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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>
This commit is contained in:
Kenneth Klette Jonassen 2015-01-29 20:08:03 +01:00 committed by David S. Miller
parent a994a09097
commit 932eb7638a
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/tcp_input.c
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@ -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)) {