14.07.2015 21:36, Alexander E. Patrakov wrote:
14.07.2015 21:17, Mark Brown wrote:
On Tue, Jul 14, 2015 at 09:04:30PM +0500, Alexander E. Patrakov wrote:
I would like to see some direct measurements related to recent power-saving proposals, including the "disable rewinds" flag. Myself, I can redo battery-life measurements on Intel-based laptops that my colleagues have, and maybe compare dmix, PulseAudio and CRAS in terms of power consumption.
The numbers I seem to remember seeing at the time were these IIRC:
http://linux-tipps.blogspot.co.uk/2011/04/power-performance-of-pulseaudio-al...
saying there was a 0.4W win (I think Arun had some similar numbers).
Thanks for the link. I have no reason to doubt these measurements. Note, however, that they are of the "pulseaudio vs pulseaudio" type, and give no insight into the structure of the win.
Oops, sorry for misreading the blog post. It's actually "alsa vs pulseaudio vs high-latency pulseaudio", and does prove that, on the reporter's hardware, the win is not related to userspace inefficiency.