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authorFelix Fietkau <nbd@nbd.name>2018-10-06 19:35:06 +0200
committerJohannes Berg <johannes.berg@intel.com>2018-10-11 16:01:04 +0200
commitf4ec7cb0f9ea65a7622b001bb48dbac1a7e6ad1e (patch)
treedfbca821de20a45e29ce478b63d97a5272e6cd6e /net/mac80211
parent972b66b86f85f4e8201db454f4c3e9d990cf9836 (diff)
mac80211: minstrel: do not sample rates 3 times slower than max_prob_rate
These rates are highly unlikely to be used quickly, even if the link deteriorates rapidly. This improves throughput in cases where CCK rates are not reliable enough to be skipped entirely during sampling. Sampling these rates regularly can cost a lot of airtime. Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/rc80211_minstrel_ht.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index fdcb4e9b4560..f466ec37d161 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -1004,10 +1004,13 @@ minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
return -1;
/*
- * Do not sample if the probability is already higher than 95%
- * to avoid wasting airtime.
+ * Do not sample if the probability is already higher than 95%,
+ * or if the rate is 3 times slower than the current max probability
+ * rate, to avoid wasting airtime.
*/
- if (mrs->prob_ewma > MINSTREL_FRAC(95, 100))
+ sample_dur = minstrel_get_duration(sample_idx);
+ if (mrs->prob_ewma > MINSTREL_FRAC(95, 100) ||
+ minstrel_get_duration(mi->max_prob_rate) * 3 < sample_dur)
return -1;
/*
@@ -1017,7 +1020,6 @@ minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
cur_max_tp_streams = minstrel_mcs_groups[tp_rate1 /
MCS_GROUP_RATES].streams;
- sample_dur = minstrel_get_duration(sample_idx);
if (sample_dur >= minstrel_get_duration(tp_rate2) &&
(cur_max_tp_streams - 1 <
minstrel_mcs_groups[sample_group].streams ||