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tcp: increase tcp_max_syn_backlog max value
tcp_max_syn_backlog default value depends on memory size and TCP ehash size. Before this patch, the max value was 2048 [1], which is considered too small nowadays. Increase it to 4096 to match the recent SOMAXCONN change. [1] This is with TCP ehash size being capped to 524288 buckets. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Willy Tarreau <w@1wt.eu> Cc: Yue Cao <ycao009@ucr.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -408,11 +408,14 @@ tcp_max_orphans - INTEGER
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up to ~64K of unswappable memory.
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tcp_max_syn_backlog - INTEGER
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Maximal number of remembered connection requests, which have not
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received an acknowledgment from connecting client.
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Maximal number of remembered connection requests (SYN_RECV),
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which have not received an acknowledgment from connecting client.
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This is a per-listener limit.
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The minimal value is 128 for low memory machines, and it will
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increase in proportion to the memory of machine.
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If server suffers from overload, try increasing this number.
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Remember to also check /proc/sys/net/core/somaxconn
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A SYN_RECV request socket consumes about 304 bytes of memory.
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tcp_max_tw_buckets - INTEGER
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Maximal number of timewait sockets held by system simultaneously.
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@ -2681,7 +2681,7 @@ static int __net_init tcp_sk_init(struct net *net)
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net->ipv4.tcp_death_row.sysctl_max_tw_buckets = cnt / 2;
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net->ipv4.tcp_death_row.hashinfo = &tcp_hashinfo;
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net->ipv4.sysctl_max_syn_backlog = max(128, cnt / 256);
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net->ipv4.sysctl_max_syn_backlog = max(128, cnt / 128);
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net->ipv4.sysctl_tcp_sack = 1;
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net->ipv4.sysctl_tcp_window_scaling = 1;
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net->ipv4.sysctl_tcp_timestamps = 1;
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