Commit 37d9fe80 authored by Sagi Grimberg's avatar Sagi Grimberg Committed by Nicholas Bellinger
Browse files

iser-target: Introduce isert_poll_budget 



In case the CQ is packed with completions, we can't just
hog the CPU forever. Poll until a sufficient budget (currently
hard-coded to 64k completions) and if budget is exhausted, bailout
and give a chance to other threads.

Signed-off-by: default avatarSagi Grimberg <sagig@mellanox.com>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent bdf20e72

drivers/infiniband/ulp/isert/ib_isert.c

+7 −1
Original line number Diff line number Diff line
@@ -2044,13 +2044,19 @@ isert_handle_wc(struct ib_wc *wc) 
static void

isert_cq_work(struct work_struct *work)

{

	enum { isert_poll_budget = 65536 };

	struct isert_comp *comp = container_of(work, struct isert_comp,

					       work);

	int completed = 0;

	struct ib_wc wc;



	while (ib_poll_cq(comp->cq, 1, &wc) == 1)

	while (ib_poll_cq(comp->cq, 1, &wc) == 1) {

		isert_handle_wc(&wc);



		if (++completed >= isert_poll_budget)

			break;

	}



	ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);

}