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authorEyal Shapira <eyal@wizery.com>2015-09-21 20:03:22 +0300
committerLuca Coelho <luciano.coelho@intel.com>2015-10-05 14:33:30 +0300
commited21a384bbd2b011289dd1b5cab7eebc7ebeda11 (patch)
tree83ed17548c88cbd3b7b89ed56d1ef8d4f148aa65
parent40ce5ed1e9d5c80819733c4fdc40a2b6c531d981 (diff)
iwlwifi: mvm: rs: fix success ratio comparison in rs_get_best_rate
success_ratio is actually 128 * SR in percentage while IWL_MVM_RS_SR_NO_DECREASE is 85%. Fix this by using RS_PERCENT(). This bug caused the if branch to be always executed. This in turn led to always selecting a rate, following a column switch, in which the expected throughput would exceed the best expected current throughput. In some scenarios where the success ratio isn't >85% such a rate could be too aggressive leading us to avoid the new column. This has the potential of causing sub optimal performance. Reported-by: Moshe Harel <moshe.harel@intel.com> Signed-off-by: Eyal Shapira <eyalx.shapira@intel.com> Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
-rw-r--r--drivers/net/wireless/iwlwifi/mvm/rs.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c
index 2bf2a0895723..435e1e40edb8 100644
--- a/drivers/net/wireless/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/rs.c
@@ -1527,7 +1527,7 @@ static s32 rs_get_best_rate(struct iwl_mvm *mvm,
u32 target_tpt;
int rate_idx;
- if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
+ if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
target_tpt = 100 * expected_current_tpt;
IWL_DEBUG_RATE(mvm,
"SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
@@ -1535,7 +1535,7 @@ static s32 rs_get_best_rate(struct iwl_mvm *mvm,
} else {
target_tpt = lq_sta->last_tpt;
IWL_DEBUG_RATE(mvm,
- "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
+ "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
success_ratio, target_tpt);
}