1 files changed, 7 insertions, 0 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2e878f392..c934446f3 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3098,6 +3098,13 @@ static bool tcp_ack_update_rtt(struct sock *sk, const int flag,
 
         /* RFC6298: only reset backoff on valid RTT measurement. */
         inet_csk(sk)->icsk_backoff = 0;
+    //打印RTT
+        struct inet_sock *inet2;
+        inet2 = inet_sk(sk);
+        if(ntohs(inet2->inet_dport) == 5201 || ntohs(inet2->inet_sport) == 5201){
+                printk(KERN_DEBUG "in tcp_ack_update_rtt now RTT is %ld\n",rs->rtt_us);
+                // printk(KERN_DEBUG "in tcp_ack_update_rtt cwnd is %u\n", tp->snd_cwnd);
+        }
         return true;
 }