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ipv4: Namespaceify tcp_max_syn_backlog knob

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Different namespace application might require different maximal
number of remembered connection requests.

Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Haishuang Yan
2016-12-28 17:52:33 +08:00
committed by David S. Miller
parent 1946e672c1
commit fee83d097b
7 changed files with 16 additions and 18 deletions
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7
net/ipv4/tcp_ipv4.c
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@@ -2419,7 +2419,7 @@ static void __net_exit tcp_sk_exit(struct net *net)
static int __net_init tcp_sk_init(struct net *net)
{
int res, cpu;
int res, cpu, cnt;
net->ipv4.tcp_sk = alloc_percpu(struct sock *);
if (!net->ipv4.tcp_sk)
@@ -2458,10 +2458,13 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.sysctl_tcp_notsent_lowat = UINT_MAX;
net->ipv4.sysctl_tcp_tw_reuse = 0;
cnt = tcp_hashinfo.ehash_mask + 1;
net->ipv4.tcp_death_row.sysctl_tw_recycle = 0;
net->ipv4.tcp_death_row.sysctl_max_tw_buckets = (tcp_hashinfo.ehash_mask + 1) / 2;
net->ipv4.tcp_death_row.sysctl_max_tw_buckets = (cnt + 1) / 2;
net->ipv4.tcp_death_row.hashinfo = &tcp_hashinfo;
net->ipv4.sysctl_max_syn_backlog = max(128, cnt / 256);
return 0;
fail:
tcp_sk_exit(net);