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net: increase sk_[max_]ack_backlog 

sk_ack_backlog & sk_max_ack_backlog were 16bit fields, meaning
listen() backlog was limited to 65535.

It is time to increase the width to allow much bigger backlog,
if admins change /proc/sys/net/core/somaxconn &
/proc/sys/net/ipv4/tcp_max_syn_backlog default values.

Tested:

echo 5000000 >/proc/sys/net/core/somaxconn
echo 5000000 >/proc/sys/net/ipv4/tcp_max_syn_backlog

Ran a SYNFLOOD test against a listener using listen(fd, 5000000)

myhost~# grep request_sock_TCP /proc/slabinfo
request_sock_TCP  4185642 4411940    304   13    1 : tunables   54   27    8 : slabdata 339380 339380      0

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-03-19 19:04:21 -07:00 committed by David S. Miller
parent fa76ce7328
commit becb74f0ac
2 changed files with 2 additions and 4 deletions
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4
include/net/sock.h
View File

@ -405,8 +405,8 @@ struct sock {
rwlock_t sk_callback_lock;
int sk_err,
sk_err_soft;
unsigned short sk_ack_backlog;
unsigned short sk_max_ack_backlog;
u32 sk_ack_backlog;
u32 sk_max_ack_backlog;
__u32 sk_priority;
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
__u32 sk_cgrp_prioidx;

2
net/core/sysctl_net_core.c
View File

@ -24,7 +24,6 @@
static int zero = 0;
static int one = 1;
static int ushort_max = USHRT_MAX;
static int net_msg_warn; /* Unused, but still a sysctl */
@ -401,7 +400,6 @@ static struct ctl_table netns_core_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.extra1 = &zero,
.extra2 = &ushort_max,
.proc_handler = proc_dointvec_minmax
},
{ }