* mac80211 sw scan: passive dwell time
@ 2009-06-30 11:09 Helmut Schaa
2009-06-30 11:13 ` Holger Schurig
0 siblings, 1 reply; 2+ messages in thread
From: Helmut Schaa @ 2009-06-30 11:09 UTC (permalink / raw)
To: linux-wireless; +Cc: Johannes Berg
Hi,
in mac80211's software scan implementation the passive dwell time
IEEE80211_PASSIVE_CHANNEL_TIME is set to (HZ / 5) which means we
stay 200ms on each passive channel. Compared to iwlwifi's hw scan
and the old ipw* drivers which use values around 120ms this is quite
long.
Reducing the passive dwell time from 200ms to 120ms could save us
something around a second on cards capable of 11a and we would be still
able to catch beacons from most access points (assuming a ~100ms beacon
interval).
Objections?
Thanks,
Helmut
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