Hi, I'm continuing with testing ...
It seems this issue is related to virtio driver. Virtio driver is used by default with the option use_virtio_for_bridges=true in nova-compute.conf, if this option is disabled instances are created with a RTL-8139 network interface and the bandwidth between it and its router appears to be as expected without disabling TSO: iperf -c 10.0.0.1 ------------------------------------------------------------ Client connecting to 10.0.0.1, TCP port 5001 TCP window size: 23.5 KByte (default) ------------------------------------------------------------ [ 3] local 10.0.0.19 port 51554 connected with 10.0.0.1 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 145 MBytes 121 Mbits/sec On the other hand, bandwidth between instances running on the same compute node is ~ 3 Gbits/sec with virtio driver. More info: - OVS: 2.3.0 - Linux kernel 3.16-3 - In-tree version of kernel openvswitch module Cheers Alberto
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