This page has been converted from the Fedora Project Wiki and cleaned up for publishing here on the Fedora Docs Portal, but it has not yet been reviewed for technical accuracy. This means any information on this page may be outdated or inaccurate. Reviews for technical accuracy are greatly appreciated. This document describes how to obtain virtIO drivers and additional software agents for Windows virtual machines running on kernel-based virtual machines KVM.
In addition, shipping pre-compiled sources is generally against Fedora policies. Microsoft does not provide virtIO drivers, you must download them yourself in order to make virtIO drivers available for Windows VMs running on Fedora hosts. The drivers in these repos are licensed under the GPLv2 license. You can then share the bits with Windows VMs running on the host. This repo is enabled by default. The builds may be bug free, development quality, or completely broken. Caveat emptor. This repo is disabled by default.
Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. I've set up several KVM based networks before, and never encountered this issue, can't for the life of me think what I'd have set up differently previously. All machines run CentOS6. X, base install with basic puppet driven configuration. All VM's are:. All VM's use virtio for network, block devices basically bog standard result of running the virt-install command -- e.
Nothing seems to have worked, has anyone encountered this much of a performance degradation before? It's a decent improvement, but I'm sure I can get closer to bare metal performance it's still a fair way under half at the moment. My first recommendation here is to upgrade both the host and guest's kernel. The stock CentOS 6. I'd suggest kernel-lt from ELRepo or kernel-ml if you're feeling brave. This should give you a decent boost in performance right off the bat.
Next up, try testing with iperf3 or even the older iperf. This will give you as close to a pure network connection as possible. RSync especially may not be doing sequential IO like your dd test try using fio instead. The interesting thing here is that VM to VM traffic will not actually hit the network controller.
This is going to be done purely on the host, so the rest of your network and the various offload settings don't really have any meaning here. One other thing to check: Has your server throttled down the CPUs? We've had a number of Dell machines think they were idle, and start running the CPU significantly slower then they should have been. The power saving stuff does not always recognize server workloads well. This gives the VM direct access to the physical NIC at the cost of loss of functionality, such as no nwfilter supportand will be more efficient.
You do not need this to get full gigabit speeds though.
How do I check the network speed of a virtio-net network interface?
Sign up to join this community. The best answers are voted up and rise to the top. Asked 6 years, 2 months ago. Active 6 years, 1 month ago. Viewed 20k times. All VM's are: Bridged to one of two physically separated networks i. Any other ideas? I've set these to off in a test just now, but hasn't helped as yet.
Creating Windows virtual machines using virtIO drivers
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To check the network connection speed I have used ethtool, but the speed it is showing as unknown. When I change the interface model to E, the speed it is showing as Mbps. How do I check the network speed in Linux guest OS for virtio nic interface? You can use iperf or iperf3 to get a rough estimate of what bandwidth is available between the VM and another device in the network, e.
I have an linux vm running on kvm with virtio-net, and I want to check the link speed. How can I do that? It seems that ethtool does not support virtio-net yet? I have the version 3. It seams version 6 is the newest one. I found one link that describes the problem in the redhat kbbut unfortunately I do not have an subscription to read it. Virtio is a para-virtualized driver, which means the OS and driver are aware that it's not a physical Device.
The driver is really an API between the guest and the hypervisor so it's speed is totally disconnected from any physical device or Ethernet standard. This is a good thing as this is faster than the hypervisor pretending to be a physical device and applying an arbitrary "link speed" concept to flow.
The VM just dumps frames onto a bus and it's the host's job to deal with the physical devices; no need for the VM to know or care what the link speed of hosts physical devices are. One of the advantages of this is that when packets are moving between 2 VMs on the same host they can send packets as fast as the host's CPU can move them from one set of memory to another, setting a "linkspeed" here just puts in an unneeded speed limit.
This also allows the host to do adaptor teaming and spread traffic across multiple links without every VM needing to be explicitly configured to get the full bandwidth of the setup. If you want to know how fast you can actually transfer data from your VM to another location you need to do actual throughput tests with tools like iperf.
To expand a bit on this because I too recently came into this and was also semi-confused by the lack of speed details when running ethtool on a VM:. With these drivers installed in your VM, the kernel in your VM has special access to the underlying hardware through the kernel that's running on your hypervisor. Remember that with hypervisors there's 2 distinct types.
Reminder on the types:. Given you're running on a paravirtualized hypervisor you have to go onto the actual hypervisor to find out your NIC's theoretical speed using ethtool. In lieu of that can only find out by doing something like using iperf to benchmark the NIC under load, and experimentally find out what the NICs speed appears to be.
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