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authorSimon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>2012-12-04 01:21:30 +0400
committerJohannes Berg <johannes.berg@intel.com>2012-12-04 18:54:43 +0400
commit2f91a96799d155d56a0663dbe00fc45c6721a763 (patch)
tree7606d5f2feb8f7fcc938a31f1687ec2a6fa10376 /net/mac80211
parentda29d2a5780d80857773d7776b7603a449b0b6e0 (diff)
downloadlinux-2f91a96799d155d56a0663dbe00fc45c6721a763.tar.xz
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: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/ibss.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 11a6a1bde2fd..700d0ed736c9 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -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);