[dpdk-dev] [PATCH] vhost: vhost injects interrupts to guest for each packet
Huawei Xie
huawei.xie at intel.com
Mon Sep 21 10:16:14 CEST 2015
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 at intel.com>
---
lib/librte_vhost/vhost_rxtx.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/lib/librte_vhost/vhost_rxtx.c b/lib/librte_vhost/vhost_rxtx.c
index 0d07338..9d3165a 100644
--- a/lib/librte_vhost/vhost_rxtx.c
+++ b/lib/librte_vhost/vhost_rxtx.c
@@ -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((int)vq->callfd, 1);
}
- return count;
+ return pkt_idx;
}
uint16_t
--
1.9.3
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