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<base href="https://bugs.dpdk.org/">
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<body><table border="1" cellspacing="0" cellpadding="8" class="bz_new_table">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - disable vhost guest notification not work when split queue and VIRTIO_RING_F_EVENT_IDX negotiated"
href="https://bugs.dpdk.org/show_bug.cgi?id=1463">1463</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>disable vhost guest notification not work when split queue and VIRTIO_RING_F_EVENT_IDX negotiated
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>UNCONFIRMED
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>Normal
</td>
</tr>
<tr>
<th>Component</th>
<td>vhost/virtio
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>topchenfu@qq.com
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">in `lib/vhost/vhost.c`:
```
static inline int
vhost_enable_notify_split(struct virtio_net *dev,
struct vhost_virtqueue *vq, int enable)
{
if (vq->used == NULL)
return -1;
if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
if (enable)
vq->used->flags &= ~VRING_USED_F_NO_NOTIFY;
else
vq->used->flags |= VRING_USED_F_NO_NOTIFY;
} else {
if (enable)
vhost_avail_event(vq) = vq->last_avail_idx;
}
return 0;
}
```
when enable=0, this function do nothing when VIRTIO_RING_F_EVENT_IDX
negotiated, casued the guest do unnecessary kicks when sending & receiving.
it is a bug or feature?
</pre>
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