diff options
| author | Eric Dumazet <edumazet@google.com> | 2012-07-19 07:34:03 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-07-19 10:35:30 -0700 |
| commit | be9f4a44e7d41cee50ddb5f038fc2391cbbb4046 (patch) | |
| tree | 184e45a62fa0b4d15961427c0e8d5a496f0617a5 /include/net | |
| parent | aee06da6726d4981c51928c2d6d1e2cabeec7a10 (diff) | |
| download | linux-be9f4a44e7d41cee50ddb5f038fc2391cbbb4046.tar.bz2 | |
ipv4: tcp: remove per net tcp_sock
tcp_v4_send_reset() and tcp_v4_send_ack() use a single socket
per network namespace.
This leads to bad behavior on multiqueue NICS, because many cpus
contend for the socket lock and once socket lock is acquired, extra
false sharing on various socket fields slow down the operations.
To better resist to attacks, we use a percpu socket. Each cpu can
run without contention, using appropriate memory (local node)
Additional features :
1) We also mirror the queue_mapping of the incoming skb, so that
answers use the same queue if possible.
2) Setting SOCK_USE_WRITE_QUEUE socket flag speedup sock_wfree()
3) We now limit the number of in-flight RST/ACK [1] packets
per cpu, instead of per namespace, and we honor the sysctl_wmem_default
limit dynamically. (Prior to this patch, sysctl_wmem_default value was
copied at boot time, so any further change would not affect tcp_sock
limit)
[1] These packets are only generated when no socket was matched for
the incoming packet.
Reported-by: Bill Sommerfeld <wsommerfeld@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/ip.h | 2 | ||||
| -rw-r--r-- | include/net/netns/ipv4.h | 1 |
2 files changed, 1 insertions, 2 deletions
diff --git a/include/net/ip.h b/include/net/ip.h index ec5cfde85e9a..bd5e444a19ce 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -158,7 +158,7 @@ static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; } -void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr, +void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, __be32 saddr, const struct ip_reply_arg *arg, unsigned int len); diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h index 2e089a99d603..d909c7fc3da1 100644 --- a/include/net/netns/ipv4.h +++ b/include/net/netns/ipv4.h @@ -38,7 +38,6 @@ struct netns_ipv4 { struct sock *fibnl; struct sock **icmp_sk; - struct sock *tcp_sock; struct inet_peer_base *peers; struct tcpm_hash_bucket *tcp_metrics_hash; unsigned int tcp_metrics_hash_mask; |