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drbd: Improve asender performance

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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>
This commit is contained in:
Lars Ellenberg 2014-09-11 14:29:11 +02:00 committed by Jens Axboe
parent b47a06d105
commit abde9cc6a5
2 changed files with 7 additions and 10 deletions
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6
drivers/block/drbd/drbd_receiver.c
View File

@ -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) {

11
drivers/block/drbd/drbd_worker.c
View File

@ -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;