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back to article Release the brakes on your virtual servers

One of the dirty little secrets of virtualisation is the performance cost: operating systems running inside a virtual machine are slower than those running natively on the same hardware, sometimes by quite some margin. This is termed virtualisation overhead, and with current whole-system virtualisation, it's a given. It always …

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Linux

Native Perfomance is here today...

In Linux it's called Containers and a package called OpenVZ has been about for a while and the newer LXC is becoming quite popular now. The down-side? Just one kernel running all those containers rather than a hypervisor running individual "PCs" each with their own kernels - that means you can't run 2 different OSs, although with care you can run 2 different Linux distributions as long as they're both happy with the same kernel.

This technique isn't new either - Solaris and FreeBSD have had similar features for a long time and LXC for Linux while part of the stable kernel isn't perfect yet, but it's good enough for me to use in production in the data centre. 100% native performance in each container with none of this virtualisation wastage.

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I'd take issue with the first sentence. Windows XP running under VirtualBox inside an Ubuntu landlord performs better than it does on bare metal. I surmise that Linux's ability to use more RAM, and generally to manage resources better, offers XP benefits equivalent to caching on all hardware accesses.

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Anonymous Coward

Until

Until you try to access the video card from the VM....hacked drivers at best.

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