diff options
| author | Felix Fietkau <nbd@nbd.name> | 2020-07-24 21:28:16 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2020-07-31 10:24:24 +0300 |
| commit | 3ff901cb5df1d2102e924d75d91347a2a3070fa5 (patch) | |
| tree | 070e3aea13a392b0a96451c20ec86cc67b8df209 /net/mac80211/airtime.c | |
| parent | 1303a51c24100b3b1915d6f9072fe5ae5bb4c5f6 (diff) | |
| download | linux-3ff901cb5df1d2102e924d75d91347a2a3070fa5.tar.xz | |
mac80211: improve AQL tx airtime estimation
AQL does not take into account that most HT/VHT/HE traffic is A-MPDU aggregated.
Because of that, the per-packet airtime overhead is vastly overestimated.
Improve it by assuming an average aggregation length of 16 for non-legacy
traffic if not using the VO AC queue.
This should improve performance with high data rates, especially with multiple
stations
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20200724182816.18678-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/airtime.c')
| -rw-r--r-- | net/mac80211/airtime.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/net/mac80211/airtime.c b/net/mac80211/airtime.c index 9fc2968856c0..366f76c9003d 100644 --- a/net/mac80211/airtime.c +++ b/net/mac80211/airtime.c @@ -551,7 +551,7 @@ EXPORT_SYMBOL_GPL(ieee80211_calc_tx_airtime); u32 ieee80211_calc_expected_tx_airtime(struct ieee80211_hw *hw, struct ieee80211_vif *vif, struct ieee80211_sta *pubsta, - int len) + int len, bool ampdu) { struct ieee80211_supported_band *sband; struct ieee80211_chanctx_conf *conf; @@ -572,10 +572,26 @@ u32 ieee80211_calc_expected_tx_airtime(struct ieee80211_hw *hw, if (pubsta) { struct sta_info *sta = container_of(pubsta, struct sta_info, sta); - - return ieee80211_calc_tx_airtime_rate(hw, - &sta->tx_stats.last_rate, - band, len); + struct ieee80211_tx_rate *rate = &sta->tx_stats.last_rate; + u32 airtime; + + if (!(rate->flags & (IEEE80211_TX_RC_VHT_MCS | + IEEE80211_TX_RC_MCS))) + ampdu = false; + + /* + * Assume that HT/VHT transmission on any AC except VO will + * use aggregation. Since we don't have reliable reporting + * of aggregation length, assume an average of 16. + * This will not be very accurate, but much better than simply + * assuming un-aggregated tx. + */ + airtime = ieee80211_calc_tx_airtime_rate(hw, rate, band, + ampdu ? len * 16 : len); + if (ampdu) + airtime /= 16; + + return airtime; } if (!conf) |