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vhost: restrict pointer aliasing for packed ring

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Restrict pointer aliasing to allow the compiler to vectorize loop
more aggressively.

With this patch, a 9.6% improvement is observed in throughput for
the packed virtio-net PVP case, and a 2.8% improvement in throughput
for the packed virtio-user PVP case. All performance data are measured
on ThunderX-2 platform under 0.001% acceptable packet loss with 1 core
on both vhost and virtio side.

Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Phil Yang <phil.yang@arm.com>
Acked-by: Adrián Moreno <amorenoz@redhat.com>
This commit is contained in:
Joyce Kong 2020-07-10 10:38:50 +08:00 committed by David Marchand
parent c92b936fbd
commit 58902736a4
2 changed files with 10 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/net/virtio/virtio_rxtx_simple_neon.c
View File

@ -36,8 +36,9 @@
* - nb_pkts < RTE_VIRTIO_DESC_PER_LOOP, just return no packet
*/
uint16_t
virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf
**__rte_restrict rx_pkts, uint16_t nb_pkts)
virtio_recv_pkts_vec(void *rx_queue,
struct rte_mbuf **__rte_restrict rx_pkts,
uint16_t nb_pkts)
{
struct virtnet_rx *rxvq = rx_queue;
struct virtqueue *vq = rxvq->vq;

14
lib/librte_vhost/virtio_net.c
View File

@ -1353,8 +1353,8 @@ virtio_dev_rx_single_packed(struct virtio_net *dev,
static __rte_noinline uint32_t
virtio_dev_rx_packed(struct virtio_net *dev,
struct vhost_virtqueue *vq,
struct rte_mbuf **pkts,
struct vhost_virtqueue *__rte_restrict vq,
struct rte_mbuf **__rte_restrict pkts,
uint32_t count)
{
uint32_t pkt_idx = 0;
@ -1439,7 +1439,7 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
uint16_t
rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
struct rte_mbuf **pkts, uint16_t count)
struct rte_mbuf **__rte_restrict pkts, uint16_t count)
{
struct virtio_net *dev = get_device(vid);
@ -2671,9 +2671,9 @@ free_zmbuf(struct vhost_virtqueue *vq)
static __rte_noinline uint16_t
virtio_dev_tx_packed_zmbuf(struct virtio_net *dev,
struct vhost_virtqueue *vq,
struct vhost_virtqueue *__rte_restrict vq,
struct rte_mempool *mbuf_pool,
struct rte_mbuf **pkts,
struct rte_mbuf **__rte_restrict pkts,
uint32_t count)
{
uint32_t pkt_idx = 0;
@ -2707,9 +2707,9 @@ virtio_dev_tx_packed_zmbuf(struct virtio_net *dev,
static __rte_noinline uint16_t
virtio_dev_tx_packed(struct virtio_net *dev,
struct vhost_virtqueue *vq,
struct vhost_virtqueue *__rte_restrict vq,
struct rte_mempool *mbuf_pool,
struct rte_mbuf **pkts,
struct rte_mbuf **__rte_restrict pkts,
uint32_t count)
{
uint32_t pkt_idx = 0;