With the exception of determining the interface name of the desired VF, all the steps of this method can be done using the virt-manager GUI. Summary When using the macvtap method of connecting an SR-IOV VF to a VM, the host device model had a dramatic effect on all parameters, and there was no host driver information listed regardless of configuration. The NIC ports on each system were in the same subnet: This tutorial evaluates three of those ways: Using the Command Line Once the VF has been created, the network adapter driver automatically creates the infrastructure necessary to use it. See Step 1 above.
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Using the Command Line Step 1: I built the driver from source and then loaded it into the kernel.
Configure SR-IOV Network Virtual Functions in Linux* KVM*
The fact that there are two MAC addresses assigned to the same VF—one by the host OS and one by the VM—suggests that the network stack using this configuration is more complex and likely slower. Network Configuration The test setup included two physical servers—net2s22c05 and net2s18c03—and one 82595 was hosted on net2s22c Determine the VF interface name.
However, the connection performance varies by a factor of depending on which host device model is selected. I used version 2.
The command I ran on the server system was. The test setup included two physical servers—net2s22c05 and net2s18c03—and one VM—sr-iov-vf-testvm—that was hosted on net2s22c The NIC ports on each system were in the same subnet: See Step 1 above. If you must use the macvtap method, use virtio as your device model because every other option will give you horrible performance.
This tutorial evaluates three of those ways: I additionally evaluated the following: If you must use this method of connecting the VF to a VM, be sure to use virtio as the host device model. Scope This tutorial does not focus on performance.
Downloads for Intel® ER Fast Ethernet Controller
8259 After the desired VF comes into focus, click Finish. No link speed was listed in that configuration, the VM used the virtio-pci driver, and iperf performance was roughly line rate for the 10 Gbps adapters. Share Tweet Share Send. See the commands from Step 1 above. Additional Findings In every configuration, the test VM was able to communicate with both the host and with the external traffic generator, and the VM was able to continue kinux with the external traffic generator even when the host PF had no IP address assigned to it as long as the PF link state on the host remained up.
Downloads for Intel® PRO/ S Desktop Adapter
Otherwise, newer versions would have been used. This tutorial does not focus on performance. Once the VF has been created, the network adapter driver automatically creates the infrastructure necessary to use it.
On the left side, click Network to add a network adapter to the VM. With the exception of determining the interface name of the desired VF, all the steps lihux this method can be done using the virt-manager GUI. There are a few downloads associated with this tutorial that you can get from github. The primary disadvantage of this method is that you cannot select which VF you wish to insert into the VM because KVM manages it automatically, whereas with the other two insertion options you can select which Linuxx to use.
To autostart the network when the host machine boots, select the Autostart box so that the text changes from Never to On Boot.
Add an interface tag to the VM. Additionally, I found that when all 4 VFs were inserted simultaneously using the virtual network adapter pool method into the VM and iperf ran simultaneously on all 4 network connections, each connection still maintained the same performance as if run separately.
Hypervisor default which llnux our configuration defaulted to rtl rtl e virtio Additional options were available on our test host machine, but they had to be entered into the VM XML definition using virsh edit.
Additional options were available on our oinux host machine, but they had to be entered into the VM XML definition using virsh edit. List physical network adapters that have VFs defined.
Selecting virtio as the host device model clearly provided the best performance. While the XL performed better than the 10 Gb NICs, it performed at roughly 70 percent line rate when the iperf server ran on the VM, and at roughly 40 percent line rate when the iperf client was on the VM. Display all virtual networks.