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-rw-r--r--package/mac80211/patches/426-minstrel_performance.patch100
1 files changed, 100 insertions, 0 deletions
diff --git a/package/mac80211/patches/426-minstrel_performance.patch b/package/mac80211/patches/426-minstrel_performance.patch
new file mode 100644
index 0000000000..7b95163c6c
--- /dev/null
+++ b/package/mac80211/patches/426-minstrel_performance.patch
@@ -0,0 +1,100 @@
+This patch enhances minstrel's performance for non-MRR setups,
+by preventing it from sampling slower rates with >95% success
+probability and by putting at least 1 non-sample frame between
+several sample frames.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+
+--- a/net/mac80211/rc80211_minstrel.c
++++ b/net/mac80211/rc80211_minstrel.c
+@@ -126,7 +126,9 @@ minstrel_update_stats(struct minstrel_pr
+ mr->adjusted_retry_count = mr->retry_count >> 1;
+ if (mr->adjusted_retry_count > 2)
+ mr->adjusted_retry_count = 2;
++ mr->sample_limit = 4;
+ } else {
++ mr->sample_limit = -1;
+ mr->adjusted_retry_count = mr->retry_count;
+ }
+ if (!mr->adjusted_retry_count)
+@@ -265,7 +267,8 @@ minstrel_get_rate(void *priv, struct iee
+ (mi->sample_count + mi->sample_deferred / 2);
+
+ /* delta > 0: sampling required */
+- if (delta > 0) {
++ if ((delta > 0) && (mrr || !mi->prev_sample)) {
++ struct minstrel_rate *msr;
+ if (mi->packet_count >= 10000) {
+ mi->sample_deferred = 0;
+ mi->sample_count = 0;
+@@ -284,13 +287,20 @@ minstrel_get_rate(void *priv, struct iee
+ }
+
+ sample_ndx = minstrel_get_next_sample(mi);
++ msr = &mi->r[sample_ndx];
+ sample = true;
+- sample_slower = mrr && (mi->r[sample_ndx].perfect_tx_time >
++ sample_slower = mrr && (msr->perfect_tx_time >
+ mi->r[ndx].perfect_tx_time);
+
+ if (!sample_slower) {
+- ndx = sample_ndx;
+- mi->sample_count++;
++ if (msr->sample_limit != 0) {
++ ndx = sample_ndx;
++ mi->sample_count++;
++ if (msr->sample_limit > 0)
++ msr->sample_limit--;
++ } else {
++ sample = false;
++ }
+ } else {
+ /* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark
+ * packets that have the sampling rate deferred to the
+@@ -302,10 +312,20 @@ minstrel_get_rate(void *priv, struct iee
+ mi->sample_deferred++;
+ }
+ }
++ mi->prev_sample = sample;
++
++ /* If we're not using MRR and the sampling rate already
++ * has a probability of >95%, we shouldn't be attempting
++ * to use it, as this only wastes precious airtime */
++ if (!mrr && sample && (mi->r[ndx].probability > 17100))
++ ndx = mi->max_tp_rate;
++
+ ar[0].idx = mi->r[ndx].rix;
+ ar[0].count = minstrel_get_retry_count(&mi->r[ndx], info);
+
+ if (!mrr) {
++ if (!sample)
++ ar[0].count = mp->max_retry;
+ ar[1].idx = mi->lowest_rix;
+ ar[1].count = mp->max_retry;
+ return;
+@@ -401,6 +421,7 @@ minstrel_rate_init(void *priv, struct ie
+
+ /* calculate maximum number of retransmissions before
+ * fallback (based on maximum segment size) */
++ mr->sample_limit = -1;
+ mr->retry_count = 1;
+ mr->retry_count_cts = 1;
+ mr->retry_count_rtscts = 1;
+--- a/net/mac80211/rc80211_minstrel.h
++++ b/net/mac80211/rc80211_minstrel.h
+@@ -16,6 +16,7 @@ struct minstrel_rate {
+ unsigned int perfect_tx_time;
+ unsigned int ack_time;
+
++ int sample_limit;
+ unsigned int retry_count;
+ unsigned int retry_count_cts;
+ unsigned int retry_count_rtscts;
+@@ -57,6 +58,7 @@ struct minstrel_sta_info {
+
+ int n_rates;
+ struct minstrel_rate *r;
++ bool prev_sample;
+
+ /* sampling table */
+ u8 *sample_table;