Restrict pointer aliasing to allow the compiler to vectorize loops
more aggressively.
With this patch, a 9.6% improvement is observed in throughput for
the virtio-net PVP case, and a 2.4% perf improvement in throughput
for the virtio-user PVP case. All performance data are measured
on ThunderX-2 platform under the 0.001% acceptable packet loss with
2 cores on the vhost side and 1 core on the virtio side.
Signed-off-by: Joyce Kong <joyce.k...@arm.com>
Reviewed-by: Phil Yang <phil.y...@arm.com>
---
drivers/net/virtio/virtio_rxtx_simple_neon.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/virtio/virtio_rxtx_simple_neon.c
b/drivers/net/virtio/virtio_rxtx_simple_neon.c
index 8e6fa1fd7..a9b649814 100644
--- a/drivers/net/virtio/virtio_rxtx_simple_neon.c
+++ b/drivers/net/virtio/virtio_rxtx_simple_neon.c
@@ -36,8 +36,8 @@
* - nb_pkts < RTE_VIRTIO_DESC_PER_LOOP, just return no packet
*/
uint16_t
-virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **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;
--
2.27.0
