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| author | Eyal Shapira <eyal@wizery.com> | 2015-09-21 20:03:22 +0300 |
|---|---|---|
| committer | Luca Coelho <luciano.coelho@intel.com> | 2015-10-05 14:33:30 +0300 |
| commit | ed21a384bbd2b011289dd1b5cab7eebc7ebeda11 (patch) | |
| tree | 83ed17548c88cbd3b7b89ed56d1ef8d4f148aa65 /drivers/net/wireless/iwlwifi | |
| parent | 40ce5ed1e9d5c80819733c4fdc40a2b6c531d981 (diff) | |
| download | linux-ed21a384bbd2b011289dd1b5cab7eebc7ebeda11.tar.gz linux-ed21a384bbd2b011289dd1b5cab7eebc7ebeda11.tar.bz2 linux-ed21a384bbd2b011289dd1b5cab7eebc7ebeda11.zip | |
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>
Diffstat (limited to 'drivers/net/wireless/iwlwifi')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/mvm/rs.c | 4 |
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); } |