[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 #72 from Alessandro Ferri <alessandroferri_015 at fastwebnet.it> ---
I think this is a substantial difference in the behavior of pulseaudio 
compared to the two Kernel. 
With kernel 3:12:29 increasing steadily up to 745.99 ms: 

(55 620 | 0000) I: [alsa-sink] alsa-sink.c: Increasing wakeup watermark to
745.99 ms 

With kernel is 3:12:25 fix one time to 30 ms: 

(11.863 | 0.000) I: [alsa-sink] alsa-sink.c: Increasing wakeup watermark to
30.00 ms 

The same thing with minimal latency: 
With kernel 3:12:25 no increasing latency, with kernel 3.12.29 Increasing
latency up to: 



(48 424 | 0256) I: [alsa-sink] alsa-sink.c: Increasing minimal latency to
756.00 ms




(In reply to Raymond from comment #71)
> 
> latency seem fixed at 105ms 3.12.25 with 30ms wakeup
> 
> 
> 
> 126|   0.000) I: [pulseaudio] sink-input.c:     media.name = "Shairport
> Stream"
> (   9.126|   0.000) I: [pulseaudio] sink-input.c:     application.name =
> "AirAni-b35336"
> (   9.126|   0.000) I: [pulseaudio] sink-input.c:     native-protocol.peer =
> "UNIX socket client"
> (   9.126|   0.000) I: [pulseaudio] sink-input.c:    
> native-protocol.version = "26"
> (   9.126|   0.000) I: [pulseaudio] sink-input.c:     application.process.id
> = "4160"
> (   9.126|   0.000) I: [pulseaudio] sink-input.c:    
> application.process.user = "pi"
> (   9.126|   0.000) I: [pulseaudio] sink-input.c:    
> application.process.host = "raspberrypi"
> (   9.126|   0.000) I: [pulseaudio] sink-input.c:    
> application.process.binary = "shairport"
> (   9.126|   0.000) I: [pulseaudio] sink-input.c:     application.language =
> "C"
> (   9.126|   0.000) I: [pulseaudio] sink-input.c:     window.x11.display =
> ":0.0"
> (   9.126|   0.000) I: [pulseaudio] sink-input.c:    
> application.process.machine_id = "d3670ff77a0bb988a953e7f053a3f4e7"
> (   9.126|   0.000) I: [pulseaudio] sink-input.c:    
> module-stream-restore.id = "sink-input-by-application-name:AirAni-b35336"
> (   9.139|   0.012) I: [pulseaudio] protocol-native.c: Requested
> tlength=250.00 ms, minreq=20.00 ms
> (   9.139|   0.000) D: [pulseaudio] protocol-native.c: Adjust latency mode
> enabled, configuring sink latency to half of overall latency.
> (   9.140|   0.000) D: [alsa-sink] alsa-sink.c: Cutting sleep time for the
> initial iterations by half.
> (   9.140|   0.000) D: [alsa-sink] alsa-sink.c: Cutting sleep time for the
> initial iterations by half.
> (   9.149|   0.008) D: [pulseaudio] protocol-native.c: Requested
> latency=105.00 ms, Received latency=105.00 ms
> (   9.149|   0.000) D: [pulseaudio] memblockq.c: memblockq requested:
> maxlength=4194304, tlength=25580, base=4, prebuf=22056, minreq=3528
> maxrewind=0
> (   9.149|   0.000) D: [pulseaudio] memblockq.c: memblockq sanitized:
> maxlength=4194304, tlength=25580, base=4, prebuf=22056, minreq=3528
> maxrewind=0
> (   9.150|   0.000) I: [pulseaudio] protocol-native.c: Final latency 250.01
> ms = 105.01 ms + 2*20.00 ms + 105.00 ms
> (   9.150|   0.000) D: [alsa-sink] alsa-sink.c: Cutting sleep time for the
> initial iterations by half.
> (   9.151|   0.000) D: [alsa-sink] alsa-sink.c: Latency set to 105.00ms
> (   9.151|   0.000) D: [alsa-sink] alsa-sink.c: hwbuf_unused=334280
> (   9.151|   0.000) D: [alsa-sink] alsa-sink.c: setting avail_min=87319
> (   9.152|   0.000) D: [alsa-sink] alsa-sink.c: Requesting rewind due to
> latency change.
> (   9.152|   0.000) D: [alsa-sink] alsa-sink.c: Requested to rewind 352800
> bytes.
> (   9.152|   0.000) D: [alsa-sink] alsa-sink.c: Limited to 347040 bytes.
> (   9.153|   0.000) D: [alsa-sink] alsa-sink.c: before: 86760
> (   9.153|   0.000) D: [alsa-sink] alsa-sink.c: after: 86760
> (   9.153|   0.000) D: [alsa-sink] alsa-sink.c: Rewound 347040 bytes.
> (   9.153|   0.000) D: [alsa-sink] sink.c: Processing rewind...
> (   9.154|   0.000) D: [alsa-sink] sink-input.c: Have to rewind 347040 bytes
> on render memblockq.
> (   9.154|   0.000) D: [alsa-sink] source.c: Processing rewind...
> (   9.155|   0.001) D: [pulseaudio] core-subscribe.c: Dropped redundant
> event due to change event.
> (   9.156|   0.000) D: [pulseaudio] reserve-wrap.c: Device lock status of
> reserve-monitor-wrapper at Audio0 changed: not busy
> (   9.159|   0.002) D: [pulseaudio] protocol-dbus.c: Interface
> org.PulseAudio.Core1.Stream added for object
> /org/pulseaudio/core1/playback_stream0
> (  11.862|   2.703) I: [alsa-sink] alsa-sink.c: Underrun!
> (  11.863|   0.000) I: [alsa-sink] alsa-sink.c: Increasing wakeup watermark
> to 30.00 ms

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