Re: [libvirt-users] Need to increase the rx and tx buffer size of my interface

On 10/26/2017 09:38 AM, Ashish Kurian wrote:

Hi Yalan,

In the previous email you mentioned "tx_queue_size='512' will not work in the guest with direct type interface, in fact, no matter what you set, it will not work and guest will get the default '256'. "

So if I am using macvtap for my interfaces, then the device type will always be direct type. Does it mean that there is no way I can increase the buffer size with the macvtap interfaces?

Correct. However, this is limitation of qemu. You should talk to them to find out if there are plans to extend the implementation. BTW: rx_queue_size should work with any backend as long as the model is virtio (obviously). Michal