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mac80211/minstrel_ht: avoid useless sampling of high-probability slower rates 

Slow rates that have >95% success probability do not need to be
monitored continuously. When the channel conditions change rapidly, the
slow sampling results are useless anyway. When conditions change slowly,
they will be monitored by gradual downgrading of the actively used
rates. This patch slightly improves throughput under good conditions.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2013-03-16 17:00:26 +01:00 committed by Johannes Berg
parent 3e8b1eb21c
commit bc96f24266
1 changed files with 3 additions and 3 deletions
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6
net/mac80211/rc80211_minstrel_ht.c
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@ -653,10 +653,10 @@ minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
if (sample_idx == mi->max_tp_rate)
return -1;
/*
* When not using MRR, 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%
* to avoid wasting airtime.
*/
if (!mp->has_mrr && (mr->probability > MINSTREL_FRAC(95, 100)))
if (mr->probability > MINSTREL_FRAC(95, 100))
return -1;
/*