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[TCP]: Add tcp_slow_start_after_idle sysctl.

Browse source 
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 <[email protected]>
This commit is contained in:
David S. Miller 2006-06-13 22:33:04 -07:00
commit 35089bb203
5 changed files with 22 additions and 1 deletions
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8
net/ipv4/sysctl_net_ipv4.c
View file

@ -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 }
};

6
net/ipv4/tcp_output.c
View file

@ -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;