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37752336bd
Completely redesign the rate sampling approach Signed-off-by: Felix Fietkau <nbd@nbd.name>
103 lines
3.1 KiB
Diff
103 lines
3.1 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 22 Jan 2021 19:24:59 +0100
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Subject: [PATCH] mac80211: minstrel_ht: reduce the need to sample slower
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rates
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In order to more gracefully be able to fall back to lower rates without too
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much throughput fluctuations, initialize all untested rates below tested ones
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to the maximum probabilty of higher rates.
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Usually this leads to untested lower rates getting initialized with a
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probability value of 100%, making them better candidates for fallback without
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having to rely on random probing
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/mac80211/rc80211_minstrel_ht.c
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+++ b/net/mac80211/rc80211_minstrel_ht.c
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@@ -791,14 +791,11 @@ minstrel_ht_calc_rate_stats(struct minst
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unsigned int cur_prob;
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if (unlikely(mrs->attempts > 0)) {
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- mrs->sample_skipped = 0;
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cur_prob = MINSTREL_FRAC(mrs->success, mrs->attempts);
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minstrel_filter_avg_add(&mrs->prob_avg,
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&mrs->prob_avg_1, cur_prob);
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mrs->att_hist += mrs->attempts;
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mrs->succ_hist += mrs->success;
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- } else {
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- mrs->sample_skipped++;
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}
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mrs->last_success = mrs->success;
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@@ -851,7 +848,6 @@ minstrel_ht_update_stats(struct minstrel
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mi->ampdu_packets = 0;
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}
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- mi->sample_slow = 0;
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mi->sample_count = 0;
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memset(tmp_mcs_tp_rate, 0, sizeof(tmp_mcs_tp_rate));
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@@ -883,6 +879,7 @@ minstrel_ht_update_stats(struct minstrel
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/* Find best rate sets within all MCS groups*/
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for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
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u16 *tp_rate = tmp_mcs_tp_rate;
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+ u16 last_prob = 0;
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mg = &mi->groups[group];
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if (!mi->supported[group])
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@@ -897,7 +894,7 @@ minstrel_ht_update_stats(struct minstrel
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if (group == MINSTREL_CCK_GROUP && ht_supported)
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tp_rate = tmp_legacy_tp_rate;
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- for (i = 0; i < MCS_GROUP_RATES; i++) {
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+ for (i = MCS_GROUP_RATES - 1; i >= 0; i--) {
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if (!(mi->supported[group] & BIT(i)))
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continue;
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@@ -906,6 +903,11 @@ minstrel_ht_update_stats(struct minstrel
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mrs = &mg->rates[i];
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mrs->retry_updated = false;
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minstrel_ht_calc_rate_stats(mp, mrs);
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+
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+ if (mrs->att_hist)
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+ last_prob = max(last_prob, mrs->prob_avg);
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+ else
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+ mrs->prob_avg = max(last_prob, mrs->prob_avg);
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cur_prob = mrs->prob_avg;
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if (minstrel_ht_get_tp_avg(mi, group, i, cur_prob) == 0)
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@@ -1470,13 +1472,9 @@ minstrel_get_sample_rate(struct minstrel
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if (sample_dur >= minstrel_get_duration(tp_rate2) &&
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(cur_max_tp_streams - 1 <
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minstrel_mcs_groups[sample_group].streams ||
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- sample_dur >= minstrel_get_duration(mi->max_prob_rate))) {
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- if (mrs->sample_skipped < 20)
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+ sample_dur >= minstrel_get_duration(mi->max_prob_rate)))
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return -1;
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- if (mi->sample_slow++ > 2)
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- return -1;
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- }
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mi->sample_tries--;
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return sample_idx;
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--- a/net/mac80211/rc80211_minstrel_ht.h
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+++ b/net/mac80211/rc80211_minstrel_ht.h
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@@ -123,7 +123,6 @@ struct minstrel_rate_stats {
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u8 retry_count;
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u8 retry_count_rtscts;
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- u8 sample_skipped;
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bool retry_updated;
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};
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@@ -179,7 +178,6 @@ struct minstrel_ht_sta {
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u8 sample_wait;
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u8 sample_tries;
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u8 sample_count;
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- u8 sample_slow;
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enum minstrel_sample_mode sample_mode;
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u16 sample_rate;
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