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authorFlorin Coras <fcoras@cisco.com>2018-10-30 10:21:59 -0700
committerMarco Varlese <marco.varlese@suse.de>2018-10-31 08:17:33 +0000
commit5f56d736cbd752216357357b8de6a120a41c08eb (patch)
tree783abee8a2c3e77513940734716775a88ac6bdeb /src/vnet/session/session_node.c
parent5a7ca7bde104b12f8dc4a751fd911819d4bd6c8e (diff)
session: prioritize postponed sessions
If sessions cannot be handled during the current dispatch loop iteration, ensure that they are first to be handled in the next. Change-Id: Ifc6215900f8cfd530d4886b58641189f0ccf9bb7 Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/session/session_node.c')
-rw-r--r--src/vnet/session/session_node.c65
1 files changed, 24 insertions, 41 deletions
diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index 04a5622c835..6ef461a5f34 100644
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -764,8 +764,7 @@ session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
session_manager_main_t *smm = vnet_get_session_manager_main ();
u32 thread_index = vm->thread_index, n_to_dequeue, n_events;
session_manager_worker_t *wrk = &smm->wrk[thread_index];
- session_event_t *pending_events, *e;
- session_event_t *fifo_events;
+ session_event_t *e, *fifo_events;
svm_msg_q_msg_t _msg, *msg = &_msg;
f64 now = vlib_time_now (vm);
int n_tx_packets = 0, i, rv;
@@ -782,55 +781,39 @@ session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
session_update_dispatch_period (wrk, now, thread_index);
transport_update_time (now, thread_index);
- /*
- * Get vpp queue events that we can dequeue without blocking
- */
- mq = wrk->vpp_event_queue;
- fifo_events = wrk->free_event_vector;
- n_to_dequeue = svm_msg_q_size (mq);
- pending_events = wrk->pending_event_vector;
-
- if (!n_to_dequeue && !vec_len (pending_events)
- && !vec_len (wrk->pending_disconnects))
- return 0;
-
SESSION_EVT_DBG (SESSION_EVT_DEQ_NODE, 0);
- /*
- * If we didn't manage to process previous events try going
- * over them again without dequeuing new ones.
- * XXX: Handle senders to sessions that can't keep up
- */
- if (0 && vec_len (pending_events) >= 100)
- {
- clib_warning ("too many fifo events unsolved");
- goto skip_dequeue;
- }
+ /* Make sure postponed events are handled first */
+ fifo_events = wrk->free_event_vector;
+ vec_append (fifo_events, wrk->postponed_event_vector);
+ _vec_len (wrk->pending_disconnects) = 0;
- /* See you in the next life, don't be late
+ /* Try to dequeue what is available. Don't wait for lock.
* XXX: we may need priorities here */
- if (svm_msg_q_try_lock (mq))
- return 0;
-
- for (i = 0; i < n_to_dequeue; i++)
+ mq = wrk->vpp_event_queue;
+ n_to_dequeue = svm_msg_q_size (mq);
+ if (n_to_dequeue && svm_msg_q_try_lock (mq) == 0)
{
- vec_add2 (fifo_events, e, 1);
- svm_msg_q_sub_w_lock (mq, msg);
- clib_memcpy (e, svm_msg_q_msg_data (mq, msg), sizeof (*e));
- svm_msg_q_free_msg (mq, msg);
+ for (i = 0; i < n_to_dequeue; i++)
+ {
+ vec_add2 (fifo_events, e, 1);
+ svm_msg_q_sub_w_lock (mq, msg);
+ clib_memcpy (e, svm_msg_q_msg_data (mq, msg), sizeof (*e));
+ svm_msg_q_free_msg (mq, msg);
+ }
+ svm_msg_q_unlock (mq);
}
- svm_msg_q_unlock (mq);
-
- vec_append (fifo_events, pending_events);
+ vec_append (fifo_events, wrk->pending_event_vector);
vec_append (fifo_events, wrk->pending_disconnects);
- _vec_len (pending_events) = 0;
- wrk->pending_event_vector = pending_events;
- _vec_len (wrk->pending_disconnects) = 0;
+ _vec_len (wrk->postponed_event_vector) = 0;
+ _vec_len (wrk->pending_event_vector) = 0;
-skip_dequeue:
n_events = vec_len (fifo_events);
+ if (PREDICT_FALSE (!n_events))
+ return 0;
+
for (i = 0; i < n_events; i++)
{
stream_session_t *s; /* $$$ prefetch 1 ahead maybe */
@@ -844,7 +827,7 @@ skip_dequeue:
/* Don't try to send more that one frame per dispatch cycle */
if (n_tx_packets == VLIB_FRAME_SIZE)
{
- vec_add1 (wrk->pending_event_vector, *e);
+ vec_add1 (wrk->postponed_event_vector, *e);
break;
}