commit e55a6d7a97044c2f4fd0231242e062924d75c7b6
author Florin Coras <fcoras@cisco.com> Wed Oct 31 23:09:22 2018 -0700
committer Dave Barach <openvpp@barachs.net> Thu Nov 01 20:43:29 2018 +0000
tree ae58b4562748db8397604029261008b94aaecd8c
parent f6c68d74eca9038516986254846de60a4f7c02ae

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>

src/vnet/tcp/tcp.h

diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index 4ba3d5e..f7424c3 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -160,7 +160,7 @@
 };
 
 #define TCP_SCOREBOARD_TRACE (0)
-#define TCP_MAX_SACK_BLOCKS 32	/**< Max number of SACK blocks stored */
+#define TCP_MAX_SACK_BLOCKS 256	/**< Max number of SACK blocks stored */
 #define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0)
 
 typedef struct _scoreboard_trace_elt
@@ -390,6 +390,9 @@
 						     needing fast rxt */
   u32 *ongoing_fast_rxt;			/**< vector of connections
 						     now doing fast rxt */
+  u32 *postponed_fast_rxt;			/**< vector of connections
+						     that will do fast rxt */
+  vlib_main_t *vm;				/**< pointer to vm */
 
     CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
   u8 cached_opts[40];				/**< cached 'on the wire'
@@ -722,8 +725,8 @@
 tcp_cc_rcv_ack (tcp_connection_t * tc)
 {
   tc->cc_algo->rcv_ack (tc);
-  tcp_update_pacer (tc);
   tc->tsecr_last_ack = tc->rcv_opts.tsecr;
+  tcp_update_pacer (tc);
 }
 
 always_inline void