18,356
社区成员
发帖
与我相关
我的任务
分享
static void tcp_event_new_data_sent(struct sock *sk, struct sk_buff *skb)
{
struct tcp_sock *tp = tcp_sk(sk);
unsigned int prior_packets = tp->packets_out;
tcp_advance_send_head(sk, skb);
tp->snd_nxt = TCP_SKB_CB(skb)->end_seq;
/* Don't override Nagle indefinately with F-RTO */
if (tp->frto_counter == 2)
tp->frto_counter = 3;
//关键在这里tp->packets_out += tcp_skb_pcount(skb);
if (!prior_packets)
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
inet_csk(sk)->icsk_rto, TCP_RTO_MAX);
}
可以看到只有当prior_packets为0时才会重启定时器,而prior_packets则是发送未确认的段的个数,也就是说如果