Power Performance of Pulseaudio + Alsa with Disabled Period Wakeups (IRQ-less)
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Let me start at the beginning: Recently, pulseaudio not only switched to a more power efficient (and otherwise) timing system. It also provided the infrastructure to use ALSA devices without causing _any_ interrupts, so you CPU can stay longer in standby mode, saving you power and avoiding playback glitches. With kernel 2.6.38 the first driver supports this infrastructure, the snd-hda-intel driver. This is what I tested for power efficiency in this article...
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