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authorEric Dumazet <eric.dumazet@gmail.com>2010-09-28 02:53:41 +0000
committerDavid S. Miller <davem@davemloft.net>2010-09-29 13:25:37 -0700
commit8df40d1033d64597dcf1efd4f7547e817f7a953b (patch)
treeb6ec7503d4d38c53d1123b184df7acad9a1debe4 /net/ipv6
parentdd4080ee575db1a2d0f40538aed5aa7662a06c54 (diff)
downloadop-kernel-dev-8df40d1033d64597dcf1efd4f7547e817f7a953b.zip
op-kernel-dev-8df40d1033d64597dcf1efd4f7547e817f7a953b.tar.gz
sit: enable lockless xmits
SIT tunnels can benefit from lockless xmits, using NETIF_F_LLTX Bench on a 16 cpus machine (dual E5540 cpus), 16 threads sending 10000000 UDP frames via one sit tunnel (size:220 bytes per frame) Before patch : real 3m15.399s user 0m9.185s sys 51m55.403s 75029.00 87.5% _raw_spin_lock vmlinux 1090.00 1.3% dst_release vmlinux 902.00 1.1% dev_queue_xmit vmlinux 627.00 0.7% sock_wfree vmlinux 613.00 0.7% ip6_push_pending_frames ipv6.ko 505.00 0.6% __ip_route_output_key vmlinux After patch: real 1m1.387s user 0m12.489s sys 15m58.868s 28239.00 23.3% dst_release vmlinux 13570.00 11.2% ip6_push_pending_frames ipv6.ko 13118.00 10.8% ip6_append_data ipv6.ko 7995.00 6.6% __ip_route_output_key vmlinux 7924.00 6.5% sk_dst_check vmlinux 5015.00 4.1% udpv6_sendmsg ipv6.ko 3594.00 3.0% sock_alloc_send_pskb vmlinux 3135.00 2.6% sock_wfree vmlinux 3055.00 2.5% ip6_sk_dst_lookup ipv6.ko 2473.00 2.0% ip_finish_output vmlinux Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/sit.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 2cb6460..d770178 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1140,6 +1140,7 @@ static void ipip6_tunnel_setup(struct net_device *dev)
dev->iflink = 0;
dev->addr_len = 4;
dev->features |= NETIF_F_NETNS_LOCAL;
+ dev->features |= NETIF_F_LLTX;
}
static int ipip6_tunnel_init(struct net_device *dev)
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