diff options
| author | Kenneth Klette Jonassen <kennetkl@ifi.uio.no> | 2015-01-29 20:08:03 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-01-31 17:25:37 -0800 |
| commit | 932eb7638ad7d9145620178992044b5e87356969 (patch) | |
| tree | 21193b909507445dc8e994ecf65b9efb5230d42c /net/ipv4/tcp_input.c | |
| parent | a994a09097660d7ae6cdf868720f7a991b19b987 (diff) | |
tcp: use SACK RTTs for CC
Current behavior only passes RTTs from sequentially acked data to CC.
If sender gets a combined ACK for segment 1 and SACK for segment 3, then the
computed RTT for CC is the time between sending segment 1 and receiving SACK
for segment 3.
Pass the minimum computed RTT from any acked data to CC, i.e. time between
sending segment 3 and receiving SACK for segment 3.
Signed-off-by: Kenneth Klette Jonassen <kennetkl@ifi.uio.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
| -rw-r--r-- | net/ipv4/tcp_input.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 71fb37c70581..ed11931f340f 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -3183,8 +3183,10 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets, tp->fackets_out -= min(pkts_acked, tp->fackets_out); - if (ca_ops->pkts_acked) - ca_ops->pkts_acked(sk, pkts_acked, ca_seq_rtt_us); + if (ca_ops->pkts_acked) { + long rtt_us = min_t(ulong, ca_seq_rtt_us, sack_rtt_us); + ca_ops->pkts_acked(sk, pkts_acked, rtt_us); + } } else if (skb && rtt_update && sack_rtt_us >= 0 && sack_rtt_us > skb_mstamp_us_delta(&now, &skb->skb_mstamp)) { |