The 4GB read performance between KVM and VirtualBox were similar, but still noticeably slower than the native test.
Ending out our testing, the KVM hypervisor had the worst performance when it came to the Intel IOMeter File Server Access Pattern option through the Flexible IO Tester. Sun xVM VirtualBox was twice as slow as the host, but KVM was five times slower than the host.
Linux's Kernel-based Virtual Machine performed quite well in a number of tests when compared to the host OS speed and VirtualBox, but particularly when it came to the disk-related tests KVM did not fair well at all. As you can see from the graphs though, VirtualBox though also had a few areas where its performance was lackluster.
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