diff options
| author | Vennila Megavannan <vennila.megavannan@intel.com> | 2016-02-10 01:29:49 +0300 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2016-03-11 04:38:07 +0300 |
| commit | bfee5e32e701b98634b380a9eef8b5820feb7488 (patch) | |
| tree | 2d88caba4531edaee754643fdb943450765f0ca8 /drivers/infiniband/sw | |
| parent | 773d0451685b96f157ccd617a5e9cd9d3fa7d986 (diff) | |
| download | linux-bfee5e32e701b98634b380a9eef8b5820feb7488.tar.xz | |
IB/rdmavt, staging/rdma/hfi1: use qps to dynamically scale timeout value
A busy_jiffies variable is maintained and updated when rc qps are
created and deleted. busy_jiffies is a scaled value of the number
of rc qps in the device. busy_jiffies is incremented every rc qp
scaling interval. busy_jiffies is added to the rc timeout
in add_retry_timer and mod_retry_timer. The rc qp scaling interval
is selected based on extensive performance evaluation of targeted
workloads.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Vennila Megavannan <vennila.megavannan@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/sw')
| -rw-r--r-- | drivers/infiniband/sw/rdmavt/qp.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/rdmavt/qp.c b/drivers/infiniband/sw/rdmavt/qp.c index 439213c37537..7dc837c6554b 100644 --- a/drivers/infiniband/sw/rdmavt/qp.c +++ b/drivers/infiniband/sw/rdmavt/qp.c @@ -685,6 +685,19 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd, } rdi->n_qps_allocated++; + /* + * Maintain a busy_jiffies variable that will be added to the timeout + * period in mod_retry_timer and add_retry_timer. This busy jiffies + * is scaled by the number of rc qps created for the device to reduce + * the number of timeouts occurring when there is a large number of + * qps. busy_jiffies is incremented every rc qp scaling interval. + * The scaling interval is selected based on extensive performance + * evaluation of targeted workloads. + */ + if (init_attr->qp_type == IB_QPT_RC) { + rdi->n_rc_qps++; + rdi->busy_jiffies = rdi->n_rc_qps / RC_QP_SCALING_INTERVAL; + } spin_unlock(&rdi->n_qps_lock); if (qp->ip) { @@ -1223,6 +1236,10 @@ int rvt_destroy_qp(struct ib_qp *ibqp) spin_lock(&rdi->n_qps_lock); rdi->n_qps_allocated--; + if (qp->ibqp.qp_type == IB_QPT_RC) { + rdi->n_rc_qps--; + rdi->busy_jiffies = rdi->n_rc_qps / RC_QP_SCALING_INTERVAL; + } spin_unlock(&rdi->n_qps_lock); if (qp->ip) |