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net/virtio: improve perf via one-way barriers on used flag
[dpdk.git]
/
drivers
/
net
/
virtio
/
virtio_user
/
virtio_user_dev.c
diff --git
a/drivers/net/virtio/virtio_user/virtio_user_dev.c
b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index
7911c39
..
1c575d0
100644
(file)
--- a/
drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/
drivers/net/virtio/virtio_user/virtio_user_dev.c
@@
-698,8
+698,8
@@
virtio_user_handle_cq_packed(struct virtio_user_dev *dev, uint16_t queue_idx)
if (vq->used_wrap_counter)
flags |= VRING_PACKED_DESC_F_AVAIL_USED;
if (vq->used_wrap_counter)
flags |= VRING_PACKED_DESC_F_AVAIL_USED;
- rte_smp_wmb();
-
vring->desc[vq->used_idx].flags = flags
;
+ __atomic_store_n(&vring->desc[vq->used_idx].flags, flags,
+
__ATOMIC_RELEASE)
;
vq->used_idx += n_descs;
if (vq->used_idx >= dev->queue_size) {
vq->used_idx += n_descs;
if (vq->used_idx >= dev->queue_size) {