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Message-Id: <1432531444-50193-3-git-send-email-jasowang@redhat.com> Date: Mon, 25 May 2015 01:23:59 -0400 From: Jason Wang <jasowang@...hat.com> To: mst@...hat.com, virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Cc: rusty@...tcorp.com.au, Jason Wang <jasowang@...hat.com> Subject: [RFC V7 PATCH 2/7] 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 last_used_idx as the used even to prevent the callbacks. Signed-off-by: Jason Wang <jasowang@...hat.com> --- drivers/virtio/virtio_ring.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 096b857..a83aebc 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -538,6 +538,7 @@ 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->last_used_idx); } EXPORT_SYMBOL_GPL(virtqueue_disable_cb); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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