[pulseaudio-tickets] [Bug 84585] Issue of CPU usage with HiFiBerry driver snd_soc_hifiberry_amp with Debian Wheezy kernel 3.12.28

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84585

--- Comment #103 from Alessandro Ferri <alessandroferri_015 at fastwebnet.it> ---
(In reply to Raymond from comment #101)
> try
> 
> aplay -v -D hw:0,0 --dump-hwparams --period-time=10000 any44100hzstereo.wav
> 
> 
> you need to ask  Florian (author of bcm2835_i2s.c)
> 
> 1) .periods_min * .period_bytes_min or .buffer_bytes_min seem less than the
> size of fifo 
> 2) are there any timeout loop  which cause hwptr remain unchanged for more
> than 9ms ?

To run aplay --dump-hw-params I have to compile all the alsa-util 1.0.28 and
alsa-lib 1.0.28. I thought it was easier, however missing many dependencies. 

You know an easier way? or give me a link or address to contact Florian. 
I wanted you instead show a possibly related issue. 
If I run the command paplay -v Europa.wav:

pi at raspberrypi ~ $ paplay -v Europa.wav
Opening a playback stream with sample specification 's16le 2ch 44100Hz' and
channel map 'front-left,front-right'.
Connection established.
Stream successfully created.
Buffer metrics: maxlength=4194304, tlength=352800, prebuf=349276, minreq=3528
Using sample spec 's16le 2ch 44100Hz', channel map 'front-left,front-right'.
Connected to device alsa_output.platform-snd-hifiberry-amp.0.analog-stereo (0,
not suspended).
Stream started.
^CGot signal, exiting.cy: 2288469 usec.

pi at raspberrypi ~ $ top

top - 16:08:16 up 8 min,  3 users,  load average: 0.71, 0.71, 0.37
Tasks:  93 total,   1 running,  92 sleeping,   0 stopped,   0 zombie
%Cpu(s):  7.2 us,  9.4 sy,  0.0 ni, 83.1 id,  0.0 wa,  0.0 hi,  0.3 si,  0.0 st
KiB Mem:    447856 total,   154452 used,   293404 free,    15052 buffers
KiB Swap:   102396 total,        0 used,   102396 free,    78044 cached

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND           
 2355 pulse      9 -11 87984 5824 3540 S   7.9  1.3   1:03.57 pulseaudio        
 2606 root      20   0 26376  15m 4760 S   2.0  3.5   0:10.32 Xorg              
 2772 pi        20   0  4668 1388 1040 R   1.3  0.3   0:04.61 top               
 2900 pi        20   0 83540 2764 2264 S   1.3  0.6   0:00.64 paplay            
 2761 pi        20   0  113m 9.9m 7708 S   0.7  2.3   0:04.76 lxterminal       

feel good music and as you can see above the CPU usage from pulseaudio is
normal. 
While if I run: 

pi at raspberrypi ~ $ paplay -v Desperado.wav
Opening a playback stream with sample specification 's16le 2ch 48000Hz' and
channel map 'front-left,front-right'.
Connection established.
Stream successfully created.
Buffer metrics: maxlength=4194304, tlength=384000, prebuf=380164, minreq=3840
Using sample spec 's16le 2ch 48000Hz', channel map 'front-left,front-right'.
Connected to device alsa_output.platform-snd-hifiberry-amp.0.analog-stereo (0,
suspended).
^CGot signal, exiting.cy: 2000000 usec.   

the application crashes before start reading and I not hear anything, also
pulseaudio will abort and I need to restart it again. The only difference
between the two wav files is that the first has a sampling rate 44100Hz and the
second 48000Hz.
what do you think about?

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