Hi, i got with iperf: To a remote VM on different HOST: 10.8 Gb/s „TCP“ bandwidth. „UDP“ (-u) <= 1Kb/s + failed ACK last block To a local VM on same HOST: 11.1 Gb/s „TCP“ bandwidth. „UDP“ (-u) <= 1Mb/s + failed ACK last block VM’s run Linux Debian 8/9, virtio_net, guest tools installed, MTU 1500 HOST's have Intel Cards X540, MTU 1500 Possible did you run „UDP“ tests only ? Cheers Oliver

Am 09.03.2019 um 11:26 schrieb Leo David <leoalex@gmail.com>:

Hello Everyone, I have 10Gb connections setup for all the hosts in the cluster, for both management/vm and gluster traffic ( separate network cards ) The problem is that i just cannot pass 1Gb/s traffic between vms ( even between vms running on the same hosts ! - which makes the things more weird... ). Traffic measured by using iperf tool. Is there a way I can check waht could be the problem ? Network card type, vm drivers, any suggestion ? I just do not know where to look for a possible cause. Thank you very much !

Leo

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