* [PATCH] mac80211: shorten the passive dwell time for sw scans
@ 2009-06-30 12:49 Helmut Schaa
0 siblings, 0 replies; only message in thread
From: Helmut Schaa @ 2009-06-30 12:49 UTC (permalink / raw)
To: John Linville; +Cc: linux-wireless, Johannes Berg, Holger Schurig
mac80211's software scan implementation uses a passive dwell time of
(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 125ms should save us
something around a second on cards capable of 11a and we should still be
able to catch beacons from most access points (assuming a ~100ms beacon
interval).
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
---
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index df24f8e..c075d34 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -26,7 +28,7 @@
#define IEEE80211_PROBE_DELAY (HZ / 33)
#define IEEE80211_CHANNEL_TIME (HZ / 33)
-#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
+#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8)
struct ieee80211_bss *
ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
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2009-06-30 12:49 [PATCH] mac80211: shorten the passive dwell time for sw scans Helmut Schaa
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