Linux KVM Continues Offering Much Better Out-Of-The-Box Performance Than VirtualBox

Written by Michael Larabel in Software on 30 December 2018 at 08:06 AM EST.
VirtualBox 6.0 vs. KVM vs. Bare Linux Benchmarks
VirtualBox 6.0 vs. KVM vs. Bare Linux Benchmarks
VirtualBox 6.0 vs. KVM vs. Bare Linux Benchmarks
VirtualBox 6.0 vs. KVM vs. Bare Linux Benchmarks

Even with the fixed-size VBOX disk and all tests being off the same Samsung 970 EVO NVMe SSD, the out-of-the-box VirtualBox storage performance is much slower than KVM... Of course, there is the possibility to setup alternative storage mediums but at least for the default experience, KVM was much faster.

VirtualBox 6.0 vs. KVM vs. Bare Linux Benchmarks
VirtualBox 6.0 vs. KVM vs. Bare Linux Benchmarks
VirtualBox 6.0 vs. KVM vs. Bare Linux Benchmarks
VirtualBox 6.0 vs. KVM vs. Bare Linux Benchmarks

For CPU benchmarks with all three test configurations having access to 16 CPU cores, the VirtualBox performance tended to be a great deal slower than KVM. As for the KVM performance, it varies based upon the particular benchmark how close the performance was to the bare metal configuration.

VirtualBox 6.0 vs. KVM vs. Bare Linux Benchmarks

In many tests, the KVM overhead was quite small.


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