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vhost: prefetch available ring

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Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Signed-off-by: Zhihong Wang <zhihong.wang@intel.com>
Reviewed-by: Jianbo Liu <jianbo.liu@linaro.org>
Tested-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Yuanhan Liu 2016-10-14 17:34:37 +08:00
parent f689586bc0
commit 45847f015d
1 changed files with 2 additions and 0 deletions

2
lib/librte_vhost/virtio_net.c

@ -536,6 +536,8 @@ virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id,
if (count == 0)
return 0;
rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
vq->shadow_used_idx = 0;
for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;