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Message-Id: <1423471165-34243-3-git-send-email-jasowang@redhat.com> Date: Mon, 9 Feb 2015 03:39:21 -0500 From: Jason Wang <jasowang@...hat.com> To: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, virtualization@...ts.linux-foundation.org, mst@...hat.com Cc: pagupta@...hat.com, Jason Wang <jasowang@...hat.com> Subject: [PATCH RFC v5 net-next 2/6] virtio_ring: try to disable event index callbacks in virtqueue_disable_cb() Currently, we do nothing to prevent the callbacks in virtqueue_disable_cb() when event index is used. This may cause spurious interrupts which may damage the performance. This patch tries to publish avail event as the used even to prevent the callbacks. Signed-off-by: Jason Wang <jasowang@...hat.com> --- drivers/virtio/virtio_ring.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 545fed5..e9ffbfb 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -539,6 +539,8 @@ void virtqueue_disable_cb(struct virtqueue *_vq) struct vring_virtqueue *vq = to_vvq(_vq); vq->vring.avail->flags |= cpu_to_virtio16(_vq->vdev, VRING_AVAIL_F_NO_INTERRUPT); + vring_used_event(&vq->vring) = cpu_to_virtio16(_vq->vdev, + vq->vring.avail->idx); } EXPORT_SYMBOL_GPL(virtqueue_disable_cb); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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