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Commit a8d418d9 authored by Julan Hsu's avatar Julan Hsu Committed by Johannes Berg
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mac80211: mesh: only switch path when new metric is at least 10% better



This helps to reduce frequent path switches when multiple path
candidates have the same or very similar path metrics.

Signed-off-by: default avatarJulan Hsu <julanhsu@google.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 67fc0554
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+8 −3
Original line number Diff line number Diff line
@@ -447,7 +447,10 @@ static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
			    (mpath->flags & MESH_PATH_SN_VALID)) {
				if (SN_GT(mpath->sn, orig_sn) ||
				    (mpath->sn == orig_sn &&
				     new_metric >= mpath->metric)) {
				     (rcu_access_pointer(mpath->next_hop) !=
						      sta ?
					      mult_frac(new_metric, 10, 9) :
					      new_metric) >= mpath->metric)) {
					process = false;
					fresh_info = false;
				}
@@ -516,7 +519,9 @@ static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
			spin_lock_bh(&mpath->state_lock);
			if ((mpath->flags & MESH_PATH_FIXED) ||
			    ((mpath->flags & MESH_PATH_ACTIVE) &&
					(last_hop_metric > mpath->metric)))
			     ((rcu_access_pointer(mpath->next_hop) != sta ?
				       mult_frac(last_hop_metric, 10, 9) :
				       last_hop_metric) > mpath->metric)))
				fresh_info = false;
		} else {
			mpath = mesh_path_add(sdata, ta);