package/kernel/mac80211/patches/subsys/340-mac80211-minstrel_ht-remove-old-ewma-based-rate-aver.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Sat, 26 Dec 2020 14:34:30 +0100
   3 Subject: [PATCH] mac80211: minstrel_ht: remove old ewma based rate average
   4  code
   5
   6 The new noise filter has been the default for a while now with no reported
   7 downside and significant improvement compared to the old code.
   8
   9 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  10 ---
  11
  12 --- a/net/mac80211/rc80211_minstrel_ht.c
  13 +++ b/net/mac80211/rc80211_minstrel_ht.c
  14 @@ -769,17 +769,8 @@ minstrel_ht_calc_rate_stats(struct minst
  15         if (unlikely(mrs->attempts > 0)) {
  16                 mrs->sample_skipped = 0;
  17                 cur_prob = MINSTREL_FRAC(mrs->success, mrs->attempts);
  18 -               if (mp->new_avg) {
  19 -                       minstrel_filter_avg_add(&mrs->prob_avg,
  20 -                                               &mrs->prob_avg_1, cur_prob);
  21 -               } else if (unlikely(!mrs->att_hist)) {
  22 -                       mrs->prob_avg = cur_prob;
  23 -               } else {
  24 -                       /*update exponential weighted moving avarage */
  25 -                       mrs->prob_avg = minstrel_ewma(mrs->prob_avg,
  26 -                                                     cur_prob,
  27 -                                                     EWMA_LEVEL);
  28 -               }
  29 +               minstrel_filter_avg_add(&mrs->prob_avg,
  30 +                                       &mrs->prob_avg_1, cur_prob);
  31                 mrs->att_hist += mrs->attempts;
  32                 mrs->succ_hist += mrs->success;
  33         } else {
  34 @@ -913,10 +904,8 @@ minstrel_ht_update_stats(struct minstrel
  35         /* Try to increase robustness of max_prob_rate*/
  36         minstrel_ht_prob_rate_reduce_streams(mi);
  37
  38 -       /* try to sample all available rates during each interval */
  39 -       mi->sample_count *= 8;
  40 -       if (mp->new_avg)
  41 -               mi->sample_count /= 2;
  42 +       /* try to sample half of all available rates during each interval */
  43 +       mi->sample_count *= 4;
  44
  45         if (sample)
  46                 minstrel_ht_rate_sample_switch(mp, mi);
  47 @@ -1040,7 +1029,7 @@ minstrel_ht_tx_status(void *priv, struct
  48         struct ieee80211_tx_rate *ar = info->status.rates;
  49         struct minstrel_rate_stats *rate, *rate2, *rate_sample = NULL;
  50         struct minstrel_priv *mp = priv;
  51 -       u32 update_interval = mp->update_interval / 2;
  52 +       u32 update_interval = mp->update_interval;
  53         bool last, update = false;
  54         bool sample_status = false;
  55         int i;
  56 @@ -1090,9 +1079,8 @@ minstrel_ht_tx_status(void *priv, struct
  57
  58         switch (mi->sample_mode) {
  59         case MINSTREL_SAMPLE_IDLE:
  60 -               if (mp->new_avg &&
  61 -                   (mp->hw->max_rates > 1 ||
  62 -                    mi->total_packets_cur < SAMPLE_SWITCH_THR))
  63 +               if (mp->hw->max_rates > 1 ||
  64 +                    mi->total_packets_cur < SAMPLE_SWITCH_THR)
  65                         update_interval /= 2;
  66                 break;
  67
  68 @@ -1832,8 +1820,7 @@ minstrel_ht_alloc(struct ieee80211_hw *h
  69                 mp->has_mrr = true;
  70
  71         mp->hw = hw;
  72 -       mp->update_interval = HZ / 10;
  73 -       mp->new_avg = true;
  74 +       mp->update_interval = HZ / 20;
  75
  76         minstrel_ht_init_cck_rates(mp);
  77         for (i = 0; i < ARRAY_SIZE(mp->hw->wiphy->bands); i++)
  78 @@ -1853,8 +1840,6 @@ static void minstrel_ht_add_debugfs(stru
  79                            &mp->fixed_rate_idx);
  80         debugfs_create_u32("sample_switch", S_IRUGO | S_IWUSR, debugfsdir,
  81                            &mp->sample_switch);
  82 -       debugfs_create_bool("new_avg", S_IRUGO | S_IWUSR, debugfsdir,
  83 -                          &mp->new_avg);
  84  }
  85  #endif
  86
  87 --- a/net/mac80211/rc80211_minstrel_ht.h
  88 +++ b/net/mac80211/rc80211_minstrel_ht.h
  89 @@ -60,7 +60,6 @@
  90  struct minstrel_priv {
  91         struct ieee80211_hw *hw;
  92         bool has_mrr;
  93 -       bool new_avg;
  94         u32 sample_switch;
  95         unsigned int cw_min;
  96         unsigned int cw_max;