session: alloc one frame per output node dispatch
Change-Id: I1f7877af61f3726cfb7b93ce7893f6df23e866a6
Signed-off-by: Florin Coras <fcoras@cisco.com>
diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index 269e2fb..07cca6d 100644
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -159,23 +159,14 @@
session_manager_main_t * smm,
u32 thread_index, u16 * n_bufs, u32 wanted)
{
- u32 bufs_alloc = 0, bufs_now;
- vec_validate_aligned (smm->tx_buffers[thread_index], *n_bufs + wanted - 1,
+ u32 n_alloc;
+ vec_validate_aligned (smm->tx_buffers[thread_index], wanted - 1,
CLIB_CACHE_LINE_BYTES);
- do
- {
- bufs_now =
- vlib_buffer_alloc (vm,
- &smm->tx_buffers[thread_index][*n_bufs +
- bufs_alloc],
- wanted - bufs_alloc);
- bufs_alloc += bufs_now;
- }
- while (bufs_now > 0 && ((bufs_alloc + *n_bufs < wanted)));
-
- *n_bufs += bufs_alloc;
+ n_alloc = vlib_buffer_alloc (vm, &smm->tx_buffers[thread_index][*n_bufs],
+ wanted - *n_bufs);
+ *n_bufs += n_alloc;
_vec_len (smm->tx_buffers[thread_index]) = *n_bufs;
- return bufs_alloc;
+ return n_alloc;
}
always_inline void
@@ -295,7 +286,7 @@
always_inline void
session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
- u8 peek_data)
+ u32 max_segs, u8 peek_data)
{
u32 n_bytes_per_buf, n_bytes_per_seg;
ctx->max_dequeue = svm_fifo_max_dequeue (ctx->s->server_tx_fifo);
@@ -342,11 +333,19 @@
ctx->max_len_to_snd = ctx->snd_space;
}
+ /* Check if we're tx constrained by the node */
+ ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->snd_mss);
+ if (ctx->n_segs_per_evt > max_segs)
+ {
+ ctx->n_segs_per_evt = max_segs;
+ ctx->max_len_to_snd = max_segs * ctx->snd_mss;
+ }
+
n_bytes_per_buf = vlib_buffer_free_list_buffer_size (vm,
VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
ASSERT (n_bytes_per_buf > MAX_HDRS_LEN);
n_bytes_per_seg = MAX_HDRS_LEN + ctx->snd_mss;
- ctx->n_bufs_per_seg = ceil ((double) n_bytes_per_seg / n_bytes_per_buf);
+ ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf);
ctx->deq_per_buf = clib_min (ctx->snd_mss, n_bytes_per_buf);
ctx->deq_per_first_buf = clib_min (ctx->snd_mss,
n_bytes_per_buf - MAX_HDRS_LEN);
@@ -359,8 +358,8 @@
u8 peek_data)
{
u32 next_index, next0, next1, next2, next3, *to_next, n_left_to_next;
- u32 n_trace = vlib_get_trace_count (vm, node), n_packets = 0, pbi;
- u32 n_bufs_per_frame, thread_index = s->thread_index;
+ u32 n_trace = vlib_get_trace_count (vm, node), n_bufs_needed = 0;
+ u32 thread_index = s->thread_index, n_left, pbi;
session_manager_main_t *smm = &session_manager_main;
session_tx_context_t *ctx = &smm->ctx[thread_index];
transport_proto_t tp;
@@ -392,22 +391,23 @@
svm_fifo_unset_event (s->server_tx_fifo);
/* Check how much we can pull. */
- session_tx_set_dequeue_params (vm, ctx, peek_data);
+ session_tx_set_dequeue_params (vm, ctx, VLIB_FRAME_SIZE - *n_tx_packets,
+ peek_data);
+
if (PREDICT_FALSE (!ctx->max_len_to_snd))
return 0;
n_bufs = vec_len (smm->tx_buffers[thread_index]);
- ctx->left_to_snd = ctx->max_len_to_snd;
+ n_bufs_needed = ctx->n_segs_per_evt * ctx->n_bufs_per_seg;
/*
* Make sure we have at least one full frame of buffers ready
*/
- n_bufs_per_frame = ctx->n_bufs_per_seg * VLIB_FRAME_SIZE;
- if (n_bufs < n_bufs_per_frame)
+ if (n_bufs < n_bufs_needed)
{
session_output_try_get_buffers (vm, smm, thread_index, &n_bufs,
- n_bufs_per_frame);
- if (PREDICT_FALSE (n_bufs < n_bufs_per_frame))
+ ctx->n_bufs_per_seg * VLIB_FRAME_SIZE);
+ if (PREDICT_FALSE (n_bufs < n_bufs_needed))
{
vec_add1 (smm->pending_event_vector[thread_index], *e);
return -1;
@@ -418,9 +418,16 @@
* Write until we fill up a frame
*/
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
- while (ctx->left_to_snd && n_left_to_next)
+ if (PREDICT_FALSE (ctx->n_segs_per_evt > n_left_to_next))
{
- while (ctx->left_to_snd > 3 * ctx->snd_mss && n_left_to_next >= 4)
+ ctx->n_segs_per_evt = n_left_to_next;
+ ctx->max_len_to_snd = ctx->snd_mss * n_left_to_next;
+ }
+ ctx->left_to_snd = ctx->max_len_to_snd;
+ n_left = ctx->n_segs_per_evt;
+ while (n_left)
+ {
+ while (n_left >= 4)
{
vlib_buffer_t *b0, *b1;
u32 bi0, bi1;
@@ -446,7 +453,7 @@
to_next += 2;
n_left_to_next -= 2;
- n_packets += 2;
+ n_left -= 2;
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
@@ -463,7 +470,7 @@
n_left_to_next, bi0, bi1,
next0, next1);
}
- while (ctx->left_to_snd && n_left_to_next)
+ while (n_left)
{
vlib_buffer_t *b0;
u32 bi0;
@@ -479,7 +486,7 @@
to_next += 1;
n_left_to_next -= 1;
- n_packets += 1;
+ n_left -= 1;
VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
if (PREDICT_FALSE (n_trace > 0))
@@ -490,10 +497,11 @@
}
}
_vec_len (smm->tx_buffers[thread_index]) = n_bufs;
- *n_tx_packets += n_packets;
+ *n_tx_packets += ctx->n_segs_per_evt;
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
/* If we couldn't dequeue all bytes mark as partially read */
+ ASSERT (ctx->left_to_snd == 0);
if (ctx->max_len_to_snd < ctx->max_dequeue)
if (svm_fifo_set_event (s->server_tx_fifo))
vec_add1 (smm->pending_event_vector[thread_index], *e);
@@ -687,31 +695,31 @@
svm_queue_t *q;
application_t *app;
int n_tx_packets = 0;
- u32 my_thread_index = vm->thread_index;
+ u32 thread_index = vm->thread_index;
int i, rv;
f64 now = vlib_time_now (vm);
void (*fp) (void *);
- SESSION_EVT_DBG (SESSION_EVT_POLL_GAP_TRACK, smm, my_thread_index);
+ SESSION_EVT_DBG (SESSION_EVT_POLL_GAP_TRACK, smm, thread_index);
/*
* Update transport time
*/
- transport_update_time (now, my_thread_index);
+ transport_update_time (now, thread_index);
/*
* Get vpp queue events
*/
- q = smm->vpp_event_queues[my_thread_index];
+ q = smm->vpp_event_queues[thread_index];
if (PREDICT_FALSE (q == 0))
return 0;
- my_fifo_events = smm->free_event_vector[my_thread_index];
+ my_fifo_events = smm->free_event_vector[thread_index];
/* min number of events we can dequeue without blocking */
n_to_dequeue = q->cursize;
- my_pending_event_vector = smm->pending_event_vector[my_thread_index];
- pending_disconnects = smm->pending_disconnects[my_thread_index];
+ my_pending_event_vector = smm->pending_event_vector[thread_index];
+ pending_disconnects = smm->pending_disconnects[thread_index];
if (!n_to_dequeue && !vec_len (my_pending_event_vector)
&& !vec_len (pending_disconnects))
@@ -746,11 +754,11 @@
pthread_mutex_unlock (&q->mutex);
vec_append (my_fifo_events, my_pending_event_vector);
- vec_append (my_fifo_events, smm->pending_disconnects[my_thread_index]);
+ vec_append (my_fifo_events, smm->pending_disconnects[thread_index]);
_vec_len (my_pending_event_vector) = 0;
- smm->pending_event_vector[my_thread_index] = my_pending_event_vector;
- _vec_len (smm->pending_disconnects[my_thread_index]) = 0;
+ smm->pending_event_vector[thread_index] = my_pending_event_vector;
+ _vec_len (smm->pending_disconnects[thread_index]) = 0;
skip_dequeue:
n_events = vec_len (my_fifo_events);
@@ -760,17 +768,22 @@
session_fifo_event_t *e0;
e0 = &my_fifo_events[i];
-
switch (e0->event_type)
{
case FIFO_EVENT_APP_TX:
- s0 = session_event_get_session (e0, my_thread_index);
+ if (n_tx_packets == VLIB_FRAME_SIZE)
+ {
+ vec_add1 (smm->pending_event_vector[thread_index], *e0);
+ break;
+ }
+ s0 = session_event_get_session (e0, thread_index);
if (PREDICT_FALSE (!s0))
{
clib_warning ("It's dead, Jim!");
continue;
}
+
/* Spray packets in per session type frames, since they go to
* different nodes */
rv = (smm->session_tx_fns[s0->session_type]) (vm, node, e0, s0,
@@ -784,18 +797,19 @@
}
break;
case FIFO_EVENT_DISCONNECT:
- /* Make sure disconnects run after the pending list is drained */
+ /* Make sure stream disconnects run after the pending list is drained */
s0 = session_get_from_handle (e0->session_handle);
if (!e0->postponed || svm_fifo_max_dequeue (s0->server_tx_fifo))
{
e0->postponed = 1;
- vec_add1 (smm->pending_disconnects[my_thread_index], *e0);
+ vec_add1 (smm->pending_disconnects[thread_index], *e0);
continue;
}
+
stream_session_disconnect_transport (s0);
break;
case FIFO_EVENT_BUILTIN_RX:
- s0 = session_event_get_session (e0, my_thread_index);
+ s0 = session_event_get_session (e0, thread_index);
if (PREDICT_FALSE (!s0))
continue;
svm_fifo_unset_event (s0->server_rx_fifo);
@@ -813,7 +827,7 @@
}
_vec_len (my_fifo_events) = 0;
- smm->free_event_vector[my_thread_index] = my_fifo_events;
+ smm->free_event_vector[thread_index] = my_fifo_events;
vlib_node_increment_counter (vm, session_queue_node.index,
SESSION_QUEUE_ERROR_TX, n_tx_packets);