Re: [PATCH] nl80211: specify RSSI threshold when scanning

[Kalle Valo <kvalo@qca.qualcomm.com>]

On 06/13/2012 02:37 PM, Luciano Coelho wrote:
> On Wed, 2012-06-13 at 07:40 +0200, Johannes Berg wrote:
>> On Tue, 2012-06-12 at 13:43 -0700, Thomas Pedersen wrote:
>>> Support configuring an RSSI threshold in dBm (s32) when requesting
>>> scheduled scan, below which a BSS won't be reported by the cfg80211
>>> driver.
>>
>> I'm confused -- were you going to do scheduled scan only? Makes sense,
>> but if you could maybe change the subject a bit to "specify ... in
>> scheduled scan"?
> 
> It makes more sense with scheduled scans, but maybe it is also desirable
> with normal scans to reduce the amount of scan results traffic?
> 
> At least if we consider the intermediate scan results that Victor has
> been working on... We may want to report all scan results at the end,
> but only send intermediate events if all the matches are satisfied, for
> example.
> 
> Just thinking out loud a bit.

Good point.

Funnily enough I don't have any idea how ath6kl has implemented this
feature, but in theory this feature is useful also for the current
normal scan (when the firmware/hardware supports it) as we can avoid
host wakeups. If there are 10 APs, but all are below the RSSI threshold,
we will have only 1 host wakeup (scan ready event) opposed to 11 wakeups
(10 AP found events plus 1 scan ready event).

Kalle