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101 lines
3.0 KiB
Diff
101 lines
3.0 KiB
Diff
This patch enhances minstrel's performance for non-MRR setups,
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by preventing it from sampling slower rates with >95% success
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probability and by putting at least 1 non-sample frame between
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several sample frames.
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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--- a/net/mac80211/rc80211_minstrel.c
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+++ b/net/mac80211/rc80211_minstrel.c
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@@ -126,7 +126,9 @@ minstrel_update_stats(struct minstrel_pr
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mr->adjusted_retry_count = mr->retry_count >> 1;
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if (mr->adjusted_retry_count > 2)
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mr->adjusted_retry_count = 2;
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+ mr->sample_limit = 4;
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} else {
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+ mr->sample_limit = -1;
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mr->adjusted_retry_count = mr->retry_count;
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}
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if (!mr->adjusted_retry_count)
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@@ -265,7 +267,8 @@ minstrel_get_rate(void *priv, struct iee
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(mi->sample_count + mi->sample_deferred / 2);
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/* delta > 0: sampling required */
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- if (delta > 0) {
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+ if ((delta > 0) && (mrr || !mi->prev_sample)) {
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+ struct minstrel_rate *msr;
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if (mi->packet_count >= 10000) {
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mi->sample_deferred = 0;
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mi->sample_count = 0;
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@@ -284,13 +287,20 @@ minstrel_get_rate(void *priv, struct iee
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}
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sample_ndx = minstrel_get_next_sample(mi);
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+ msr = &mi->r[sample_ndx];
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sample = true;
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- sample_slower = mrr && (mi->r[sample_ndx].perfect_tx_time >
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+ sample_slower = mrr && (msr->perfect_tx_time >
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mi->r[ndx].perfect_tx_time);
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if (!sample_slower) {
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- ndx = sample_ndx;
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- mi->sample_count++;
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+ if (msr->sample_limit != 0) {
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+ ndx = sample_ndx;
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+ mi->sample_count++;
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+ if (msr->sample_limit > 0)
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+ msr->sample_limit--;
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+ } else {
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+ sample = false;
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+ }
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} else {
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/* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark
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* packets that have the sampling rate deferred to the
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@@ -302,10 +312,20 @@ minstrel_get_rate(void *priv, struct iee
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mi->sample_deferred++;
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}
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}
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+ mi->prev_sample = sample;
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+
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+ /* If we're not using MRR and the sampling rate already
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+ * has a probability of >95%, we shouldn't be attempting
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+ * to use it, as this only wastes precious airtime */
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+ if (!mrr && sample && (mi->r[ndx].probability > 17100))
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+ ndx = mi->max_tp_rate;
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+
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ar[0].idx = mi->r[ndx].rix;
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ar[0].count = minstrel_get_retry_count(&mi->r[ndx], info);
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if (!mrr) {
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+ if (!sample)
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+ ar[0].count = mp->max_retry;
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ar[1].idx = mi->lowest_rix;
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ar[1].count = mp->max_retry;
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return;
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@@ -401,6 +421,7 @@ minstrel_rate_init(void *priv, struct ie
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/* calculate maximum number of retransmissions before
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* fallback (based on maximum segment size) */
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+ mr->sample_limit = -1;
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mr->retry_count = 1;
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mr->retry_count_cts = 1;
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mr->retry_count_rtscts = 1;
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--- a/net/mac80211/rc80211_minstrel.h
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+++ b/net/mac80211/rc80211_minstrel.h
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@@ -16,6 +16,7 @@ struct minstrel_rate {
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unsigned int perfect_tx_time;
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unsigned int ack_time;
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+ int sample_limit;
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unsigned int retry_count;
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unsigned int retry_count_cts;
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unsigned int retry_count_rtscts;
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@@ -57,6 +58,7 @@ struct minstrel_sta_info {
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int n_rates;
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struct minstrel_rate *r;
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+ bool prev_sample;
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/* sampling table */
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u8 *sample_table;
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