<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <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#c25">Comment # 25</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 <a class="email" href="mailto:alessandroferri_015@fastwebnet.it" title="Alessandro Ferri <alessandroferri_015@fastwebnet.it>"> Alessandro Ferri</a> <pre>I have the exact same problem with the HiFiBerry Dac. Also in this case the use of the CPU by pulseaudio skip to excessive values with the newer kernel (3.12.28/29) compared to the old kernel (3.12.25). Below I will report /etc/modules setup and reports. I think it's definitely a pulseaudio problem of the underlying I2S subsystem service. # /etc/modules: kernel modules to load at boot time. # # This file contains the names of kernel modules that should be loaded # at boot time, one per line. Lines beginning with "#" are ignored. # Parameters can be specified after the module name. i2c-bcm2708 i2c-dev snd_soc_bcm2708 bcm2708_dmaengine snd_soc_pcm5102a snd_soc_hifiberry_dac pi@raspberrypi ~ $ uname -a Linux raspberrypi 3.12.29+ #714 PREEMPT Wed Oct 1 23:11:38 BST 2014 armv6l GNU/Linux pi@raspberrypi ~ $ top top - 10:38:46 up 2 min, 2 users, load average: 1.14, 0.52, 0.20 Tasks: 95 total, 1 running, 94 sleeping, 0 stopped, 0 zombie %Cpu(s): 15.3 us, 10.8 sy, 3.1 ni, 70.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 447864 total, 150008 used, 297856 free, 15008 buffers KiB Swap: 102396 total, 0 used, 102396 free, 71172 cached waiting... PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2219 pulse 9 -11 88336 8656 3552 S 13.7 1.9 0:15.47 pulseaudio 2629 pi 20 0 124m 11m 9508 S 4.9 2.6 0:01.76 pcmanfm 2393 root 30 10 91464 2304 1856 S 4.6 0.5 0:03.76 LightSone 2507 root 20 0 20068 12m 4252 S 2.0 2.8 0:02.37 Xorg 2675 pi 20 0 4672 1376 1032 R 1.3 0.3 0:00.43 top 2664 pi 20 0 113m 9820 7676 S 0.7 2.2 0:01.20 lxterminal 4 root 20 0 0 0 0 S 0.3 0.0 0:00.10 kworker/0:0 2153 avahi 20 0 3384 1664 1396 S 0.3 0.4 0:00.16 avahi-daemon 2628 pi 20 0 103m 8956 7132 S 0.3 2.0 0:01.43 lxpanel streaming... pi@raspberrypi ~ $ top top - 10:41:08 up 4 min, 2 users, load average: 1.61, 0.87, 0.38 Tasks: 97 total, 1 running, 96 sleeping, 0 stopped, 0 zombie %Cpu(s): 57.0 us, 37.6 sy, 1.9 ni, 0.0 id, 0.0 wa, 0.0 hi, 3.5 si, 0.0 st KiB Mem: 447864 total, 198268 used, 249596 free, 16064 buffers KiB Swap: 102396 total, 0 used, 102396 free, 81420 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2219 pulse 9 -11 88336 36m 3552 S 57.7 8.3 0:45.57 pulseaudio 2284 pi 20 0 117m 5000 2744 S 35.2 1.1 0:09.15 shairport 2507 root 20 0 23504 15m 4984 S 2.2 3.5 0:08.82 Xorg 2393 root 30 10 91464 2304 1856 S 1.9 0.5 0:09.09 LightSone 2695 pi 20 0 4672 1380 1032 R 1.6 0.3 0:00.93 top 2664 pi 20 0 114m 10m 8600 S 1.0 2.5 0:04.02 lxterminal (In reply to Raymond from <a href="show_bug.cgi?id=84585#c23">comment #23</a>) > <a href="http://0pointer.de/blog/projects/pulse-glitch-free.html">http://0pointer.de/blog/projects/pulse-glitch-free.html</a> > > image 1 is correct only if sound card can report dma residue, which provide > more accurate position than period boundary > > if sound card cannot report dma residue, hwptr just increment by period > size/time, your cannot rewind when using two periods per buffer > > > <a href="http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa/">http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa/</a> > alsa-util.c?id=826c8f69d34ef49e86fe0ab6c93c1ffba8916131 > > <a href="https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/">https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/</a> > ?id=ab69a4904b5dd4d7cd6996587ba066bca8d13838 > > > > timer scheduling is enabled by default since pulseaudio assume all sound > card can report dma residue</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>