[libvirt-users] how to disable vnet_hdr through libvirt

JIANFENG TANG jtang at riverbed.com
Thu Mar 6 15:46:18 UTC 2014


Daniel P. Berrange <berrange at ...> writes:

> 
> On Tue, Mar 04, 2014 at 03:56:06PM +0000, Jianfeng Tang wrote:
> > Thank you Daniel. How difficult to extend libvirt for this? One critical
> > application on my VM needs to turn vnet_hdr off.
> 
> Can you explain why in more detail. We don't expose this as a configurable
> setting because we don't believe there's any compelling reason to disable
> it. ie it offers clear performance benefits with no downsides.
> 
> Regards,
> Daniel


No special reason. Just in my case I was told to turn off vnet_hdr in order
to make my VM work properly. 

I have two choices: extend libvirt or switch to use qemu command.

I asked them to fix it in their product, but it is out of my control and it
did not fit in my timeline.




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