Running VirtualBox 5.2.8r121009 on an Ubuntu 16.04LTS host. Download speeds from the hosts are a fraction of what they should be whereas upload speeds seem unaffected.
Machine I'm testing from is on a 100Mb wired connection. The server has 3x 1Gb links. 'Download' and 'Upload' are wrt the VirtualBox host/guests.
Upload and Download to/from the VirtualBox Host is confirmed at running at roughly line speed by iperf (95mbps on a 100mbps connection)
Upload to Windows/Linux VMs run at roughly equal speeds (94mbps on a 100mbps connection)
DL from Windows/Linux VMs run at a fraction of the speeds to the host (2-7mbps on the same 100mbps connection).
I've established where the issue comes from and its to do with the network configuration on the host.![Oracle virtualbox 6 Oracle virtualbox 6](https://www.virtualbox.org/manual/images/ovf-import.png)
The issue arises when the VMs run a bridged interface (virtio) off br0.
There is no issue when the Ubuntu host creates VLAN interfaces from br0 and the VMs use these as their bridgeadadpter.![Virtualbox 6 0 6 fraction calculator Virtualbox 6 0 6 fraction calculator](https://i.postimg.cc/YS0mgLcN/teams.jpg)
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Machine I'm testing from is on a 100Mb wired connection. The server has 3x 1Gb links. 'Download' and 'Upload' are wrt the VirtualBox host/guests.
Upload and Download to/from the VirtualBox Host is confirmed at running at roughly line speed by iperf (95mbps on a 100mbps connection)
Upload to Windows/Linux VMs run at roughly equal speeds (94mbps on a 100mbps connection)
DL from Windows/Linux VMs run at a fraction of the speeds to the host (2-7mbps on the same 100mbps connection).
I've established where the issue comes from and its to do with the network configuration on the host.
![Oracle virtualbox 6 Oracle virtualbox 6](https://www.virtualbox.org/manual/images/ovf-import.png)
6 Divided By 0
The Ubuntu host has 2x 1G interfaces bonded into bond0. This LACP interface is then bridged with a 3rd 1G interface to form the bridged interface br0The issue arises when the VMs run a bridged interface (virtio) off br0.
There is no issue when the Ubuntu host creates VLAN interfaces from br0 and the VMs use these as their bridgeadadpter.
Virtualbox 6.1
![Virtualbox 6 0 6 fraction calculator Virtualbox 6 0 6 fraction calculator](https://i.postimg.cc/YS0mgLcN/teams.jpg)