (although setting
> this for normal read/write/drain operations doesn't make sense).

Since aplay does not support no period wakeup mode

I can only confirm that your patch fix the read/write and drain when
aplay using maximum period size/time of HDA codec (e.g. 11 seconds
period time for 44100Hz when prealloc is 4096)

Not sure whether  pulseaudio server still use maximum buffer size or not

but in pulsecore/sink.c and pulsecore/source.c


CPU usage jump from 2% to 12% when using

aplay -Dpulse --period-time=500 --buffer-time=1500 /usr/share/sounds/alsa/*.wav

although the sound is still good but PA server generate a huge amount
of messages

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