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authorMeenakshi Venkataraman <meenakshi.venkataraman@intel.com>2011-07-08 19:46:23 +0400
committerJohn W. Linville <linville@tuxdriver.com>2011-07-11 23:02:07 +0400
commit207ecc5eab908843449c167f7264a35d7d5d5e0b (patch)
tree3425f0964810c9d1edd0bcc097a5838ce1f5c726 /drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
parent615f7b9bb1f8e0e3188470245cec44f175189084 (diff)
downloadlinux-207ecc5eab908843449c167f7264a35d7d5d5e0b.tar.xz
iwlagn: Enable/disable PS poll based on RSSI and BT coex traffic state
WiFi throughput drops drastically when BT is turned on, BT and WiFi are simultaneously transmitting/receiving traffic. This is particularly true when BT has higher priority over WiFi, and hence the device defers TX frames. The AP assumes that the channel is bad and reduces the data rate, implying longer airtime, which exacerbates the problem further, resulting ultimately in what is popularly called the "death-spiral" phenomenon. The use of PS-poll in such scenarios guarantees a low but consistent throughput. Since the death-spiral phenomenon is observed only when the RSSI is low, use PS-poll only when RSSI is low and disable when high, with a known hysterisis. This feature specifies the high and low thresholds and implements the callbacks registered with mac80211, which will be called when threshold events occur. iwlwifi: dynamic pspoll: optimize rssi monitor code Signed-off-by: Meenakshi Venkataraman <meenakshi.venkataraman@intel.com> Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-agn-rxon.c')
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-agn-rxon.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c b/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
index d32cee1a758a..fca376e91541 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
@@ -731,6 +731,8 @@ void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
}
ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
}
+
+ iwlagn_bt_coex_rssi_monitor(priv);
}
if (ctx->ht.enabled) {