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docs: documentation for virtio packed option

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Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Signed-off-by: Bjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
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Bjoern Walk 2020-04-06 15:13:27 +02:00 committed by Ján Tomko
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@ -4372,6 +4372,16 @@
Possible values are <code>on</code> or <code>off</code>.
<span class="since">Since 3.5.0</span>
</p>
<p>
The attribute <code>packed</code> controls if QEMU should try to use
packed virtqueues. Compared to regular split queues, packed queues
consist of only a single descriptor ring replacing available and used
ring, index and descriptor buffer. This can result in better cache
utilization and performance. If packed virtqueues are actually used
depends on the feature negotiation between QEMU, vhost backends and guest
drivers. Possible values are <code>on</code> or <code>off</code>.
<span class="since">Since 6.3.0 (QEMU and KVM only)</span>
</p>
<h4><a id="elementsVirtioTransitional">Virtio transitional devices</a></h4>