From: Eric Dumazet Date: Wed, 30 Oct 2019 17:05:46 +0000 (-0700) Subject: tcp: increase tcp_max_syn_backlog max value X-Git-Tag: v5.4-rc6~8^2~10 X-Git-Url: https://git.kernel.dk/?p=linux-2.6-block.git;a=commitdiff_plain;h=623d0c2db02043e43b698fdd8de1bd398b8e7b37 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 Cc: Willy Tarreau Cc: Yue Cao Signed-off-by: David S. Miller --- diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index 0e6653471c0e..8d4ad1d1ae26 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -408,11 +408,14 @@ tcp_max_orphans - INTEGER up to ~64K of unswappable memory. tcp_max_syn_backlog - INTEGER - Maximal number of remembered connection requests, which have not - received an acknowledgment from connecting client. + Maximal number of remembered connection requests (SYN_RECV), + which have not received an acknowledgment from connecting client. + This is a per-listener limit. The minimal value is 128 for low memory machines, and it will increase in proportion to the memory of machine. If server suffers from overload, try increasing this number. + Remember to also check /proc/sys/net/core/somaxconn + A SYN_RECV request socket consumes about 304 bytes of memory. tcp_max_tw_buckets - INTEGER Maximal number of timewait sockets held by system simultaneously. diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 6be568334848..b74192695955 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2681,7 +2681,7 @@ static int __net_init tcp_sk_init(struct net *net) net->ipv4.tcp_death_row.sysctl_max_tw_buckets = cnt / 2; net->ipv4.tcp_death_row.hashinfo = &tcp_hashinfo; - net->ipv4.sysctl_max_syn_backlog = max(128, cnt / 256); + net->ipv4.sysctl_max_syn_backlog = max(128, cnt / 128); net->ipv4.sysctl_tcp_sack = 1; net->ipv4.sysctl_tcp_window_scaling = 1; net->ipv4.sysctl_tcp_timestamps = 1;