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90b2620e6a
linux/drivers/infiniband/hw
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Michael J. Ruhl 90b2620e6a IB/hfi1: Fix a latency issue for small messages 
A recent performance enhancement introduced a latency issue in the
HFI message path.  The new algorithm removed a forced call send for
PIO messages and added a forced schedule event for messages larger
than the MTU.

For PIO, the schedule path can introduce thrashing that can
significantly impact the throughput for small messages.

If a message size is within the PIO threshold, always take the send
path.

Fixes: 0b79b27748 ("IB/{hfi1, qib, rdmavt}: Schedule multi RC/UC packets instead of posting")
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
2018-12-03 16:05:19 -05:00
..
bnxt_re RDMA/bnxt_re: Avoid accessing the device structure after it is freed 2018-11-21 14:12:21 -07:00
cxgb3 RDMA/drivers: Use core provided API for registering device attributes 2018-10-17 03:45:01 -06:00
cxgb4 First merge window pull request 2018-10-26 07:38:19 -07:00
hfi1 IB/hfi1: Fix a latency issue for small messages 2018-12-03 16:05:19 -05:00
hns RDMA/hns: Bugfix pbl configuration for rereg mr 2018-11-23 13:11:47 -07:00
i40iw RDMA/drivers: Use core provided API for registering device attributes 2018-10-17 03:45:01 -06:00
mlx4 RDMA/drivers: Use core provided API for registering device attributes 2018-10-17 03:45:01 -06:00
mlx5 RDMA/mlx5: Initialize return variable in case pagefault was skipped 2018-11-29 15:16:45 -07:00
mthca RDMA/drivers: Use core provided API for registering device attributes 2018-10-17 03:45:01 -06:00
nes First merge window pull request 2018-10-26 07:38:19 -07:00
ocrdma RDMA/drivers: Use core provided API for registering device attributes 2018-10-17 03:45:01 -06:00
qedr RDMA/drivers: Use core provided API for registering device attributes 2018-10-17 03:45:01 -06:00
qib First merge window pull request 2018-10-26 07:38:19 -07:00
usnic RDMA/drivers: Use core provided API for registering device attributes 2018-10-17 03:45:01 -06:00
vmw_pvrdma RDMA/drivers: Use core provided API for registering device attributes 2018-10-17 03:45:01 -06:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00