2012-12-13 11:15:08

by Chun-Yeow Yeoh

Subject: [PATCH] [mac80211] use short slot time in mesh for 5GHz

Use short slot time in 5GHz for mesh. The performance is
increased from 16.4Mbps to 23.4Mbps for two directly
connected mesh STAs operating in legacy rate using iperf
measurement. Almost similar to the results claimed in IBSS
mode.

Signed-off-by: Chun-Yeow Yeoh <[email protected]>
---
net/mac80211/mesh.c | 19 ++++++++++++++-----
1 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 1bf03f9..ee0d8a3 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -607,6 +607,13 @@ void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct ieee80211_local *local = sdata->local;
+ u32 changed;
+
+ changed = BSS_CHANGED_BEACON |
+ BSS_CHANGED_BEACON_ENABLED |
+ BSS_CHANGED_HT |
+ BSS_CHANGED_BASIC_RATES |
+ BSS_CHANGED_BEACON_INT;

local->fif_other_bss++;
/* mesh ifaces must set allmulti to forward mcast traffic */
@@ -628,11 +635,13 @@ void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
sdata->vif.bss_conf.basic_rates =
ieee80211_mandatory_rates(sdata->local,
ieee80211_get_sdata_band(sdata));
- ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
- BSS_CHANGED_BEACON_ENABLED |
- BSS_CHANGED_HT |
- BSS_CHANGED_BASIC_RATES |
- BSS_CHANGED_BEACON_INT);
+
+ if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ) {
+ sdata->vif.bss_conf.use_short_slot = true;
+ changed |= BSS_CHANGED_ERP_SLOT;
+ }
+
+ ieee80211_bss_info_change_notify(sdata, changed);

netif_carrier_on(sdata->dev);
}
--
1.7.0.4

2012-12-13 14:14:45

by Johannes Berg

Subject: Re: [PATCH] [mac80211] use short slot time in mesh for 5GHz

On Thu, 2012-12-13 at 18:59 +0800, Chun-Yeow Yeoh wrote:
> Use short slot time in 5GHz for mesh. The performance is
> increased from 16.4Mbps to 23.4Mbps for two directly
> connected mesh STAs operating in legacy rate using iperf
> measurement. Almost similar to the results claimed in IBSS
> mode.

Applied (with a few small modifications)

johannes