netdev - [PATCH net-next 1/5] bridge: vlan: adjust rhashtable initial size and hash locks size

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Date:	Wed, 30 Sep 2015 20:16:51 +0200
From:	Nikolay Aleksandrov <razor@...ckwall.org>
To:	netdev@...r.kernel.org
Cc:	roopa@...ulusnetworks.com, vyasevich@...il.com,
	stephen@...workplumber.org, bridge@...ts.linux-foundation.org,
	davem@...emloft.net,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Subject: [PATCH net-next 1/5] bridge: vlan: adjust rhashtable initial size and hash locks size

From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

As Stephen pointed out the default initial size is more than we need, so
let's start small (4 elements, thus nelem_hint = 3). Also limit the hash
locks to the number of CPUs as we don't need any write-side scaling and
this looks like the minimum.

Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
---
 net/bridge/br_vlan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index e227164bc3e1..283d012c3d89 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -19,6 +19,8 @@ static const struct rhashtable_params br_vlan_rht_params = {
 	.head_offset = offsetof(struct net_bridge_vlan, vnode),
 	.key_offset = offsetof(struct net_bridge_vlan, vid),
 	.key_len = sizeof(u16),
+	.nelem_hint = 3,
+	.locks_mul = 1,
 	.max_size = VLAN_N_VID,
 	.obj_cmpfn = br_vlan_cmp,
 	.automatic_shrinking = true,
-- 
2.4.3

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