Posts Tagged ‘KVM’

I’m a big fan of FreeBSD. However, as painful it is to admit, it isn’t always the best OS to run in the cloud. Compared to Linux, you will get worse network and disk performance even with Virtio installed. There are also other issues. For instance, it is likely that you won’t get CARP to fully work (while this works perfectly fine with OpenBSD’s CARP, and Linux’s VRRP). I have written about workarounds for this issue in the past, but they do not seem to work equally well in FreeBSD 9.0.

Luckily, there is a userland implementation of CARP called UCARP that works better than CARP. It’s also very similar to CARP when it comes to configuration.
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In the previous post, I benchmarked three different virtual network drivers under FreeBSD. The clear winner was, perhaps not very surprisingly, the VirtIO network driver.

In this article I will do some further benchmarking and try to optimize the driver further. Similarly to in the last post, I will use two FreeBSD 9.0 boxes with 2GB RAM and 2GHz CPU. Both nodes are set up with a private network and running in a public cloud (at CloudSigma).

As many of you might know, running tests in a public cloud is difficult. For instance, you can’t control the load other nodes puts on the host resources and network architecture. To cope with this, I ran all tests five times with a 60 second sleep in between. This of course, isn’t perfect, but it is at least better than a single test.
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With the launch of FreeBSD 9, I was curious to learn how the VirtIO driver performed. I’ve seen a significant boost in disk performance, but how about the network driver?

Luckily, that’s rather easy to find the answer to. I spun up two FreeBSD 9 nodes on CloudSigma and configured them with VirIO (just like in this guide) and a private network. Once they were up and running, I installed Iperf and started testing away.

I had three different network drivers that I wanted to benchmark:

  • Intel PRO/1000 (Intel 82540EM chipset)
  • RealTek RTL8139
  • VirtIO (QEMU/KVM)

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Some time ago, I wrote about how to use Virtio with FreeBSD 8.2. As I pointed out in the article, the performance was not nearly as good in FreeBSD 8.2 as it was in 9.0-RC1. Hence I wanted to get all my nodes over to 9.0 as soon as possible to take use of the massive boost in I/O performance.

In this article I will walk you through the process of updating an existing system from FreeBSD 8.2 (without Virtio) to 9.0 with Virtio.

If you’re just curious on how to get Virtio working on a fresh FreeBSD 9.0 installation, skip to Step 2.
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How to use Virtio on FreeBSD 8.2+

October 20, 2011 9:08 am    Posted by Viktor Petersson    Comments (7)

In the past few years, virtualization has been the big topic everybody keeps talking about. There are good reasons for that, but one thing that really annoys me as a hardcore FreeBSD-fan is how poorly FreeBSD performs virtualized.

For some time, the Linux-community have been using the Virtio-drivers to boost both I/O and network performance. Simply put, Virtio is a driver written to cut out any unnecessary emulation on the host and as a result both reduce load from the host and improve performance.

Unfortunately the FreeBSD-community haven’t been able to utilize this, as there were no port for this. Luckily that just changed and here’s how you enable it.

Just as a disclosure, I’ve only tried the I/O driver on CloudSigma, and it seems to be stable both on 8.2 and 9.0-RC1. According to other this post, the network driver should work too though. It should however be said that the I/O performance on 8.2 is significantly slower than on 9.0-RC1.
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