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authorNikolay Aleksandrov <nikolay@cumulusnetworks.com>2017-12-12 16:02:50 +0200
committerDavid S. Miller <davem@davemloft.net>2017-12-13 15:10:01 -0500
commiteb7935830d00b9e0c4ca11382143ea2320eb45c2 (patch)
tree6c8b4dc2c703782f291b8a527303fcecb0945c8f /net/bridge/br_device.c
parentnet: phy: marvell10g: remove XGMII as an option for 88x3310 (diff)
downloadlinux-dev-eb7935830d00b9e0c4ca11382143ea2320eb45c2.tar.xz
linux-dev-eb7935830d00b9e0c4ca11382143ea2320eb45c2.zip
net: bridge: use rhashtable for fdbs
Before this patch the bridge used a fixed 256 element hash table which was fine for small use cases (in my tests it starts to degrade above 1000 entries), but it wasn't enough for medium or large scale deployments. Modern setups have thousands of participants in a single bridge, even only enabling vlans and adding a few thousand vlan entries will cause a few thousand fdbs to be automatically inserted per participating port. So we need to scale the fdb table considerably to cope with modern workloads, and this patch converts it to use a rhashtable for its operations thus improving the bridge scalability. Tests show the following results (10 runs each), at up to 1000 entries rhashtable is ~3% slower, at 2000 rhashtable is 30% faster, at 3000 it is 2 times faster and at 30000 it is 50 times faster. Obviously this happens because of the properties of the two constructs and is expected, rhashtable keeps pretty much a constant time even with 10000000 entries (tested), while the fixed hash table struggles considerably even above 10000. As a side effect this also reduces the net_bridge struct size from 3248 bytes to 1344 bytes. Also note that the key struct is 8 bytes. Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_device.c')
-rw-r--r--net/bridge/br_device.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index af5b8c87f590..1285ca30ab0a 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -125,9 +125,16 @@ static int br_dev_init(struct net_device *dev)
if (!br->stats)
return -ENOMEM;
+ err = br_fdb_hash_init(br);
+ if (err) {
+ free_percpu(br->stats);
+ return err;
+ }
+
err = br_vlan_init(br);
if (err) {
free_percpu(br->stats);
+ br_fdb_hash_fini(br);
return err;
}
@@ -135,6 +142,7 @@ static int br_dev_init(struct net_device *dev)
if (err) {
free_percpu(br->stats);
br_vlan_flush(br);
+ br_fdb_hash_fini(br);
}
br_set_lockdep_class(dev);
@@ -148,6 +156,7 @@ static void br_dev_uninit(struct net_device *dev)
br_multicast_dev_del(br);
br_multicast_uninit_stats(br);
br_vlan_flush(br);
+ br_fdb_hash_fini(br);
free_percpu(br->stats);
}
@@ -416,6 +425,7 @@ void br_dev_setup(struct net_device *dev)
br->dev = dev;
spin_lock_init(&br->lock);
INIT_LIST_HEAD(&br->port_list);
+ INIT_HLIST_HEAD(&br->fdb_list);
spin_lock_init(&br->hash_lock);
br->bridge_id.prio[0] = 0x80;