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

[Michal Privoznik]

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