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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>
This commit is contained in:
Felix Fietkau 2018-10-06 19:35:06 +02:00 committed by Johannes Berg
parent 972b66b86f
commit f4ec7cb0f9
1 changed files with 6 additions and 4 deletions
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10
net/mac80211/rc80211_minstrel_ht.c
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@ -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 ||