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authorFlorin Coras <fcoras@cisco.com>2019-10-06 14:06:14 -0700
committerFlorin Coras <florin.coras@gmail.com>2019-10-10 21:23:14 +0000
commitc31dc31f84961033ecb6354811e0c360b6cf5f79 (patch)
tree46224d5f2b9d126cb6bd5fa289a18186cb172aa5 /src/vnet/session
parent71a5da0c8dfa12ff012c8c101cf4d2b29fa0b6e3 (diff)
tcp: improve pacing after idle send periods
Rest pacer on ack reception if we haven't recently sent anything. Type: feature Change-Id: I820bacd81b65130052dfafbfcbe6ca4553069fbc Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/session')
-rw-r--r--src/vnet/session/session_node.c8
-rw-r--r--src/vnet/session/transport.c13
-rw-r--r--src/vnet/session/transport.h4
3 files changed, 19 insertions, 6 deletions
diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index 9e53718b8dd..f51b892736a 100644
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -845,6 +845,7 @@ session_tx_fifo_read_and_snd_i (session_worker_t * wrk,
{
if (ctx->transport_vft->flush_data)
ctx->transport_vft->flush_data (ctx->tc);
+ e->event_type = SESSION_IO_EVT_TX;
}
if (ctx->s->flags & SESSION_F_CUSTOM_TX)
@@ -883,7 +884,12 @@ session_tx_fifo_read_and_snd_i (session_worker_t * wrk,
session_tx_set_dequeue_params (vm, ctx, max_burst, peek_data);
if (PREDICT_FALSE (!ctx->max_len_to_snd))
- return SESSION_TX_NO_DATA;
+ {
+ transport_connection_tx_pacer_reset_bucket (ctx->tc,
+ vm->clib_time.
+ last_cpu_time);
+ return SESSION_TX_NO_DATA;
+ }
n_bufs_needed = ctx->n_segs_per_evt * ctx->n_bufs_per_seg;
vec_validate_aligned (wrk->tx_buffers, n_bufs_needed - 1,
diff --git a/src/vnet/session/transport.c b/src/vnet/session/transport.c
index 49a4af71111..8f7e30c8602 100644
--- a/src/vnet/session/transport.c
+++ b/src/vnet/session/transport.c
@@ -47,10 +47,6 @@ static clib_spinlock_t local_endpoints_lock;
*/
static double transport_pacer_period;
-#define TRANSPORT_PACER_MIN_MSS 1460
-#define TRANSPORT_PACER_MIN_BURST TRANSPORT_PACER_MIN_MSS
-#define TRANSPORT_PACER_MAX_BURST (43 * TRANSPORT_PACER_MIN_MSS)
-
u8 *
format_transport_proto (u8 * s, va_list * args)
{
@@ -583,6 +579,13 @@ spacer_max_burst (spacer_t * pacer, u64 norm_time_now)
u64 n_periods = norm_time_now - pacer->last_update;
u64 inc;
+ if (PREDICT_FALSE (n_periods > 5e5))
+ {
+ pacer->last_update = norm_time_now;
+ pacer->bucket = TRANSPORT_PACER_MIN_BURST;
+ return TRANSPORT_PACER_MIN_BURST;
+ }
+
if (n_periods > 0
&& (inc = (f32) n_periods * pacer->tokens_per_period) > 10)
{
@@ -674,7 +677,7 @@ transport_connection_snd_space (transport_connection_t * tc, u64 time_now,
u32 snd_space, max_paced_burst;
snd_space = tp_vfts[tc->proto].send_space (tc);
- if (transport_connection_is_tx_paced (tc))
+ if (snd_space && transport_connection_is_tx_paced (tc))
{
time_now >>= SPACER_CPU_TICKS_PER_PERIOD_SHIFT;
max_paced_burst = spacer_max_burst (&tc->pacer, time_now);
diff --git a/src/vnet/session/transport.h b/src/vnet/session/transport.h
index 5b45be0a0be..914991d5b31 100644
--- a/src/vnet/session/transport.h
+++ b/src/vnet/session/transport.h
@@ -19,6 +19,10 @@
#include <vnet/vnet.h>
#include <vnet/session/transport_types.h>
+#define TRANSPORT_PACER_MIN_MSS 1460
+#define TRANSPORT_PACER_MIN_BURST TRANSPORT_PACER_MIN_MSS
+#define TRANSPORT_PACER_MAX_BURST (43 * TRANSPORT_PACER_MIN_MSS)
+
typedef struct _transport_options_t
{
transport_tx_fn_type_t tx_type;