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vhost: inject only one interrupt for a batch of packets

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In merge-able RX path, vhost injects interrupts to guest for each packet.
This should degrade performance a lot.
This patch fixes this issue by injecting one interrupt for a batch of packets.

Signed-off-by: Huawei Xie <huawei.xie@intel.com>
Acked-by: Jianfeng Tan <jianfeng.tan@intel.com>
This commit is contained in:
Huawei Xie 2015-09-21 16:16:14 +08:00 committed by Thomas Monjalon
parent 9702b2b53f
commit 5dab2f1137
1 changed files with 5 additions and 2 deletions
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7
lib/librte_vhost/vhost_rxtx.c
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@ -496,7 +496,7 @@ virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id,
"to get enough desc from "
"vring\n",
dev->device_fh);
return pkt_idx;
goto merge_rx_exit;
} else {
update_secure_len(vq, res_cur_idx, &secure_len, &vec_idx);
res_cur_idx++;
@ -523,7 +523,10 @@ virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id,
*(volatile uint16_t *)&vq->used->idx += entry_success;
vq->last_used_idx = res_cur_idx;
}
merge_rx_exit:
if (likely(pkt_idx)) {
/* flush used->idx update before we read avail->flags. */
rte_mb();
@ -532,7 +535,7 @@ virtio_dev_merge_rx(struct virtio_net *dev, uint16_t queue_id,
eventfd_write(vq->callfd, (eventfd_t)1);
}
return count;
return pkt_idx;
}
uint16_t