Re: wireless powersaving (in NM?)

[Johannes Berg <johannes@sipsolutions.net>]

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On Tue, 2009-03-24 at 11:32 +0100, Marcel Holtmann wrote:

> I prefer that we not export this over WEXT at all and only via nl80211
> so we get async notification if some one changes it. We should extend
> wpa_supplicant with an option to set power saving on/off/default and
> then make sure it gets exported via its CLI or D-Bus. So if Network
> Manger or ConnMan cares to change these values they can.
> 
> However personally I think the need for enabling or disabling power
> savings is not really useful except for testing purposes. In a real life
> deployed system it should be enabled all the time. Broken drivers or
> hardware that is limited can disable it on kernel level, but for
> userspace we only need this for debugging.

Kalle makes a point about broken APs, which I personally haven't run
into but I'm sure exist -- and I see no way to automatically detect
that. Therefore, it seems necessary to allow overriding this even for
non-debugging purposes.

I have no problem with just changing the default to be enabled though,
but that requires some work to turn off automatically for most virtual
interface combinations. As I said before -- this needs to be fairly
conservative and only when applications register their requirements can
we go to lower power states with higher latency.

johannes

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