Hi Simon, On Tue, Dec 4, 2012 at 8:21 AM, Simon Wunderlich <simon.wunderlich@xxxxxxxxxxxxxxxxxxxx> wrote: > 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@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Mathias Kretschmer <mathias.kretschmer@xxxxxxxxxxxxxxxxxxx> > --- > net/mac80211/ibss.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c > index fa862b2..1a5d29c 100644 > --- a/net/mac80211/ibss.c > +++ b/net/mac80211/ibss.c > @@ -201,6 +201,19 @@ 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; > + I don't know if this is done elsewhere, but this code doesn't match the comment - there is no test for IBSS mode. Thanks, -- Julian Calaby Email: julian.calaby@xxxxxxxxx Profile: http://www.google.com/profiles/julian.calaby/ .Plan: http://sites.google.com/site/juliancalaby/ -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
