[ovs-discuss] H/w offloading list for OVS 1.2.2

[Dave Whitla]

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 <dave.whitla at ocean.net.au> 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.