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authorDavid S. Miller <davem@sunset.davemloft.net>2006-06-13 22:33:04 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-06-17 21:30:53 -0700
commit35089bb203f44e33b6bbb6c4de0b0708f9a48921 (patch)
tree3e9ca3dbc12a063121c3ecba2558400307d4acd5 /net/ipv4/tcp_output.c
parent9e1881dec9e3e8f8408551cddfda489857a7ec99 (diff)
[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/ipv4/tcp_output.c')
-rw-r--r--net/ipv4/tcp_output.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index f33c9dddaa1..07bb5a2b375 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;