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We are testing the virtlet VM network throughput, and found the throughput is 2-3x slower compared to our openstack VM. The client and server are in same rack, it only has 3 to 4 Gbits/sec.
We are testing the virtlet VM network throughput, and found the throughput is 2-3x slower compared to our openstack VM. The client and server are in same rack, it only has 3 to 4 Gbits/sec.
After we dig more, found the csum/tso...(run
ethtool -k interface
) of vm tap interface are off. By consulting libvirt/qemu source code, found we missed a flag when configuring the tap device, at code https://github.com/Mirantis/virtlet/blob/master/pkg/nettools/tap_linux.go#L58, add one more flag:qemu will set the tso on if the host supports it.
After the change, the throughput is same as our openstack VM.
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