[ovs-dev] [PATCH RFC] - vxlan udp csum and openstack ovs performance

Ramu Ramamurthy sramamur at linux.vnet.ibm.com
Fri Aug 28 02:07:56 UTC 2015

On 2015-08-27 18:26, Jesse Gross wrote:
> On Thu, Aug 27, 2015 at 5:46 PM, Ramu Ramamurthy
> <sramamur at linux.vnet.ibm.com> wrote:
>> We found that enabling UDP checksums for vxlan triggers GRO on the 
>> receiver,
>> and boosts the vxlan performance to 8+ Gbps.
>> Hence, we want to enable vxlan csum for OVS vxlan tunnels. This is 
>> already
>> supported in OVS 2.4, and kernel versions 4+ - But we
>> want this fix to appear in 3.x upstream kernels, and the corresponding
>> userspace change in OVS 2.3.
> Sorry, this isn't going to happen. Neither the upstream kernel nor OVS
> backport features to already released versions.
> OVS 2.4 has been released with this feature and is packaged with a
> kernel module of backports. Please just use that - considering that
> you'd have to make changes all the way up the stack, I don't think
> it's any more disruptive.

We cannot change the base distribution - we are using RHEL 7 (3.x 

So, you are suggesting to use OVS 2.4 userspace components, and
build the openvswitch kernel-module
shipped with OVS 2.4 along with its dependencies (vxlan, etc) also 
with OVS 2.4  against the RHEL 7.1 (3.x kernel)  - and not use any of 
upstream components for openvswitch, vxlan etc ?

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