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authorPhilipp Reisner <philipp.reisner@linbit.com>2015-03-16 18:08:29 +0300
committerJens Axboe <axboe@fb.com>2015-11-25 19:22:01 +0300
commit668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6 (patch)
tree20c6ee044e5d91700bea7c3d3a601ecf3234753d /drivers/block/drbd/drbd_req.c
parent1c03e52083c8fa6e70a0b921d25d1916f68320fc (diff)
downloadlinux-668700b40a7c8727bbd2b3fd4fd22e0ce3f1aeb6.tar.xz
drbd: Create a dedicated workqueue for sending acks on the control connection
The intention is to reduce CPU utilization. Recent measurements unveiled that the current performance bottleneck is CPU utilization on the receiving node. The asender thread became CPU limited. One of the main points is to eliminate the idr_for_each_entry() loop from the sending acks code path. One exception in that is sending back ping_acks. These stay in the ack-receiver thread. Otherwise the logic becomes too complicated for no added value. 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>
Diffstat (limited to 'drivers/block/drbd/drbd_req.c')
-rw-r--r--drivers/block/drbd/drbd_req.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 3add7c5e97e0..7907fb562388 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -453,7 +453,7 @@ static void mod_rq_state(struct drbd_request *req, struct bio_and_error *m,
kref_get(&req->kref); /* wait for the DONE */
if (!(s & RQ_NET_SENT) && (set & RQ_NET_SENT)) {
- /* potentially already completed in the asender thread */
+ /* potentially already completed in the ack_receiver thread */
if (!(s & RQ_NET_DONE)) {
atomic_add(req->i.size >> 9, &device->ap_in_flight);
set_if_null_req_not_net_done(peer_device, req);