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Upon additional testing, if iperf is run with 10 threads, it can get up to about 6Gbps.

I am running PVE version 3.1-21. When I run VMs with VirtIO, I can achieve (within same host) VM to VM iperf performance ~10Gbps But when I use CTs (within same host), the iperf network performance is at highest about 1.5Gbps. There seems to be not much configuration to change (resources in...

nevermind, I was using a wrong interface (as my box has many network intf's). Just need to make sure in the network persistent rules which one eth0 is. ProxMox seems only enable eth0, because only that phy intf is used for the vmbr0 bridge.

I have a similar issue with Intel igb and nic with both PVE 3.1 and 3.2 installation. My server is running find - no network issue. But once I installed PVE, the nic link light is off as soon as PVE start booting. dmesg also show eth0 is up with right speed and duplex. But no link light or...