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vdpa/mlx5: set polling mode default delay to zero

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To improve throughput and latency, this patch allows Rx polling timer
delay to 0us.

Signed-off-by: Xueming Li <xuemingl@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Xueming Li 2020-12-02 23:36:40 +00:00 committed by Ferruh Yigit
parent 9ef38ddba3
commit 6956a48cab
2 changed files with 4 additions and 8 deletions
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3
doc/guides/vdpadevs/mlx5.rst
View File

@ -125,8 +125,7 @@ Driver options
- 0, A nonzero value to set timer step in micro-seconds. The timer thread
dynamic delay change steps according to this value. Default value is 1us.
- 1, A nonzero value to set fixed timer delay in micro-seconds. Default value
is 100us.
- 1, A value to set fixed timer delay in micro-seconds. Default value is 0us.
- ``no_traffic_time`` parameter [int]

9
drivers/vdpa/mlx5/mlx5_vdpa.c
View File

@ -651,12 +651,9 @@ mlx5_vdpa_config_get(struct rte_devargs *devargs, struct mlx5_vdpa_priv *priv)
return;
rte_kvargs_process(kvlist, NULL, mlx5_vdpa_args_check_handler, priv);
rte_kvargs_free(kvlist);
if (!priv->event_us) {
if (priv->event_mode == MLX5_VDPA_EVENT_MODE_DYNAMIC_TIMER)
priv->event_us = MLX5_VDPA_DEFAULT_TIMER_STEP_US;
else if (priv->event_mode == MLX5_VDPA_EVENT_MODE_FIXED_TIMER)
priv->event_us = MLX5_VDPA_DEFAULT_TIMER_DELAY_US;
}
if (!priv->event_us &&
priv->event_mode == MLX5_VDPA_EVENT_MODE_DYNAMIC_TIMER)
priv->event_us = MLX5_VDPA_DEFAULT_TIMER_STEP_US;
DRV_LOG(DEBUG, "event mode is %d.", priv->event_mode);
DRV_LOG(DEBUG, "event_us is %u us.", priv->event_us);
DRV_LOG(DEBUG, "no traffic time is %u s.", priv->no_traffic_time_s);