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43 lines
1.5 KiB
Diff
43 lines
1.5 KiB
Diff
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From: Felix Fietkau <nbd@nbd.name>
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Date: Wed, 5 Jun 2019 20:42:49 +0200
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Subject: [PATCH] mac80211: minstrel_ht: reduce unnecessary rate probing
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attempts
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On hardware with static fallback tables (e.g. mt76x2), rate probing attempts
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can be very expensive.
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On such devices, avoid sampling rates slower than the per-group max throughput
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rate, based on the assumption that the fallback table will take care of probing
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lower rates within that group if the higher rates fail.
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To make this work, this also fixes a wrong initialization in the previously
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unused per-group sorted rate array.
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To further reduce unnecessary probing attempts, skip duplicate attempts on
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rates slower than the max throughput rate.
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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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@@ -1028,6 +1028,21 @@ minstrel_get_sample_rate(struct minstrel
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minstrel_get_duration(mi->max_prob_rate) * 3 < sample_dur)
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return -1;
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+
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+ /*
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+ * For devices with no configurable multi-rate retry, skip sampling
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+ * below the per-group max throughput rate, and only use one sampling
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+ * attempt per rate
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+ */
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+ if (mp->hw->max_rates == 1 &&
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+ (minstrel_get_duration(mg->max_group_tp_rate[0]) < sample_dur ||
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+ mrs->attempts))
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+ return -1;
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+
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+ /* Skip already sampled slow rates */
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+ if (sample_dur >= minstrel_get_duration(tp_rate1) && mrs->attempts)
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+ return -1;
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+
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/*
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* Make sure that lower rates get sampled only occasionally,
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* if the link is working perfectly.
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