taglinefilesource code
when48include/linux/skbuff.hvolatile unsigned long  when;      /* used to compute rtt's      */
when623net/core/skbuff.cn->when=skb->when;
when339net/ipv4/ip_output.cskb->when = jiffies;
when686net/ipv4/ip_output.cskb->when=jiffies;
when845net/ipv4/ip_output.cskb->when = jiffies;
when651net/ipv4/tcp.cskb->when = jiffies;
when781net/ipv4/tcp.cstatic void reset_xmit_timer(struct sock *sk, int why, unsigned long when)
when785net/ipv4/tcp.cif((int)when < 0)
when787net/ipv4/tcp.cwhen=3;
when790net/ipv4/tcp.csk->retransmit_timer.expires=jiffies+when;
when992net/ipv4/tcp.cif (jiffies < skb->when + sk->rto) 
when994net/ipv4/tcp.creset_xmit_timer (sk, TIME_WRITE, skb->when + sk->rto - jiffies);
when3629net/ipv4/tcp.cm = jiffies - oskb->when;  /* RTT */
when3884net/ipv4/tcp.c(sk->send_head->when + sk->rto < jiffies))) 
when3886net/ipv4/tcp.cif(sk->send_head->when + sk->rto < jiffies)