diff options
| author | David S. Miller <davem@sunset.davemloft.net> | 2006-06-13 22:33:04 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-06-17 21:30:53 -0700 |
| commit | 35089bb203f44e33b6bbb6c4de0b0708f9a48921 (patch) | |
| tree | 3e9ca3dbc12a063121c3ecba2558400307d4acd5 /net | |
| parent | 9e1881dec9e3e8f8408551cddfda489857a7ec99 (diff) | |
| download | lwn-35089bb203f44e33b6bbb6c4de0b0708f9a48921.tar.gz lwn-35089bb203f44e33b6bbb6c4de0b0708f9a48921.zip | |
[TCP]: Add tcp_slow_start_after_idle sysctl.
A lot of people have asked for a way to disable tcp_cwnd_restart(),
and it seems reasonable to add a sysctl to do that.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/sysctl_net_ipv4.c | 8 | ||||
| -rw-r--r-- | net/ipv4/tcp_output.c | 6 |
2 files changed, 13 insertions, 1 deletions
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index e7fb665873c6..ce4cd5f35511 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -690,6 +690,14 @@ ctl_table ipv4_table[] = { .proc_handler = &proc_dointvec }, #endif + { + .ctl_name = NET_TCP_SLOW_START_AFTER_IDLE, + .procname = "tcp_slow_start_after_idle", + .data = &sysctl_tcp_slow_start_after_idle, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec + }, { .ctl_name = 0 } }; diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index f33c9dddaa12..07bb5a2b375e 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -59,6 +59,9 @@ int sysctl_tcp_tso_win_divisor = 3; int sysctl_tcp_mtu_probing = 0; int sysctl_tcp_base_mss = 512; +/* By default, RFC2861 behavior. */ +int sysctl_tcp_slow_start_after_idle = 1; + static void update_send_head(struct sock *sk, struct tcp_sock *tp, struct sk_buff *skb) { @@ -138,7 +141,8 @@ static void tcp_event_data_sent(struct tcp_sock *tp, struct inet_connection_sock *icsk = inet_csk(sk); const u32 now = tcp_time_stamp; - if (!tp->packets_out && (s32)(now - tp->lsndtime) > icsk->icsk_rto) + if (sysctl_tcp_slow_start_after_idle && + (!tp->packets_out && (s32)(now - tp->lsndtime) > icsk->icsk_rto)) tcp_cwnd_restart(sk, __sk_dst_get(sk)); tp->lsndtime = now; |