Commit 4b1b865e authored Sep 15, 2015 by Eric Dumazet Committed by David S. Miller Sep 17, 2015

bonding: use l4 hash if available



If skb carries a l4 hash, no need to perform a flow dissection.

Performance is slightly better :

lpaa5:~# ./super_netperf 200 -H lpaa6 -t TCP_RR -l 100
2.39012e+06
lpaa5:~# ./super_netperf 200 -H lpaa6 -t TCP_RR -l 100
2.39393e+06
lpaa5:~# ./super_netperf 200 -H lpaa6 -t TCP_RR -l 100
2.39988e+06

After patch :

lpaa5:~# ./super_netperf 200 -H lpaa6 -t TCP_RR -l 100
2.43579e+06
lpaa5:~# ./super_netperf 200 -H lpaa6 -t TCP_RR -l 100
2.44304e+06
lpaa5:~# ./super_netperf 200 -H lpaa6 -t TCP_RR -l 100
2.44312e+06

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tom Herbert <tom@herbertland.com>
Cc: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 58d607d3

drivers/net/bonding/bond_main.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -3136,6 +3136,10 @@ u32 bond_xmit_hash(struct bonding bond, struct sk_buff skb)
		struct flow_keys flow;
		u32 hash;

		if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
		skb->l4_hash)
		return skb->hash;

		if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 \|\|
		!bond_flow_dissect(bond, skb, &flow))
		return bond_eth_hash(skb);