[libvirt-users] Question about disabling UFO on guest

[Yalan Zhang]

Hi Bao,

Then I reboot my node to get the change effect and it works. However, can I
disable the UFO without touching the host OS? or it always has to disable
on both host and guest like that?
As I know, if you want to disable both for receive and transmit,  it can
only be turned off via 'host_ufo=off,gso=off,guest_ufo=off'.
<driver>
<host gso='off' ufo='off'/> ===> for receive
<guest ufo='off'/> ====> for transmit
 </driver>

Reference: https://bugzilla.redhat.com/show_bug.cgi?id=1387477#c4


-------
Best Regards,
Yalan Zhang
IRC: yalzhang


On Sun, Dec 24, 2017 at 1:57 AM Bao Nguyen <baondt at gmail.com> wrote:

> Hello everyone,
>
> I would like to ask a question regarding to disable UFO of virtio vNIC in
> my guest. I have read the document at
> https://libvirt.org/formatdomain.html
>
>
> *host*
>
> The csum, gso, tso4, tso6, ecn and ufo attributes with possible
> values on and off can be used to turn off host offloading options. By
> default, the supported offloads are enabled by QEMU. *Since 1.2.9 (QEMU
> only)* The mrg_rxbuf attribute can be used to control mergeable rx
> buffers on the host side. Possible values are on (default) and off. *Since
> 1.2.13 (QEMU only)*
>
> *guest*
>
> The csum, tso4, tso6, ecn and ufo attributes with possible
> values on and off can be used to turn off guest offloading options. By
> default, the supported offloads are enabl
>
> ed by QEMU.
> *Since 1.2.9 (QEMU only)*
>
>
> Then I disabled UFO on my vNIC on guest as the following configuration
>
> <devices>
>
>   <interface type='network'>
>
>     <source network='default'/>
>
>     <target dev='vnet1'/>
>
>     <model type='virtio'/>
>
>     <driver name='vhost' txmode='iothread' ioeventfd='on' event_idx='off'
> queues='5' rx_queue_size='256' tx_queue_size='256'>
>
>       *<host gso='off' ufo='off' />*
>
>       *<guest ufo='off'/>*
>
>     </driver>
>
>
>
>   </interface>
>
> </devices>
>
>
> Then I reboot my node to get the change effect and it works. However, can
> I disable the UFO without touching the host OS? or it always has to disable
> on both host and guest like that?
>
>
> Thanks,
>
> Brs,
>
> Natsu
>
>
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> libvirt-users at redhat.com
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