mac80211: minstrel_ht - reduce the overhead of rate sampling

- reduce the number of retransmission attempts for sample rates
- sample lower rates less often
- do not use RTS/CTS for sampling frames
- increase the time between sampling attempts

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index 2a18d6602d4ade8bc385fecc4bca919811875ba1..2d6f0259e0c694e5b18a76401519f447f1885e78 100644 (file)
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -407,8 +407,8 @@ minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband,
        mi->ampdu_len += info->status.ampdu_len;
 
        if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) {
-               mi->sample_wait = 4 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len);
-               mi->sample_tries = 3;
+               mi->sample_wait = 16 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len);
+               mi->sample_tries = 2;
                mi->sample_count--;
        }
 
@@ -506,7 +506,9 @@ minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
        if (!mr->retry_updated)
                minstrel_calc_retransmit(mp, mi, index);
 
-       if (mr->probability < MINSTREL_FRAC(20, 100))
+       if (sample)
+               rate->count = 1;
+       else if (mr->probability < MINSTREL_FRAC(20, 100))
                rate->count = 2;
        else if (rtscts)
                rate->count = mr->retry_count_rtscts;
@@ -562,7 +564,7 @@ minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
         */
        if (minstrel_get_duration(sample_idx) >
            minstrel_get_duration(mi->max_tp_rate)) {
-               if (mr->sample_skipped < 10)
+               if (mr->sample_skipped < 20)
                        goto next;
 
                if (mi->sample_slow++ > 2)
@@ -586,6 +588,7 @@ minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
        struct minstrel_ht_sta *mi = &msp->ht;
        struct minstrel_priv *mp = priv;
        int sample_idx;
+       bool sample = false;
 
        if (rate_control_send_low(sta, priv_sta, txrc))
                return;
@@ -596,10 +599,11 @@ minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
        info->flags |= mi->tx_flags;
        sample_idx = minstrel_get_sample_rate(mp, mi);
        if (sample_idx >= 0) {
+               sample = true;
                minstrel_ht_set_rate(mp, mi, &ar[0], sample_idx,
                        txrc, true, false);
                minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate,
-                       txrc, false, true);
+                       txrc, false, false);
                info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
        } else {
                minstrel_ht_set_rate(mp, mi, &ar[0], mi->max_tp_rate,
@@ -607,7 +611,7 @@ minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
                minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate2,
                        txrc, false, true);
        }
-       minstrel_ht_set_rate(mp, mi, &ar[2], mi->max_prob_rate, txrc, false, true);
+       minstrel_ht_set_rate(mp, mi, &ar[2], mi->max_prob_rate, txrc, false, !sample);
 
        ar[3].count = 0;
        ar[3].idx = -1;