31 lines
1.2 KiB
Diff
31 lines
1.2 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Sat, 6 Feb 2021 16:08:01 +0100
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Subject: [PATCH] mac80211: minstrel_ht: reduce fluctuations in rate
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probability stats
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In some scenarios when there is a lot of fluctuation in packet error rates,
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rate switching can be amplified when the statistics get skewed by time slots
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with very few tries.
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Make the input data to the moving average more smooth by adding the
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success/attempts count from the last stats window as well. This has the
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advantage of smoothing the data without introducing any extra lag to sampling
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rates.
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This significantly improves rate stability on a strong test link subjected to
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periodic noise bursts generated with a SDR
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/mac80211/rc80211_minstrel_ht.c
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+++ b/net/mac80211/rc80211_minstrel_ht.c
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@@ -700,7 +700,8 @@ minstrel_ht_calc_rate_stats(struct minst
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unsigned int cur_prob;
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if (unlikely(mrs->attempts > 0)) {
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- cur_prob = MINSTREL_FRAC(mrs->success, mrs->attempts);
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+ cur_prob = MINSTREL_FRAC(mrs->success + mrs->last_success,
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+ mrs->attempts + mrs->last_attempts);
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minstrel_filter_avg_add(&mrs->prob_avg,
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&mrs->prob_avg_1, cur_prob);
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mrs->att_hist += mrs->attempts;
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