In current RFC3465 Appropriate Byte Count implementation,
slow start after retransmit timeout does not work.
I fixed it.
--
Daikichi Osuga
*** linux-2.6.15.i686.org/net/ipv4/tcp_input.c 2006-07-25 15:44:35.000000000
+0900
--- linux-2.6.15.i686/net/ipv4/tcp_input.c 2006-08-08 14:38:24.000000000 +0900
***************
*** 2450,2456 ****
if (before(ack, prior_snd_una))
goto old_ack;
! if (sysctl_tcp_abc && icsk->icsk_ca_state < TCP_CA_CWR)
tp->bytes_acked += ack - prior_snd_una;
if (!(flag&FLAG_SLOWPATH) && after(ack, prior_snd_una)) {
--- 2551,2557 ----
if (before(ack, prior_snd_una))
goto old_ack;
! if (sysctl_tcp_abc && (icsk->icsk_ca_state < TCP_CA_CWR || icsk->icsk_ca_state == TCP_CA_Loss))
tp->bytes_acked += ack - prior_snd_una;
if (!(flag&FLAG_SLOWPATH) && after(ack, prior_snd_una)) {
*** linux-2.6.15.i686.org/net/ipv4/tcp_cong.c 2006-07-25 15:44:35.000000000
+0900
--- linux-2.6.15.i686/net/ipv4/tcp_cong.c 2006-08-08 15:47:45.000000000 +0900
***************
*** 180,185 ****
--- 180,186 ----
*/
void tcp_slow_start(struct tcp_sock *tp)
{
+ struct inet_connection_sock *icsk = (struct inet_connection_sock *)tp;
if (sysctl_tcp_abc) {
/* RFC3465: Slow Start
* TCP sender SHOULD increase cwnd by the number of
***************
*** 190,196 ****
return;
/* We MAY increase by 2 if discovered delayed ack */
! if (sysctl_tcp_abc > 1 && tp->bytes_acked > 2*tp->mss_cache) {
if (tp->snd_cwnd < tp->snd_cwnd_clamp)
tp->snd_cwnd++;
}
--- 191,197 ----
return;
/* We MAY increase by 2 if discovered delayed ack */
! if (sysctl_tcp_abc > 1 && tp->bytes_acked >= 2*tp->mss_cache &&
icsk->icsk_ca_state != TCP_CA_Loss) {
if (tp->snd_cwnd < tp->snd_cwnd_clamp)
tp->snd_cwnd++;
}
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