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[TCP]: No need to re-count fackets_out/sacked_out at RTO 

Both sacked_out and fackets_out are directly known from how
parameter. Since fackets_out is accurate, there's no need for
recounting (sacked_out was previously unnecessarily counted
in the loop anyway).

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2007-10-11 17:34:57 -07:00 committed by David S. Miller
parent d193594299
commit 4cd829995b
1 changed files with 16 additions and 10 deletions
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26
net/ipv4/tcp_input.c
View File

@ -1711,18 +1711,23 @@ static void tcp_enter_frto_loss(struct sock *sk, int allowed_segments, int flag)
tcp_clear_retrans_hints_partial(tp); tcp_clear_retrans_hints_partial(tp);
} }
void tcp_clear_retrans(struct tcp_sock *tp) static void tcp_clear_retrans_partial(struct tcp_sock *tp)
{ {
tp->retrans_out = 0; tp->retrans_out = 0;
tp->fackets_out = 0;
tp->sacked_out = 0;
tp->lost_out = 0; tp->lost_out = 0;
tp->undo_marker = 0; tp->undo_marker = 0;
tp->undo_retrans = 0; tp->undo_retrans = 0;
} }
void tcp_clear_retrans(struct tcp_sock *tp)
{
tcp_clear_retrans_partial(tp);
tp->fackets_out = 0;
tp->sacked_out = 0;
}
/* Enter Loss state. If "how" is not zero, forget all SACK information /* Enter Loss state. If "how" is not zero, forget all SACK information
* and reset tags completely, otherwise preserve SACKs. If receiver * and reset tags completely, otherwise preserve SACKs. If receiver
* dropped its ofo queue, we will know this due to reneging detection. * dropped its ofo queue, we will know this due to reneging detection.
@ -1732,7 +1737,6 @@ void tcp_enter_loss(struct sock *sk, int how)
const struct inet_connection_sock *icsk = inet_csk(sk); const struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk); struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb; struct sk_buff *skb;
int cnt = 0;
/* Reduce ssthresh if it has not yet been made inside this window. */ /* Reduce ssthresh if it has not yet been made inside this window. */
if (icsk->icsk_ca_state <= TCP_CA_Disorder || tp->snd_una == tp->high_seq || if (icsk->icsk_ca_state <= TCP_CA_Disorder || tp->snd_una == tp->high_seq ||
@ -1746,7 +1750,10 @@ void tcp_enter_loss(struct sock *sk, int how)
tp->snd_cwnd_stamp = tcp_time_stamp; tp->snd_cwnd_stamp = tcp_time_stamp;
tp->bytes_acked = 0; tp->bytes_acked = 0;
tcp_clear_retrans(tp); tcp_clear_retrans_partial(tp);
if (tcp_is_reno(tp))
tcp_reset_reno_sack(tp);
if (!how) { if (!how) {
/* Push undo marker, if it was plain RTO and nothing /* Push undo marker, if it was plain RTO and nothing
@ -1754,13 +1761,15 @@ void tcp_enter_loss(struct sock *sk, int how)
tp->undo_marker = tp->snd_una; tp->undo_marker = tp->snd_una;
tcp_clear_retrans_hints_partial(tp); tcp_clear_retrans_hints_partial(tp);
} else { } else {
tp->sacked_out = 0;
tp->fackets_out = 0;
tcp_clear_all_retrans_hints(tp); tcp_clear_all_retrans_hints(tp);
} }
tcp_for_write_queue(skb, sk) { tcp_for_write_queue(skb, sk) {
if (skb == tcp_send_head(sk)) if (skb == tcp_send_head(sk))
break; break;
cnt += tcp_skb_pcount(skb);
if (TCP_SKB_CB(skb)->sacked&TCPCB_RETRANS) if (TCP_SKB_CB(skb)->sacked&TCPCB_RETRANS)
tp->undo_marker = 0; tp->undo_marker = 0;
TCP_SKB_CB(skb)->sacked &= (~TCPCB_TAGBITS)|TCPCB_SACKED_ACKED; TCP_SKB_CB(skb)->sacked &= (~TCPCB_TAGBITS)|TCPCB_SACKED_ACKED;
@ -1768,9 +1777,6 @@ void tcp_enter_loss(struct sock *sk, int how)
TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_ACKED; TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_ACKED;
TCP_SKB_CB(skb)->sacked |= TCPCB_LOST; TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
tp->lost_out += tcp_skb_pcount(skb); tp->lost_out += tcp_skb_pcount(skb);
} else {
tp->sacked_out += tcp_skb_pcount(skb);
tp->fackets_out = cnt;
} }
} }
tcp_verify_left_out(tp); tcp_verify_left_out(tp);