Commit 1214628c authored by Nikolay Aleksandrov's avatar Nikolay Aleksandrov Committed by David S. Miller

bridge: move write-heavy fdb members in their own cache line

Fdb's used and updated fields are written to on every packet forward and
packet receive respectively. Thus if we are receiving packets from a
particular fdb, they'll cause false-sharing with everyone who has looked
it up (even if it didn't match, since mac/vid share cache line!). The
"used" field is even worse since it is updated on every packet forward
to that fdb, thus the standard config where X ports use a single gateway
results in 100% fdb false-sharing. Note that this patch does not prevent
the last scenario, but it makes it better for other bridge participants
which are not using that fdb (and are only doing lookups over it).
The point is with this move we make sure that only communicating parties
get the false-sharing, in a later patch we'll show how to avoid that too.
Signed-off-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f7cdee8a
...@@ -160,19 +160,21 @@ struct net_bridge_vlan_group { ...@@ -160,19 +160,21 @@ struct net_bridge_vlan_group {
u16 pvid; u16 pvid;
}; };
struct net_bridge_fdb_entry struct net_bridge_fdb_entry {
{
struct hlist_node hlist; struct hlist_node hlist;
struct net_bridge_port *dst; struct net_bridge_port *dst;
unsigned long updated;
unsigned long used;
mac_addr addr; mac_addr addr;
__u16 vlan_id; __u16 vlan_id;
unsigned char is_local:1, unsigned char is_local:1,
is_static:1, is_static:1,
added_by_user:1, added_by_user:1,
added_by_external_learn:1; added_by_external_learn:1;
/* write-heavy members should not affect lookups */
unsigned long updated ____cacheline_aligned_in_smp;
unsigned long used;
struct rcu_head rcu; struct rcu_head rcu;
}; };
......
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