From 8fe723117a8ef543b6e68ba24e50e1c15250f6c5 Mon Sep 17 00:00:00 2001
From: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Date: Tue, 10 Mar 2009 14:35:10 -0700
Subject: [PATCH] iwlwifi: HT performance improvement changes
During rate scaling, checking for 0 retry count before decrement
the count by 1, this can avoid the retry count to become 255 (0xff),
which will cause the rate to drop faster than what we expect during good
condition (receive 0 retry packet). also change the algorithm to make
the rate not drop faster than what we like.
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
drivers/net/wireless/iwlwifi/iwl-agn-rs.c | 11 ++++++-----
drivers/net/wireless/iwlwifi/iwl-agn-rs.h | 2 +-
2 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
index a6f4c74ff2b4..0929f310b2d4 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -801,7 +801,10 @@ static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
!(info->flags & IEEE80211_TX_STAT_AMPDU))
return;
- retries = info->status.rates[0].count - 1;
+ if (info->flags & IEEE80211_TX_STAT_AMPDU)
+ retries = 0;
+ else
+ retries = info->status.rates[0].count - 1;
if (retries > 15)
retries = 15;
@@ -1897,7 +1900,7 @@ static void rs_rate_scale_perform(struct iwl_priv *priv,
if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
scale_action = 1;
else if (low != IWL_RATE_INVALID)
- scale_action = -1;
+ scale_action = 0;
}
/* Both adjacent throughputs are measured, but neither one has better
@@ -1918,9 +1921,7 @@ static void rs_rate_scale_perform(struct iwl_priv *priv,
sr >= IWL_RATE_INCREASE_TH) {
scale_action = 1;
} else {
- IWL_DEBUG_RATE(priv,
- "decrease rate because of high tpt\n");
- scale_action = -1;
+ scale_action = 0;
}
/* Lower adjacent rate's throughput is measured */
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.h b/drivers/net/wireless/iwlwifi/iwl-agn-rs.h
index 345806dd8870..ab59acc405d9 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.h
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.h
@@ -231,7 +231,7 @@ enum {
#define IWL_RS_GOOD_RATIO 12800 /* 100% */
#define IWL_RATE_SCALE_SWITCH 10880 /* 85% */
#define IWL_RATE_HIGH_TH 10880 /* 85% */
-#define IWL_RATE_INCREASE_TH 8960 /* 70% */
+#define IWL_RATE_INCREASE_TH 6400 /* 50% */
#define IWL_RATE_DECREASE_TH 1920 /* 15% */
/* possible actions when in legacy mode */
--
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