diff options
Diffstat (limited to 'package/kernel/mac80211/patches/subsys/354-mac80211-minstrel_ht-reduce-fluctuations-in-rate-pro.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/subsys/354-mac80211-minstrel_ht-reduce-fluctuations-in-rate-pro.patch | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/subsys/354-mac80211-minstrel_ht-reduce-fluctuations-in-rate-pro.patch b/package/kernel/mac80211/patches/subsys/354-mac80211-minstrel_ht-reduce-fluctuations-in-rate-pro.patch new file mode 100644 index 0000000000..16bcbc2ef9 --- /dev/null +++ b/package/kernel/mac80211/patches/subsys/354-mac80211-minstrel_ht-reduce-fluctuations-in-rate-pro.patch @@ -0,0 +1,30 @@ +From: Felix Fietkau <nbd@nbd.name> +Date: Sat, 6 Feb 2021 16:08:01 +0100 +Subject: [PATCH] mac80211: minstrel_ht: reduce fluctuations in rate + probability stats + +In some scenarios when there is a lot of fluctuation in packet error rates, +rate switching can be amplified when the statistics get skewed by time slots +with very few tries. +Make the input data to the moving average more smooth by adding the +success/attempts count from the last stats window as well. This has the +advantage of smoothing the data without introducing any extra lag to sampling +rates. +This significantly improves rate stability on a strong test link subjected to +periodic noise bursts generated with a SDR + +Signed-off-by: Felix Fietkau <nbd@nbd.name> +--- + +--- a/net/mac80211/rc80211_minstrel_ht.c ++++ b/net/mac80211/rc80211_minstrel_ht.c +@@ -700,7 +700,8 @@ minstrel_ht_calc_rate_stats(struct minst + unsigned int cur_prob; + + if (unlikely(mrs->attempts > 0)) { +- cur_prob = MINSTREL_FRAC(mrs->success, mrs->attempts); ++ cur_prob = MINSTREL_FRAC(mrs->success + mrs->last_success, ++ mrs->attempts + mrs->last_attempts); + minstrel_filter_avg_add(&mrs->prob_avg, + &mrs->prob_avg_1, cur_prob); + mrs->att_hist += mrs->attempts; |