Well the Xen documentation specifically mentions it. The Debian Xen packages 
specifically create network config within VMs for it - as well as documenting 
the same.
And I have personally experienced it - the last time causing me me a couple of 
days of head scratching until I figured out how to disable hardware tx checksum 
offload on F5's LTM VE.

I can only comment from experience - if that's not good enough then I don't 
know what else I can offer.

Dave

On 16/12/2011, at 11:27 AM, Jesse Gross wrote:

> On Wed, Dec 14, 2011 at 11:21 PM, Dave Whitla <[email protected]> 
> wrote:
>> Sheili,
>> 
>> A particular case to be aware of is when combining Linux bridging with 
>> 802.1q vlans. Hardware tx checksum offload does not work properly in this 
>> scenario, so it is advisable to disable tx checksum offloading in virtual 
>> machines which connect to vifs mapped to a vlan or a trunk port to which 
>> untagged ports are also bridged. In my personal testing of OVS the same 
>> applies.
> 
> Again, that's simply not true or, at best, what you're describing is a
> generalization from a specific NIC/driver issue that you've seen.

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