Poor network performance on OpenStack GRE or VXLAN tenant network
Issue
- Network Bandwidth of OpenStack Virtual Machine is Too Slow
- My RHOS instances are too slow to communicate from outside
- Bandwidth of compute and virtual machines calculated by iperf3 tool is drastically different:
- MTU size is wrong causing packet to drop and ssh commands to hang on OpenStack instances
Compute Node
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 1.01 GBytes 866 Mbits/sec 226 sender
[ 4] 0.00-10.00 sec 1.01 GBytes 866 Mbits/sec receiver
Virtual Machine
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-15.50 sec 256 KBytes 135 Kbits/sec 76 sender
[ 4] 0.00-15.50 sec 128 KBytes 67.6 Kbits/sec receiver
Environment
- Red Hat OpenStack 4.0
- Red Hat OpenStack 5.0
- GRE or VXLAN tenant network
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