matheusfontes commented on PR #7333:
URL: https://github.com/apache/cloudstack/pull/7333#issuecomment-4117506981
We had to implement this change using the
agent.hooks.libvirt_vm_xml_transformer.script hook on KVM hosts to enable
multiqueue for Virtual Routers.
After applying <driver name='vhost' queues='X'/> to virtio interfaces, we
observed a significant improvement in throughput, confirming that VRs are
currently limited by single-queue virtio by default.
It may be worth considering extending support for these NIC settings to
System VMs (Virtual Routers, Internal LB), since they can become network
bottlenecks in high-throughput environments.
A possible approach could be to leverage System Offering External Details,
where key/value pairs are already supported. For example:
• nic.packed.virtqueues.enabled
• nic.multiqueue.number
This would provide a clean, native and persistent way to tune virtio NIC
performance for System VMs, avoiding the need for custom libvirt hooks.
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