virtio_net: parametrize the napi_weight for virtio receive queue.

It is done in order to improve performance.

Signed-off-by: Dor Laor <dor.laor@qumranet.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index a61c176..e66de0c 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -24,6 +24,9 @@
 #include <linux/virtio_net.h>
 #include <linux/scatterlist.h>
 
+static int napi_weight = 128;
+module_param(napi_weight, int, 0444);
+
 static int csum = 1, gso = 1;
 module_param(csum, bool, 0444);
 module_param(gso, bool, 0444);
@@ -353,7 +356,7 @@ static int virtnet_probe(struct virtio_device *vdev)
 
        /* Set up our device-specific information */
        vi = netdev_priv(dev);
-       netif_napi_add(dev, &vi->napi, virtnet_poll, 16);
+       netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
        vi->dev = dev;
        vi->vdev = vdev;