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Re: [PATCH 2/2] mac80211: make listen_interval be configurable by low level driver

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On Tue, 2008-07-15 at 11:29 +0300, Tomas Winkler wrote:

> We are providing power save user interface reach enough to specify all
> the above requirements.
> I think you are both misinterpreting listen interval meaning.
> Listen interval merely says to AP for how many beacons save direct
> packets for this STA. It doesn't mean
> it's can be shorter and it  does say it's won't be longer. 

Right, but it does make sense to advertise what we're using, and this
patch just adds a strict "driver tells mac80211 what it's using" flow.
That's mostly what I'm objecting to. If you were calling the variable
"max_listen_interval" and having mac80211 send it back to the driver in
the BSS config as bssconf->listen_interval, and, for now, simply use the
max, I wouldn't have a problem with it.

> It's
> doesn't affect power save dynamics it's just sets upper limit.
> This value for iwlwifi hw is derived from maximal supported  beacon
> interval and size of the internal HW timers.
> This value is hard coded in the driver.

Shouldn't it depend on the beacon interval then?

johannes

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