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- From: Felix Fietkau <[email protected]>
- Date: Sun, 26 Jun 2022 11:43:25 +0200
- Subject: [PATCH] mac80211: increase quantum for airtime scheduler
- Given the typical AQL budget and queue length, a quantum of 256 with the
- default station weight often requires iterating over all queues frequently,
- until one of them becomes eligible.
- Improve performance by using 8 times station weight as scheduler quantum
- Signed-off-by: Felix Fietkau <[email protected]>
- ---
- --- a/net/mac80211/ieee80211_i.h
- +++ b/net/mac80211/ieee80211_i.h
- @@ -90,6 +90,8 @@ extern const u8 ieee80211_ac_to_qos_mask
- */
- #define AIRTIME_ACTIVE_DURATION (HZ / 10)
-
- +#define AIRTIME_QUANTUM_SHIFT 3
- +
- struct ieee80211_bss {
- u32 device_ts_beacon, device_ts_presp;
-
- --- a/net/mac80211/tx.c
- +++ b/net/mac80211/tx.c
- @@ -3895,7 +3895,7 @@ struct ieee80211_txq *ieee80211_next_txq
-
- if (deficit < 0)
- sta->airtime[txqi->txq.ac].deficit +=
- - sta->airtime_weight;
- + sta->airtime_weight << AIRTIME_QUANTUM_SHIFT;
-
- if (deficit < 0 || !aql_check) {
- list_move_tail(&txqi->schedule_order,
- @@ -4038,7 +4038,8 @@ bool ieee80211_txq_may_transmit(struct i
- }
- sta = container_of(iter->txq.sta, struct sta_info, sta);
- if (ieee80211_sta_deficit(sta, ac) < 0)
- - sta->airtime[ac].deficit += sta->airtime_weight;
- + sta->airtime[ac].deficit += sta->airtime_weight <<
- + AIRTIME_QUANTUM_SHIFT;
- list_move_tail(&iter->schedule_order, &local->active_txqs[ac]);
- }
-
- @@ -4046,7 +4047,7 @@ bool ieee80211_txq_may_transmit(struct i
- if (sta->airtime[ac].deficit >= 0)
- goto out;
-
- - sta->airtime[ac].deficit += sta->airtime_weight;
- + sta->airtime[ac].deficit += sta->airtime_weight << AIRTIME_QUANTUM_SHIFT;
- list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]);
- spin_unlock_bh(&local->active_txq_lock[ac]);
-
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