linux_dsm_epyc7002/drivers/infiniband
Sebastian Sanchez ade6f8af52 IB/hfi1: Get rid of divide when setting the tx request header
Div instructions show costly in profiles when
the tx request header is set. Using right shift
instead of a divide operation reduces the cycles
spent in the function that sets the tx request
header as shown in the profile. Use right shift
operation instead.

Profile before change:
43.24%  009
|
|--23.41%-- user_sdma_send_pkts
|          |
|          |--99.90%-- hfi1_user_sdma_process_requestAfter:

Profile after change:
45.75%  009
|
|--14.81%-- user_sdma_send_pkts
|          |
|          |--99.95%-- hfi1_user_sdma_process_request

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@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>
2017-05-04 19:31:46 -04:00
..
core infiniband: avoid dereferencing uninitialized dst on error path 2017-05-02 10:45:45 -04:00
hw IB/hfi1: Get rid of divide when setting the tx request header 2017-05-04 19:31:46 -04:00
sw IB/rxe: Don't clamp residual length to mtu 2017-05-01 14:42:58 -04:00
ulp IB/ipoib: add get_link_ksettings in ethtool 2017-05-04 19:31:46 -04:00
Kconfig IB/opa-vnic: Virtual Network Interface Controller (VNIC) netdev 2017-04-20 12:01:38 -04:00
Makefile IB/rdmavt: Create module framework and handle driver registration 2016-03-10 20:37:04 -05:00