diff options
| author | Lars Ellenberg <lars@linbit.com> | 2014-09-11 14:29:11 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-09-11 08:41:29 -0600 |
| commit | abde9cc6a59cb7f07fda4c77fee2150314e423fa (patch) | |
| tree | 305a69aa4ced1af877bb2a3413dc2adf6a72f6b7 | |
| parent | b47a06d10561bfe7317b1355b4b8e4168fc6b4b7 (diff) | |
drbd: Improve asender performance
Shorten receive path in the asender thread. Reduces CPU utilisation
of asender when receiving packets, and with that increases IOPs.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | drivers/block/drbd/drbd_receiver.c | 6 | ||||
| -rw-r--r-- | drivers/block/drbd/drbd_worker.c | 11 |
2 files changed, 7 insertions, 10 deletions
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 3ae769e671e8..6960fb064731 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -5561,6 +5561,7 @@ int drbd_asender(struct drbd_thread *thi) * rv < expected: "woken" by signal during receive * rv == 0 : "connection shut down by peer" */ +received_more: if (likely(rv > 0)) { received += rv; buf += rv; @@ -5636,6 +5637,11 @@ int drbd_asender(struct drbd_thread *thi) expect = header_size; cmd = NULL; } + if (test_bit(SEND_PING, &connection->flags)) + continue; + rv = drbd_recv_short(connection->meta.socket, buf, expect-received, MSG_DONTWAIT); + if (rv > 0) + goto received_more; } if (0) { diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c index 3b74f08c8b83..3ed2d871272e 100644 --- a/drivers/block/drbd/drbd_worker.c +++ b/drivers/block/drbd/drbd_worker.c @@ -1994,22 +1994,13 @@ static bool dequeue_work_batch(struct drbd_work_queue *queue, struct list_head * return !list_empty(work_list); } -static bool dequeue_work_item(struct drbd_work_queue *queue, struct list_head *work_list) -{ - spin_lock_irq(&queue->q_lock); - if (!list_empty(&queue->q)) - list_move(queue->q.next, work_list); - spin_unlock_irq(&queue->q_lock); - return !list_empty(work_list); -} - static void wait_for_work(struct drbd_connection *connection, struct list_head *work_list) { DEFINE_WAIT(wait); struct net_conf *nc; int uncork, cork; - dequeue_work_item(&connection->sender_work, work_list); + dequeue_work_batch(&connection->sender_work, work_list); if (!list_empty(work_list)) return; |