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authorMike Marciniszyn <mike.marciniszyn@intel.com>2015-12-24 11:19:23 -0500
committerDoug Ledford <dledford@redhat.com>2016-01-19 15:41:16 -0500
commit967bcfc0f5744c1553545883bbb43df1d41cbb5c (patch)
tree99935ff2d23a85c76deced854ab49da6a043b51b /drivers
parentIB/mlx4: Advertise RoCE v2 support (diff)
downloadlinux-dev-967bcfc0f5744c1553545883bbb43df1d41cbb5c.tar.xz
linux-dev-967bcfc0f5744c1553545883bbb43df1d41cbb5c.zip
IB/qib: Improve ipoib UD performance
Based on profiling, UD performance drops in case of processes in a single client due to excess context switches when the progress workqueue is scheduled. This is solved by modifying the heuristic to select the direct progress instead of the scheduling progress via the workqueue when UD-like situations are detected in the heuristic. Reviewed-by: Vinit Agnihotri <vinit.abhay.agnihotri@intel.com> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to '')
-rw-r--r--drivers/infiniband/hw/qib/qib_verbs.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/infiniband/hw/qib/qib_verbs.c b/drivers/infiniband/hw/qib/qib_verbs.c
index 0e020e2ceed2..baf1e42b6896 100644
--- a/drivers/infiniband/hw/qib/qib_verbs.c
+++ b/drivers/infiniband/hw/qib/qib_verbs.c
@@ -346,6 +346,7 @@ static int qib_post_one_send(struct qib_qp *qp, struct ib_send_wr *wr,
unsigned long flags;
struct qib_lkey_table *rkt;
struct qib_pd *pd;
+ int avoid_schedule = 0;
spin_lock_irqsave(&qp->s_lock, flags);
@@ -438,11 +439,15 @@ static int qib_post_one_send(struct qib_qp *qp, struct ib_send_wr *wr,
qp->ibqp.qp_type == IB_QPT_RC) {
if (wqe->length > 0x80000000U)
goto bail_inval_free;
+ if (wqe->length <= qp->pmtu)
+ avoid_schedule = 1;
} else if (wqe->length > (dd_from_ibdev(qp->ibqp.device)->pport +
- qp->port_num - 1)->ibmtu)
+ qp->port_num - 1)->ibmtu) {
goto bail_inval_free;
- else
+ } else {
atomic_inc(&to_iah(ud_wr(wr)->ah)->refcount);
+ avoid_schedule = 1;
+ }
wqe->ssn = qp->s_ssn++;
qp->s_head = next;
@@ -458,7 +463,7 @@ bail_inval_free:
bail_inval:
ret = -EINVAL;
bail:
- if (!ret && !wr->next &&
+ if (!ret && !wr->next && !avoid_schedule &&
!qib_sdma_empty(
dd_from_ibdev(qp->ibqp.device)->pport + qp->port_num - 1)) {
qib_schedule_send(qp);