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Commit 2f91a967 authored by Simon Wunderlich's avatar Simon Wunderlich Committed by Johannes Berg
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mac80211: adapt slot time in IBSS mode 



In 5GHz/802.11a, we are allowed to use short slot times. Doing this
may increases performance by 20% for legacy connections (54 MBit/s).
I can confirm this in my tests (27% more throughput using iperf), and
also have a small positive effect (5% more throughput) for HT rates,
tested on 1 stream.

Signed-off-by: default avatarSimon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: default avatarMathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent da29d2a5

net/mac80211/ibss.c

+14 −0
Original line number Diff line number Diff line
@@ -201,6 +201,20 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 
	bss_change |= BSS_CHANGED_BASIC_RATES;

	bss_change |= BSS_CHANGED_HT;

	bss_change |= BSS_CHANGED_IBSS;



	/*

	 * In 5 GHz/802.11a, we can always use short slot time.

	 * (IEEE 802.11-2012 18.3.8.7)

	 *

	 * In 2.4GHz, we must always use long slots in IBSS for compatibility

	 * reasons.

	 * (IEEE 802.11-2012 19.4.5)

	 *

	 * HT follows these specifications (IEEE 802.11-2012 20.3.18)

	 */

	sdata->vif.bss_conf.use_short_slot = chan->band == IEEE80211_BAND_5GHZ;

	bss_change |= BSS_CHANGED_ERP_SLOT;



	sdata->vif.bss_conf.ibss_joined = true;

	sdata->vif.bss_conf.ibss_creator = creator;

	ieee80211_bss_info_change_notify(sdata, bss_change);