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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>
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)