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| author |   Eric Dumazet <edumazet@google.com> | 2015-03-19 19:04:21 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-03-20 12:40:25 -0400 |
| commit | becb74f0acca19b5abfcb24dc602530f3deea66a (patch) | |
| tree | 1c688749f3b5570f62245a7bb317c94f4af43a80 /include/net | |
| parent | inet: get rid of central tcp/dccp listener timer (diff) | |
| download | linux-dev-becb74f0acca19b5abfcb24dc602530f3deea66a.tar.xz linux-dev-becb74f0acca19b5abfcb24dc602530f3deea66a.zip | |
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>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/sock.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/net/sock.h b/include/net/sock.h index e0360f5a53e9..3f9b8ce56948 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -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; |