Hello,
I am having troubles with hardware vxlan offloading when
the tx_checksumming is turned on.
Here is my environment:
GuestVM1 ---> VM1 (running in ESXi 6.7 Hypervisor1) <--VxLAN tunnel--> VM2
(running in ESXi 6.7 Hypervisor2) ---> GuestVM2
The VM1 and VM2 are responsible for creating openflow flows using VxLAN
tunnels to route the traffic between the GuestVMs.
I have created all the required configurations to route the traffic and
everything works fine. However, when I try to enable VxLAN offloading,
using the parameters below:
VM1 (transmitter):
...
tx-checksumming: on
tx-checksum-ipv4: off [fixed]
tx-checksum-ip-generic: on
tx-checksum-ipv6: off [fixed]
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
...
tx-udp_tnl-segmentation: on
tx-udp_tnl-csum-segmentation: on
...
The throughput between GustVM1 ---> GuestVM2 is less than 5Mbps.
After googling around, I turned off the tx_checksumming on the transmitter
side and everything works well. (I can see 10Gbps traffic going through but
the CPU usage is terrible)
VM1 (transmitter):
...
tx-checksumming: off
tx-checksum-ipv4: off [fixed]
tx-checksum-ip-generic: off
tx-checksum-ipv6: off [fixed]
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
...
tx-udp_tnl-segmentation: on
tx-udp_tnl-csum-segmentation: on
...
This issue doesn't exist when I use the Linux-bridge for connecting the VM1
and VM2.
I was wondering if there is an issue with openvswitch when I keep the
tx_checsumming on?
And I am using the following NICs which are capable of VxLAN offloading:
Mellanox Technologies MT27710 Family [ConnectX-4 Lx]
Driver Info:
Bus Info: 0000:3b:00:0
Driver: nmlx5_core
Firmware Version: 14.23.1020
Version: 4.15.10.3
Thank you,
Amir
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