Public bug reported:
Microsoft and Mellanox would like to request the following two commits
in the releases that run on Azure:
3f89b01f4bba IB/mlx5: Align usage of QP1 create flags with rest of mlx5 defines
11f552e21755 IB/mlx5: Test write combining support
These commits landed in mainline as of v5.5-rc1.
These commits will improved network performance of RDMA out of the VF
when WC can be used. The highest benefit is to RDMA and DPDK, but UCX
should also see improved latency.
The Mellanox driver uses WC to optimize posting work to the HCA, and
getting this wrong in either direction can cause a significant
performance loss. These patches prevent the possible performance loss.
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1874503
Title:
Mellanox Check For Write Combining Support
Status in linux-azure package in Ubuntu:
New
Bug description:
Microsoft and Mellanox would like to request the following two commits
in the releases that run on Azure:
3f89b01f4bba IB/mlx5: Align usage of QP1 create flags with rest of mlx5
defines
11f552e21755 IB/mlx5: Test write combining support
These commits landed in mainline as of v5.5-rc1.
These commits will improved network performance of RDMA out of the VF
when WC can be used. The highest benefit is to RDMA and DPDK, but UCX
should also see improved latency.
The Mellanox driver uses WC to optimize posting work to the HCA, and
getting this wrong in either direction can cause a significant
performance loss. These patches prevent the possible performance
loss.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1874503/+subscriptions
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