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62 lines
1.9 KiB
Diff
62 lines
1.9 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Sat, 28 Sep 2019 15:44:06 +0200
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Subject: [PATCH] mac80211: minstrel: remove divisions in tx status path
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Use a slightly different threshold for downgrading spatial streams to
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make it easier to calculate without divisions.
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Slightly reduces CPU overhead.
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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.c
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+++ b/net/mac80211/rc80211_minstrel.c
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@@ -289,8 +289,7 @@ minstrel_tx_status(void *priv, struct ie
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if (mi->sample_deferred > 0)
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mi->sample_deferred--;
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- if (time_after(jiffies, mi->last_stats_update +
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- (mp->update_interval * HZ) / 1000))
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+ if (time_after(jiffies, mi->last_stats_update + mp->update_interval))
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minstrel_update_stats(mp, mi);
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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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@@ -970,23 +970,21 @@ minstrel_ht_tx_status(void *priv, struct
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*/
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rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]);
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if (rate->attempts > 30 &&
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- MINSTREL_FRAC(rate->success, rate->attempts) <
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- MINSTREL_FRAC(20, 100)) {
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+ rate->success < rate->attempts / 4) {
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minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true);
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update = true;
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}
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rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]);
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if (rate2->attempts > 30 &&
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- MINSTREL_FRAC(rate2->success, rate2->attempts) <
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- MINSTREL_FRAC(20, 100)) {
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+ rate2->success < rate2->attempts / 4) {
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minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false);
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update = true;
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}
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}
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if (time_after(jiffies, mi->last_stats_update +
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- (mp->update_interval / 2 * HZ) / 1000)) {
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+ mp->update_interval / 2)) {
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update = true;
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minstrel_ht_update_stats(mp, mi, true);
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}
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@@ -1666,7 +1664,7 @@ minstrel_ht_alloc(struct ieee80211_hw *h
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mp->has_mrr = true;
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mp->hw = hw;
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- mp->update_interval = 100;
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+ mp->update_interval = HZ / 10;
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#ifdef CPTCFG_MAC80211_DEBUGFS
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mp->fixed_rate_idx = (u32) -1;
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