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mac80211: rc80211_minstrel: remove variance / stddev calculation

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When there are few packets (e.g. for sampling attempts), the exponentially
weighted variance is usually vastly overestimated, making the resulting data
essentially useless. As far as I know, there has not been any practical use
for this, so let's not waste any cycles on it.

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 19:35:07 +02:00
committed by Johannes Berg
parent f4ec7cb0f9
commit 506dbf90c1
4 changed files with 9 additions and 51 deletions
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6
net/mac80211/rc80211_minstrel.c
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@@ -167,12 +167,6 @@ minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs)
if (unlikely(!mrs->att_hist)) {
mrs->prob_ewma = cur_prob;
} else {
/* update exponential weighted moving variance */
mrs->prob_ewmv = minstrel_ewmv(mrs->prob_ewmv,
cur_prob,
mrs->prob_ewma,
EWMA_LEVEL);
/*update exponential weighted moving avarage */
mrs->prob_ewma = minstrel_ewma(mrs->prob_ewma,
cur_prob,