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-rw-r--r--src/vnet/tcp/tcp.c4
-rw-r--r--src/vnet/tcp/tcp.h7
2 files changed, 11 insertions, 0 deletions
diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index 7b5b5537613..57e62f8eade 100644
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -1575,6 +1575,7 @@ tcp_init (vlib_main_t * vm)
tm->tx_pacing = 1;
tm->cc_algo = TCP_CC_NEWRENO;
tm->default_mtu = 1460;
+ tm->initial_cwnd_multiplier = 0;
return 0;
}
@@ -1644,6 +1645,9 @@ tcp_config_fn (vlib_main_t * vm, unformat_input_t * input)
;
else if (unformat (input, "mtu %d", &tm->default_mtu))
;
+ else if (unformat (input, "initial-cwnd-multiplier %d",
+ &tm->initial_cwnd_multiplier))
+ ;
else if (unformat (input, "no-tx-pacing"))
tm->tx_pacing = 0;
else if (unformat (input, "cc-algo %U", unformat_tcp_cc_algo,
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index e4980dd64eb..8b943cdd5b5 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -532,6 +532,10 @@ typedef struct _tcp_main
/** Default MTU to be used when establishing connections */
u16 default_mtu;
+ /** Initial CWND multiplier, which multiplies MSS to determine initial CWND.
+ * Set 0 to determine the initial CWND by another way */
+ u16 initial_cwnd_multiplier;
+
/** Number of preallocated connections */
u32 preallocated_connections;
u32 preallocated_half_open_connections;
@@ -809,6 +813,9 @@ tcp_flight_size (const tcp_connection_t * tc)
always_inline u32
tcp_initial_cwnd (const tcp_connection_t * tc)
{
+ if (tcp_main.initial_cwnd_multiplier > 0)
+ return tcp_main.initial_cwnd_multiplier * tc->snd_mss;
+
if (tc->snd_mss > 2190)
return 2 * tc->snd_mss;
else if (tc->snd_mss > 1095)