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Description of problem:

Please refer the following patch/thread to OVS.

http://openvswitch.org/pipermail/dev/2015-August/059335.html

We found a significant performance benefit by enabling checksum on vxlan tunnels. We are using RHEL 7.1.

OVS 2.4 has support for setting the checksum on vxlan tunnels, and OVS 2.4 has a system of backports (for kernel modules) for 3.x kernels.

Can OVS 2.4 and its system of 3.x kernel backports be made available as part of the RHEL 7.1 distro ?

Alternatively, can the 3.x openvswitch kernel module be patched with the patch suggested in the above thread ?

Version-Release number of selected component (if applicable):

RHEL 7.1

How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:


Additional info:

Unfortunately, with upstream conversion to lwtunnels, we cannot do it the way the referenced patch does.

The correct way is to specify the needed tunnel flags (including checksumming flags) while creating the interface using rtnetlink API. However, upstream is still using the kernel compat layer to create the vxlan interface instead of rtnetlink.

It's first necessary to implement support for direct creation of lwtunnels using rtnetlink in Open vSwitch. The requested feature depends on this being done first. We're working on it.

I'm closing this, we set UDP csum by default for VXLAN now. Actually, we've being doing that for some time already.

Please reopen if there is still a problem with UDP csums not being enabled.