On 1/6/21 4:06 AM, Xueming Li wrote:
> The next parameters control the HW queue moderation feature.
> This feature helps to control the traffic performance and latency
> tradeoff.
>
> Each packet completion report from HW to SW requires CQ processing by SW
> and triggers interrupt for the guest driver. Interrupt report and
> handling cost CPU cycles and time and the amount of this affects
> directly on packet performance and latency.
>
> hw_latency_mode parameters [int]
> 0, HW default.
> 1, Latency is counted from the first packet completion report.
> 2, Latency is counted from the last packet completion.
> hw_max_latency_us parameters [int]
> 0 - 4095, The maximum time in microseconds that packet completion
> report can be delayed.
> hw_max_pending_comp parameter [int]
> 0 - 65535, The maximum number of pending packets completions in an HW
> queue.
>
> Signed-off-by: Xueming Li <xuemi...@nvidia.com>
> ---
> doc/guides/vdpadevs/mlx5.rst | 24 ++++++++++++++++++++++++
> drivers/vdpa/mlx5/mlx5_vdpa.c | 6 ++++++
> drivers/vdpa/mlx5/mlx5_vdpa.h | 3 +++
> drivers/vdpa/mlx5/mlx5_vdpa_virtq.c | 3 +++
> 4 files changed, 36 insertions(+)
Reviewed-by: Maxime Coquelin <maxime.coque...@redhat.com>
Thanks,
Maxime
