If in recovery and rate samples are taken for burts that have not been
retransmitted, use the rtt estimate.
Type: feature
Change-Id: I95028f492008457c959157aa4ee4c3435fa9c3f0
Signed-off-by: Florin Coras <fcoras@cisco.com>
* return 1 if valid rtt 0 otherwise
*/
static int
* return 1 if valid rtt 0 otherwise
*/
static int
-tcp_update_rtt (tcp_connection_t * tc, u32 ack)
+tcp_update_rtt (tcp_connection_t * tc, tcp_rate_sample_t * rs, u32 ack)
{
u32 mrtt = 0;
/* Karn's rule, part 1. Don't use retransmitted segments to estimate
* RTT because they're ambiguous. */
{
u32 mrtt = 0;
/* Karn's rule, part 1. Don't use retransmitted segments to estimate
* RTT because they're ambiguous. */
- if (tcp_in_cong_recovery (tc) || tc->sack_sb.sacked_bytes)
+ if (tcp_in_cong_recovery (tc))
+ /* Accept rtt estimates for samples that have not been retransmitted */
+ if ((tc->flags & TCP_CONN_RATE_SAMPLE) && !(rs->flags & TCP_BTS_IS_RXT))
+ {
+ mrtt = rs->rtt_time * THZ;
+ goto estimate_rtt;
+ }
if (tcp_in_recovery (tc))
return 0;
goto done;
if (tcp_in_recovery (tc))
return 0;
goto done;
mrtt = clib_max (now - tc->rcv_opts.tsecr, 1);
}
mrtt = clib_max (now - tc->rcv_opts.tsecr, 1);
}
/* Ignore dubious measurements */
if (mrtt == 0 || mrtt > TCP_RTT_MAX)
goto done;
/* Ignore dubious measurements */
if (mrtt == 0 || mrtt > TCP_RTT_MAX)
goto done;
tc->snd_una = vnet_buffer (b)->tcp.ack_number;
tcp_validate_txf_size (tc, tc->bytes_acked);
tc->snd_una = vnet_buffer (b)->tcp.ack_number;
tcp_validate_txf_size (tc, tc->bytes_acked);
+ if (tc->flags & TCP_CONN_RATE_SAMPLE)
+ tcp_bt_sample_delivery_rate (tc, &rs);
+
if (tc->bytes_acked)
{
tcp_program_dequeue (wrk, tc);
if (tc->bytes_acked)
{
tcp_program_dequeue (wrk, tc);
- tcp_update_rtt (tc, vnet_buffer (b)->tcp.ack_number);
+ tcp_update_rtt (tc, &rs, vnet_buffer (b)->tcp.ack_number);
- if (tc->flags & TCP_CONN_RATE_SAMPLE)
- tcp_bt_sample_delivery_rate (tc, &rs);
-
TCP_EVT (TCP_EVT_ACK_RCVD, tc);
/*
TCP_EVT (TCP_EVT_ACK_RCVD, tc);
/*