diff options
| author |   Mike Marciniszyn <mike.marciniszyn@intel.com> | 2018-05-15 18:31:24 -0700 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@mellanox.com> | 2018-05-24 09:39:25 -0600 |
| commit | 3ce459cd684b7f18ca79838e62310ffdc930920b (patch) | |
| tree | debe30b90ad8f1220da686232988446ddc59d471 /drivers/infiniband/sw/rdmavt | |
| parent | IB/hfi1: Set port number for errorinfo MAD response (diff) | |
| download | linux-dev-3ce459cd684b7f18ca79838e62310ffdc930920b.tar.xz linux-dev-3ce459cd684b7f18ca79838e62310ffdc930920b.zip | |
IB/{rdmavt,hfi1}: Change hrtimer add to use pinned version
Given we are dealing with nano-second level timers, when the timer
pops, ensure it happens on the CPU which caused the timer to be set
in the first place. This avoids excessive jitter from the desired
expiration time by avoiding the cost of switching our context to
another CPU that is cache cold for this given timer.
Reviewed-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/sw/rdmavt')
| -rw-r--r-- | drivers/infiniband/sw/rdmavt/qp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/infiniband/sw/rdmavt/qp.c b/drivers/infiniband/sw/rdmavt/qp.c index 6e9a351f45fb..40046135c509 100644 --- a/drivers/infiniband/sw/rdmavt/qp.c +++ b/drivers/infiniband/sw/rdmavt/qp.c @@ -2225,7 +2225,7 @@ void rvt_add_rnr_timer(struct rvt_qp *qp, u32 aeth) to = rvt_aeth_to_usec(aeth); trace_rvt_rnrnak_add(qp, to); hrtimer_start(&qp->s_rnr_timer, - ns_to_ktime(1000 * to), HRTIMER_MODE_REL); + ns_to_ktime(1000 * to), HRTIMER_MODE_REL_PINNED); } EXPORT_SYMBOL(rvt_add_rnr_timer); |