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authorTom Herbert <therbert@google.com>2014-07-02 06:32:17 +0200
committerDavid S. Miller <davem@davemloft.net>2014-07-08 06:14:21 +0200
commitb73c3d0e4f0e1961e15bec18720e48aabebe2109 (patch)
tree84bba82f2bb8dda790d4cea90eb698a5442d36b4 /net/ipv6/tcp_ipv6.c
parentflow_dissector: Abstract out hash computation (diff)
downloadlinux-b73c3d0e4f0e1961e15bec18720e48aabebe2109.tar.xz
linux-b73c3d0e4f0e1961e15bec18720e48aabebe2109.zip
net: Save TX flow hash in sock and set in skbuf on xmit
For a connected socket we can precompute the flow hash for setting in skb->hash on output. This is a performance advantage over calculating the skb->hash for every packet on the connection. The computation is done using the common hash algorithm to be consistent with computations done for packets of the connection in other states where thers is no socket (e.g. time-wait, syn-recv, syn-cookies). This patch adds sk_txhash to the sock structure. inet_set_txhash and ip6_set_txhash functions are added which are called from points in TCP and UDP where socket moves to established state. skb_set_hash_from_sk is a function which sets skb->hash from the sock txhash value. This is called in UDP and TCP transmit path when transmitting within the context of a socket. Tested: ran super_netperf with 200 TCP_RR streams over a vxlan interface (in this case skb_get_hash called on every TX packet to create a UDP source port). Before fix: 95.02% CPU utilization 154/256/505 90/95/99% latencies 1.13042e+06 tps Time in functions: 0.28% skb_flow_dissect 0.21% __skb_get_hash After fix: 94.95% CPU utilization 156/254/485 90/95/99% latencies 1.15447e+06 Neither __skb_get_hash nor skb_flow_dissect appear in perf Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
-rw-r--r--net/ipv6/tcp_ipv6.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index a97c95585da8..22055b098428 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -198,6 +198,8 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
sk->sk_v6_daddr = usin->sin6_addr;
np->flow_label = fl6.flowlabel;
+ ip6_set_txhash(sk);
+
/*
* TCP over IPv4
*/
@@ -1132,6 +1134,8 @@ static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
newsk->sk_bound_dev_if = ireq->ir_iif;
+ ip6_set_txhash(newsk);
+
/* Now IPv6 options...
First: no IPv4 options.