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mac80211: minstrel_ht: reduce unnecessary rate probing attempts

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On hardware with static fallback tables (e.g. mt76x2), rate probing attempts
can be very expensive.
On such devices, avoid sampling rates slower than the per-group max throughput
rate, based on the assumption that the fallback table will take care of probing
lower rates within that group if the higher rates fail.

To further reduce unnecessary probing attempts, skip duplicate attempts on
rates slower than the max throughput rate.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20190820095449.45255-2-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2019-08-20 11:54:47 +02:00 committed by Johannes Berg
parent 56dd918ff0
commit f793c7eedd
1 changed files with 15 additions and 0 deletions
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15
net/mac80211/rc80211_minstrel_ht.c
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@ -1059,6 +1059,21 @@ minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
minstrel_get_duration(mi->max_prob_rate) * 3 < sample_dur)
return -1;
/*
* For devices with no configurable multi-rate retry, skip sampling
* below the per-group max throughput rate, and only use one sampling
* attempt per rate
*/
if (mp->hw->max_rates == 1 &&
(minstrel_get_duration(mg->max_group_tp_rate[0]) < sample_dur ||
mrs->attempts))
return -1;
/* Skip already sampled slow rates */
if (sample_dur >= minstrel_get_duration(tp_rate1) && mrs->attempts)
return -1;
/*
* Make sure that lower rates get sampled only occasionally,
* if the link is working perfectly.