diff options
| author |   Mike Marciniszyn <mike.marciniszyn@qlogic.com> | 2011-09-23 13:16:49 -0400 |
|---|---|---|
| committer |   Roland Dreier <roland@purestorage.com> | 2011-10-21 09:38:56 -0700 |
| commit | d0f2faf72d51dacf5c5e8dec7dca22d0395896e2 (patch) | |
| tree | 9cdae5f02f9d17dac30c9a140123dc912d897278 /drivers/infiniband/hw/qib/qib_rc.c | |
| parent | IB/qib: Use RCU for qpn lookup (diff) | |
| download | linux-dev-d0f2faf72d51dacf5c5e8dec7dca22d0395896e2.tar.xz linux-dev-d0f2faf72d51dacf5c5e8dec7dca22d0395896e2.zip | |
IB/qib: Precompute timeout jiffies to optimize latency
A new field is added to qib_qp called timeout_jiffies. It is
initialized upon create and modify.
The field is now used instead of a computation based on qp->timeout.
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_rc.c')
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_rc.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/infiniband/hw/qib/qib_rc.c b/drivers/infiniband/hw/qib/qib_rc.c index 5d77cb8aa052..ecfa087ad45e 100644 --- a/drivers/infiniband/hw/qib/qib_rc.c +++ b/drivers/infiniband/hw/qib/qib_rc.c @@ -59,8 +59,7 @@ static void start_timer(struct qib_qp *qp) qp->s_flags |= QIB_S_TIMER; qp->s_timer.function = rc_timeout; /* 4.096 usec. * (1 << qp->timeout) */ - qp->s_timer.expires = jiffies + - usecs_to_jiffies((4096UL * (1UL << qp->timeout)) / 1000UL); + qp->s_timer.expires = jiffies + qp->timeout_jiffies; add_timer(&qp->s_timer); } @@ -1519,9 +1518,7 @@ read_middle: * 4.096 usec. * (1 << qp->timeout) */ qp->s_flags |= QIB_S_TIMER; - mod_timer(&qp->s_timer, jiffies + - usecs_to_jiffies((4096UL * (1UL << qp->timeout)) / - 1000UL)); + mod_timer(&qp->s_timer, jiffies + qp->timeout_jiffies); if (qp->s_flags & QIB_S_WAIT_ACK) { qp->s_flags &= ~QIB_S_WAIT_ACK; qib_schedule_send(qp); |