[alsa-devel] [RFC] disabling ALSA period interrupts
superquad.vortex2 at gmail.com
Fri Apr 30 03:09:12 CEST 2010
2010/4/30 pl bossart <bossart.nospam at gmail.com>
> When PulseAudio is used and all PCM is routed through PulseAudio
> (Fedora, Meego, etc), the notion of ALSA periods isn't very useful.
> PulseAudio uses a timer to refill buffers and the period interrupts
> are not used at all.
> So why not disable them entirely to reduce the number of wakeups? This
> is possible with a number of existing DMA controllers. The simple
> patch attached shows a proof-of-concept on HDAudio, it's been working
> for 5 hours on my Fedora12 laptop without any glitches and powertop
> does show _zero_ wakeups from the HDAudio controller (except on
> startup). I am told by my colleagues working in Windows environments
> that this is what's done on Vista/Windows7 btw. This isn't to say
> Windows is great but that artificial generation of not-needed
> interrupts is avoidable.
Do your test need the patch which you have posted to pulseaudio developer
it seem that fix should be in driver side if it is hardware specific
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