From: Eric Dumazet <eric.dumazet@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: netdev <netdev@vger.kernel.org>
Subject: [PATCH net-next-2.6] sit: enable lockless xmits
Date: Tue, 28 Sep 2010 14:53:41 +0200 [thread overview]
Message-ID: <1285678421.3154.56.camel@edumazet-laptop> (raw)
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>
---
net/ipv6/sit.c | 1 +
1 files changed, 1 insertion(+)
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 011ecf5..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)
next reply other threads:[~2010-09-28 12:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-28 12:53 Eric Dumazet [this message]
2010-09-29 20:27 ` [PATCH net-next-2.6] sit: enable lockless xmits David Miller
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