1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
From: Felix Fietkau <nbd@nbd.name>
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 <nbd@nbd.name>
---
--- 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
@@ -3894,7 +3894,7 @@ 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,
@@ -4037,7 +4037,8 @@ 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]);
}
@@ -4045,7 +4046,7 @@ 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]);
|
