From: Xueming Li <xuemingl@nvidia.com>
Date: Wed, 2 Dec 2020 23:36:41 +0000 (+0000)
Subject: vdpa/mlx5: default polling mode delay time to zero
X-Git-Url: http://git.droids-corp.org/?p=dpdk.git;a=commitdiff_plain;h=c9a189f4ea365c40fd3296581014684f770249f6

vdpa/mlx5: default polling mode delay time to zero

To improve performance and latency, this patch sets Rx polling mode
default delay time to zero.

Signed-off-by: Xueming Li <xuemingl@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---

diff --git a/drivers/vdpa/mlx5/mlx5_vdpa.h b/drivers/vdpa/mlx5/mlx5_vdpa.h
index d039ada65b..08e04a86c4 100644
--- a/drivers/vdpa/mlx5/mlx5_vdpa.h
+++ b/drivers/vdpa/mlx5/mlx5_vdpa.h
@@ -36,7 +36,7 @@
 #define VIRTIO_F_RING_PACKED 34
 #endif
 
-#define MLX5_VDPA_DEFAULT_TIMER_DELAY_US 100u
+#define MLX5_VDPA_DEFAULT_TIMER_DELAY_US 0u
 #define MLX5_VDPA_DEFAULT_TIMER_STEP_US 1u
 
 struct mlx5_vdpa_cq {
diff --git a/drivers/vdpa/mlx5/mlx5_vdpa_event.c b/drivers/vdpa/mlx5/mlx5_vdpa_event.c
index fd6150928b..d108ca90ba 100644
--- a/drivers/vdpa/mlx5/mlx5_vdpa_event.c
+++ b/drivers/vdpa/mlx5/mlx5_vdpa_event.c
@@ -266,7 +266,8 @@ mlx5_vdpa_timer_sleep(struct mlx5_vdpa_priv *priv, uint32_t max)
 			break;
 		}
 	}
-	usleep(priv->timer_delay_us);
+	if (priv->timer_delay_us)
+		usleep(priv->timer_delay_us);
 }
 
 static void *