<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#c23">Comment # 23</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:superquad.vortex2@gmail.com" title="Raymond <superquad.vortex2@gmail.com>"> Raymond</a> <pre><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/alsa-util.c?id=826c8f69d34ef49e86fe0ab6c93c1ffba8916131">http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa/alsa-util.c?id=826c8f69d34ef49e86fe0ab6c93c1ffba8916131</a> <a href="https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/?id=ab69a4904b5dd4d7cd6996587ba066bca8d13838">https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/?id=ab69a4904b5dd4d7cd6996587ba066bca8d13838</a> 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>