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>
unsigned int hfi1_max_mtu = HFI1_DEFAULT_MAX_MTU;
module_param_named(max_mtu, hfi1_max_mtu, uint, S_IRUGO);
unsigned int hfi1_max_mtu = HFI1_DEFAULT_MAX_MTU;
module_param_named(max_mtu, hfi1_max_mtu, uint, S_IRUGO);
-MODULE_PARM_DESC(max_mtu, "Set max MTU bytes, default is 8192");
+MODULE_PARM_DESC(max_mtu, "Set max MTU bytes, default is " __stringify(
+ HFI1_DEFAULT_MAX_MTU));
unsigned int hfi1_cu = 1;
module_param_named(cu, hfi1_cu, uint, S_IRUGO);
unsigned int hfi1_cu = 1;
module_param_named(cu, hfi1_cu, uint, S_IRUGO);
#define HLS_UP (HLS_UP_INIT | HLS_UP_ARMED | HLS_UP_ACTIVE)
/* use this MTU size if none other is given */
#define HLS_UP (HLS_UP_INIT | HLS_UP_ARMED | HLS_UP_ACTIVE)
/* use this MTU size if none other is given */
-#define HFI1_DEFAULT_ACTIVE_MTU 8192
+#define HFI1_DEFAULT_ACTIVE_MTU 10240
/* use this MTU size as the default maximum */
/* use this MTU size as the default maximum */
-#define HFI1_DEFAULT_MAX_MTU 8192
+#define HFI1_DEFAULT_MAX_MTU 10240
/* default partition key */
#define DEFAULT_PKEY 0xffff
/* default partition key */
#define DEFAULT_PKEY 0xffff
*/
static inline int verbs_mtu_enum_to_int(struct ib_device *dev, enum ib_mtu 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);
+ /* 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);
if (val > 0)
return val;
return ib_mtu_enum_to_int(mtu);