diff options
| author | Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> | 2007-11-15 19:35:11 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 14:54:02 -0800 |
| commit | f577111302677e6d1448475821cc19ba8835f60e (patch) | |
| tree | 4c5f5f0081bb0843a589fcae86ec6dc13dee3526 /net/ipv4 | |
| parent | b9d86585dc6c9265aa373c7036458fe8aa7627c6 (diff) | |
[TCP]: Extend reordering detection to cover CA_Loss partially
This implements more accurately what is stated in sacktag's
overall comment:
"Both of these heuristics are not used in Loss state, when
we cannot account for retransmits accurately."
When CA_Loss state is entered, the state changer ensures that
undo_marker is only set if no TCPCB_RETRANS skbs were found,
thus having non-zero undo_marker in CA_Loss basically tells
that the R-bits still accurately reflect the current state
of TCP.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp_input.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 901240f4068..26713e5d89d 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -1511,7 +1511,8 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_ tcp_verify_left_out(tp); - if ((reord < tp->fackets_out) && icsk->icsk_ca_state != TCP_CA_Loss && + if ((reord < tp->fackets_out) && + ((icsk->icsk_ca_state != TCP_CA_Loss) || tp->undo_marker) && (!tp->frto_highmark || after(tp->snd_una, tp->frto_highmark))) tcp_update_reordering(sk, tp->fackets_out - reord, 0); |