diff options
| author |   Dave Barach <dave@barachs.net> | 2019-11-08 08:22:28 -0500 |
|---|---|---|
| committer |   Andrew Yourtchenko <ayourtch@gmail.com> | 2019-11-18 13:37:23 +0000 |
| commit | 4fc160d7dd92acae430b15e0edabee6227d56e6e (patch) | |
| tree | 561b4743d1f03258e6e404695d239e6b622271ed | |
| parent | 636a8407586ed45a5b575ea58f4ad584e4a8a27c (diff) | |
vlib: fix handoff queue sequencing bug
Set vm->check_frame_queues after actually enqueuing a frame. Under
obscure circumstances, the code managed to set check_frame_queues so
far in advance that 100 dispatch cycles could elapse before the frame
enqueue succeeded. That resulted in permanent lack of queue service.
Type: fix
Ticket: VPP-1734
Fixes: 18191
Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: If2d398202b4ba2b96581d25e8142daef3f74c9e5
(cherry picked from commit 320998a8126766c0db92d9c7652f765f9565a7b5)
| -rw-r--r-- | src/vlib/buffer_node.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/vlib/buffer_node.h b/src/vlib/buffer_node.h index 5ded5066563..96b50ae3551 100644 --- a/src/vlib/buffer_node.h +++ b/src/vlib/buffer_node.h @@ -517,7 +517,6 @@ vlib_buffer_enqueue_to_thread (vlib_main_t * vm, u32 frame_queue_index, n_drop++; goto next; } - vlib_mains[next_thread_index]->check_frame_queues = 1; if (hf) hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_thread; @@ -539,6 +538,7 @@ vlib_buffer_enqueue_to_thread (vlib_main_t * vm, u32 frame_queue_index, { hf->n_vectors = VLIB_FRAME_SIZE; vlib_put_frame_queue_elt (hf); + vlib_mains[current_thread_index]->check_frame_queues = 1; current_thread_index = ~0; ptd->handoff_queue_elt_by_thread_index[next_thread_index] = 0; hf = 0; @@ -567,6 +567,7 @@ vlib_buffer_enqueue_to_thread (vlib_main_t * vm, u32 frame_queue_index, if (1 || hf->n_vectors == hf->last_n_vectors) { vlib_put_frame_queue_elt (hf); + vlib_mains[i]->check_frame_queues = 1; ptd->handoff_queue_elt_by_thread_index[i] = 0; } else |