This element has been introduced in fe053dbea7, but isn't documented yet. After exactly 6 years I guess we can finally document it. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- docs/formatdomain.html.in | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in index 39f5a8823..30cb19626 100644 --- a/docs/formatdomain.html.in +++ b/docs/formatdomain.html.in @@ -4975,6 +4975,9 @@ qemu-kvm -net nic,model=? /dev/null &lt;model type='virtio'/&gt; <b>&lt;backend tap='/dev/net/tun' vhost='/dev/vhost-net'/&gt;</b> &lt;driver name='vhost' txmode='iothread' ioeventfd='on' event_idx='off' queues='5'/&gt; + <b>&lt;tune&gt; + &lt;sndbuf&gt;1600&lt;/sndbuf&gt; + &lt;/tune&gt;</b> &lt;/interface&gt; &lt;/devices&gt; ...</pre> @@ -4985,7 +4988,12 @@ qemu-kvm -net nic,model=? /dev/null device path (<code>/dev/vhost-net</code>) for devices with <code>virtio</code> model. The <code>tap</code> attribute overrides the tun/tap device path (default: <code>/dev/net/tun</code>) for network and bridge interfaces. This does not work - in session mode. + in session mode. <span class="since">Since 1.2.9</span> + </p> + <p> + For tap devices there is also <code>sndbuf</code> element which can + adjust the size of send buffer in the host. <span class="since">Since + 0.8.8</span> </p> <h5><a name="elementsNICSTargetOverride">Overriding the target element</a></h5> -- 2.11.0