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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Issue of CPU usage with HiFiBerry driver snd_soc_hifiberry_amp with Debian Wheezy kernel 3.12.28"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84585#c85">Comment # 85</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Issue of CPU usage with HiFiBerry driver snd_soc_hifiberry_amp with Debian Wheezy kernel 3.12.28"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84585">bug 84585</a>
from <span class="vcard"><a class="email" href="mailto:superquad.vortex2@gmail.com" title="Raymond <superquad.vortex2@gmail.com>"> <span class="fn">Raymond</span></a>
</span></b>
<pre>does aplay work with non power 2 period size ?
aplay -v -D hw:0,0 --buffer-size=4408 stereo.wav
1.102| 0.000) D: [pulseaudio] alsa-util.c: Trying hw:0 with
SND_PCM_NO_AUTO_FORMAT ...
( 1.106| 0.003) D: [pulseaudio] alsa-util.c: Managed to open hw:0
( 1.107| 0.001) D: [pulseaudio] alsa-util.c: Maximum hw buffer size is 2972
ms
( 1.108| 0.001) D: [pulseaudio] alsa-util.c: Set buffer size first (to 4408
samples), period size second (to 1102 samples).
( 1.109| 0.001) I: [pulseaudio] alsa-sink.c: Successfully opened device
hw:0.
( 1.110| 0.000) I: [pulseaudio] alsa-sink.c: Selected mapping 'Analog
Stereo' (analog-stereo).
( 1.110| 0.000) I: [pulseaudio] alsa-sink.c: Device doesn't support mmap(),
falling back to UNIX read/write mode.
( 1.110| 0.000) I: [pulseaudio] alsa-sink.c: Cannot enable timer-based
scheduling, falling back to sound IRQ scheduling.
( 1.112| 0.001) I: [pulseaudio] alsa-util.c: Successfully attached to mixer
'hw:0'
it is strange that mmap is not supported
it is no easy to find a fragment time which can be converted to power two
period size</pre>
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