Commit 83a718d6 authored Feb 04, 2017 by Nikolay Aleksandrov Committed by David S. Miller Feb 06, 2017

bridge: fdb: write to used and updated at most once per jiffy

Writing once per jiffy is enough to limit the bridge's false sharing.
After this change the bridge doesn't show up in the local load HitM stats.

Suggested-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 1214628c

net/bridge/br_fdb.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -597,6 +597,7 @@ void br_fdb_update(struct net_bridge br, struct net_bridge_port source,
		fdb->dst = source;
		fdb_modified = true;
		}
		if (jiffies != fdb->updated)
		fdb->updated = jiffies;
		if (unlikely(added_by_user))
		fdb->added_by_user = 1;

net/bridge/br_input.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -198,6 +198,7 @@ int br_handle_frame_finish(struct net net, struct sock sk, struct sk_buff *skb
		if (dst->is_local)
		return br_pass_frame_up(skb);

		if (jiffies != dst->used)
		dst->used = jiffies;
		br_forward(dst->dst, skb, local_rcv, false);
		} else {