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

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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>
This commit is contained in:
Nikolay Aleksandrov 2017-02-04 18:05:09 +01:00 committed by David S. Miller
parent 1214628cb1
commit 83a718d629
2 changed files with 4 additions and 2 deletions
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3
net/bridge/br_fdb.c
View File

@ -597,7 +597,8 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
fdb->dst = source;
fdb_modified = true;
}
fdb->updated = jiffies;
if (jiffies != fdb->updated)
fdb->updated = jiffies;
if (unlikely(added_by_user))
fdb->added_by_user = 1;
if (unlikely(fdb_modified))

3
net/bridge/br_input.c
View File

@ -198,7 +198,8 @@ 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);
dst->used = jiffies;
if (jiffies != dst->used)
dst->used = jiffies;
br_forward(dst->dst, skb, local_rcv, false);
} else {
if (!mcast_hit)