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| author |   Sebastian Sanchez <sebastian.sanchez@intel.com> | 2016-04-12 11:17:09 -0700 |
|---|---|---|
| committer |   Doug Ledford <dledford@redhat.com> | 2016-04-28 16:32:27 -0400 |
| commit | ef699e849c081d8123d574b3aa279f4e550de4ad (patch) | |
| tree | 42898bc797265ecc6ecbdbe4c25ad032a35a8acb /drivers/staging/rdma/hfi1/qp.c | |
| parent | IB/hfi1: Simplify init_qpmap_table() (diff) | |
| download | linux-dev-ef699e849c081d8123d574b3aa279f4e550de4ad.tar.xz linux-dev-ef699e849c081d8123d574b3aa279f4e550de4ad.zip | |
IB/hfi1: Adjust default MTU to be 10KB
Increasing the default MTU size to 10KB improves performance
for PSM. Change the default MTU to 10KB but constrain
Verbs MTU to 8KB. Also update default MTU module parameter
description to be HFI1_DEFAULT_MAX_MTU.
Reviewed-by: Dean Luick <dean.luick@intel.com>
Reviewed-by: Mitko Haralanov <mitko.haralanov@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/staging/rdma/hfi1/qp.c')
| -rw-r--r-- | drivers/staging/rdma/hfi1/qp.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/staging/rdma/hfi1/qp.c b/drivers/staging/rdma/hfi1/qp.c index dc9119e1b458..91eb42316df9 100644 --- a/drivers/staging/rdma/hfi1/qp.c +++ b/drivers/staging/rdma/hfi1/qp.c @@ -167,8 +167,12 @@ static inline int opa_mtu_enum_to_int(int mtu) */ static inline int verbs_mtu_enum_to_int(struct ib_device *dev, enum ib_mtu mtu) { - int val = opa_mtu_enum_to_int((int)mtu); + int val; + /* Constraining 10KB packets to 8KB packets */ + if (mtu == (enum ib_mtu)OPA_MTU_10240) + mtu = OPA_MTU_8192; + val = opa_mtu_enum_to_int((int)mtu); if (val > 0) return val; return ib_mtu_enum_to_int(mtu); |