minstrel_ht: make the ewma of the ampdu length more smooth by updating it on stats...

SVN-Revision: 20153

diff --git a/package/mac80211/patches/560-minstrel_ht.patch b/package/mac80211/patches/560-minstrel_ht.patch
index 6c3d08eac2846cf9a2bc909d582b487c91ec5b07..c51d541fbb9ed3379cbd7a70c2b895fd4cb5a627 100644 (file)
--- a/package/mac80211/patches/560-minstrel_ht.patch
+++ b/package/mac80211/patches/560-minstrel_ht.patch
@@ -68,7 +68,7 @@
  
 --- /dev/null
 +++ b/net/mac80211/rc80211_minstrel_ht.c
-@@ -0,0 +1,809 @@
+@@ -0,0 +1,815 @@
 +/*
 + * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
 + *
@@ -262,6 +262,13 @@
 +      int cur_prob, cur_prob_tp, cur_tp, cur_tp2;
 +      int group, i, index;
 +
++      if (mi->ampdu_packets > 0) {
++              mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
++                      MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL);
++              mi->ampdu_len = 0;
++              mi->ampdu_packets = 0;
++      }
++
 +      mi->sample_slow = 0;
 +      mi->sample_count = 0;
 +      mi->max_tp_rate = 0;
@@ -415,6 +422,25 @@
 +      }
 +}
 +
++static void
++minstrel_aggr_check(struct minstrel_priv *mp, struct ieee80211_sta *pubsta, struct sk_buff *skb)
++{
++      struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
++      struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
++      u16 tid;
++
++      if (unlikely(!ieee80211_is_data_qos(hdr->frame_control)))
++              return;
++
++      if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE)))
++              return;
++
++      tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
++      if (likely(sta->ampdu_mlme.tid_state_tx[tid] != HT_AGG_STATE_IDLE))
++              return;
++
++      ieee80211_start_tx_ba_session(pubsta, tid);
++}
 +
 +static void
 +minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband,
@@ -444,8 +470,8 @@
 +              info->status.ampdu_len = 1;
 +      }
 +
-+      mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
-+              MINSTREL_FRAC(info->status.ampdu_len, 1), 90);
++      mi->ampdu_packets++;
++      mi->ampdu_len += info->status.ampdu_len;
 +
 +      if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) {
 +              mi->sample_wait = 4 + MINSTREL_TRUNC(mi->avg_ampdu_len);
@@ -490,8 +516,10 @@
 +          MINSTREL_FRAC(20, 100))
 +              minstrel_downgrade_rate(mi, &mi->max_tp_rate2, false);
 +
-+      if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000))
++      if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000)) {
 +              minstrel_ht_update_stats(mp, mi);
++              minstrel_aggr_check(mp, sta, skb);
++      }
 +}
 +
 +static void
@@ -616,26 +644,6 @@
 +}
 +
 +static void
-+minstrel_aggr_check(struct minstrel_priv *mp, struct ieee80211_sta *pubsta, struct sk_buff *skb)
-+{
-+      struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
-+      struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
-+      u16 tid;
-+
-+      if (unlikely(!ieee80211_is_data_qos(hdr->frame_control)))
-+              return;
-+
-+      if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE)))
-+              return;
-+
-+      tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
-+      if (likely(sta->ampdu_mlme.tid_state_tx[tid] != HT_AGG_STATE_IDLE))
-+              return;
-+
-+      ieee80211_start_tx_ba_session(pubsta, tid);
-+}
-+
-+static void
 +minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
 +                     struct ieee80211_tx_rate_control *txrc)
 +{
@@ -652,8 +660,6 @@
 +      if (!msp->is_ht)
 +              return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc);
 +
-+      minstrel_aggr_check(mp, sta, txrc->skb);
-+
 +      sample_idx = minstrel_get_sample_rate(mp, mi);
 +      if (sample_idx >= 0) {
 +              minstrel_ht_set_rate(mp, mi, &ar[0], sample_idx,
@@ -880,7 +886,7 @@
 +}
 --- /dev/null
 +++ b/net/mac80211/rc80211_minstrel_ht.h
-@@ -0,0 +1,121 @@
+@@ -0,0 +1,125 @@
 +/*
 + * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
 + *
@@ -951,7 +957,11 @@
 +};
 +
 +struct minstrel_ht_sta {
-+      /* ampdu length average (EWMA) */
++      /* ampdu length (average, per sampling interval) */
++      unsigned int ampdu_len;
++      unsigned int ampdu_packets;
++
++      /* ampdu length (EWMA) */
 +      unsigned int avg_ampdu_len;
 +
 +      /* best throughput rate */