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

[Michal Privoznik]

On 10/26/2017 10:38 AM, Ashish Kurian wrote:
> Hi Yalan and Michal,
> 
> Thank you for your response. So what I understand is that I can change
> rx_queue size even if I use direct type interface and qemu driver as long
> as the driver is virtio. Am I right? 

Yes.

> If that is the case why am I getting
> the error saying that
> 
> error: XML document failed to validate against schema: Unable to validate
> doc against /usr/share/libvirt/schemas/domain.rng
> Extra element devices in interleave
> Element domain failed to validate content

What's your libvirt version? For rx_queue_size you need 2.3.0 or newer.
For tx_queue_size you need 3.7.0 or newer (not that there's one yet).

> 
> for the following xml config? Btw I changed vepa to bridged mode hoping it
> would help me. Also note that I tried the following without any driver name
> and it still failed.
> 
> 
> <interface type='direct'>
>       <mac address='52:54:00:72:f9:eb'/>
>       <source dev='enp7s0f0' mode='bridge'/>
>       <model type='virtio'/>
>       <driver name='qemu' queues='5' rx_queue_size='512'>
>         <host csum='off' gso='off' tso4='off' tso6='off' ecn='off'
> ufo='off' mrg_rxbuf='off'/>
>         <guest csum='off' tso4='off' tso6='off' ecn='off' ufo='off'/>
>       </driver>
> 

This works for me. I'm running recent git.

Michal