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iser-target: Introduce isert_poll_budget

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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: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Sagi Grimberg 2014-12-02 16:57:44 +02:00 committed by Nicholas Bellinger
parent bdf20e7254
commit 37d9fe80a3
1 changed files with 7 additions and 1 deletions
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8
drivers/infiniband/ulp/isert/ib_isert.c
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@ -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);
}