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>
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@ -5561,6 +5561,7 @@ int drbd_asender(struct drbd_thread *thi)
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* rv < expected: "woken" by signal during receive
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* rv == 0 : "connection shut down by peer"
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*/
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received_more:
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if (likely(rv > 0)) {
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received += rv;
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buf += rv;
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@ -5636,6 +5637,11 @@ int drbd_asender(struct drbd_thread *thi)
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expect = header_size;
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cmd = NULL;
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}
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if (test_bit(SEND_PING, &connection->flags))
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continue;
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rv = drbd_recv_short(connection->meta.socket, buf, expect-received, MSG_DONTWAIT);
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if (rv > 0)
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goto received_more;
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}
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if (0) {
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@ -1994,22 +1994,13 @@ static bool dequeue_work_batch(struct drbd_work_queue *queue, struct list_head *
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return !list_empty(work_list);
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}
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static bool dequeue_work_item(struct drbd_work_queue *queue, struct list_head *work_list)
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{
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spin_lock_irq(&queue->q_lock);
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if (!list_empty(&queue->q))
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list_move(queue->q.next, work_list);
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spin_unlock_irq(&queue->q_lock);
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return !list_empty(work_list);
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}
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static void wait_for_work(struct drbd_connection *connection, struct list_head *work_list)
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{
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DEFINE_WAIT(wait);
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struct net_conf *nc;
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int uncork, cork;
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dequeue_work_item(&connection->sender_work, work_list);
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dequeue_work_batch(&connection->sender_work, work_list);
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if (!list_empty(work_list))
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return;
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