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authorEric Dumazet <eric.dumazet@gmail.com>2010-09-28 02:17:17 +0200
committerDavid S. Miller <davem@davemloft.net>2010-09-29 22:25:44 +0200
commit153f0943382e9ae0bff7caa110a1a4656088d0d4 (patch)
tree13e8757f7347d70ad6752622309df20b00fa6f05 /net
parentip_gre: lockless xmit (diff)
downloadlinux-153f0943382e9ae0bff7caa110a1a4656088d0d4.tar.xz
linux-153f0943382e9ae0bff7caa110a1a4656088d0d4.zip
ipip: enable lockless xmits
IPIP 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 ipip tunnel (size:200 bytes per frame) Before patch : real 2m53.321s user 0m10.277s sys 46m0.597s After patch: real 0m32.063s user 0m9.237s sys 8m16.255s Last problem to solve is the contention on dst : 16118.00 28.3% __ip_route_output_key vmlinux 6135.00 10.8% dst_release vmlinux 3220.00 5.6% ip_finish_output vmlinux 2149.00 3.8% ip_route_output_flow vmlinux 1575.00 2.8% ip_append_data vmlinux 1481.00 2.6% ip_push_pending_frames vmlinux 1349.00 2.4% __xfrm_lookup vmlinux 1216.00 2.1% csum_partial_copy_generic vmlinux 1208.00 2.1% udp_sendmsg vmlinux Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ipip.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 9e78f11da786..6ad46c28ede2 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -767,6 +767,7 @@ static void ipip_tunnel_setup(struct net_device *dev)
dev->iflink = 0;
dev->addr_len = 4;
dev->features |= NETIF_F_NETNS_LOCAL;
+ dev->features |= NETIF_F_LLTX;
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
}