[alsa-devel] [REANNOUNCE] Audio Mini Summit 2015, 8th October, Dublin

[Alexander E. Patrakov]

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-alsa.html
>>
>>
>> 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.

-- 
Alexander E. Patrakov