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authorFlorin Coras <fcoras@cisco.com>2018-10-31 23:09:22 -0700
committerDave Barach <openvpp@barachs.net>2018-11-01 20:43:29 +0000
commite55a6d7a97044c2f4fd0231242e062924d75c7b6 (patch)
treeae58b4562748db8397604029261008b94aaecd8c /src/vnet/tcp/tcp_output.c
parentf6c68d74eca9038516986254846de60a4f7c02ae (diff)
tcp: fast retransmit pacing
Force pacing for fast retransmit to avoid bursts of retransmitted packets. Change-Id: I2ff42c328899b36322c4de557b1f7d853dba8fe2 Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/tcp/tcp_output.c')
-rw-r--r--src/vnet/tcp/tcp_output.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index f14a61263d4..81579ef96a2 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -1452,10 +1452,10 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
}
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
-
if (tc->state >= TCP_STATE_ESTABLISHED)
{
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
+
/* Lost FIN, retransmit and return */
if (tcp_is_lost_fin (tc))
{
@@ -1536,6 +1536,8 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
return;
}
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
+
/* Try without increasing RTO a number of times. If this fails,
* start growing RTO exponentially */
tc->rto_boff += 1;
@@ -1562,6 +1564,8 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
/* Retransmit SYN-ACK */
else if (tc->state == TCP_STATE_SYN_RCVD)
{
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
+
tc->rto_boff += 1;
if (tc->rto_boff > TCP_RTO_SYN_RETRIES)
tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);
@@ -1693,7 +1697,7 @@ tcp_retransmit_first_unacked (tcp_connection_t * tc)
old_snd_nxt = tc->snd_nxt;
tc->snd_nxt = tc->snd_una;
- TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2);
+ TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1);
n_bytes = tcp_prepare_retransmit_segment (tc, 0, tc->snd_mss, &b);
if (!n_bytes)