Benchmark Armv8 VMM
chris-hofer at zehha.de
Wed May 6 13:23:59 CEST 2020
to measure the performance overhead of the Armv8 Genode VMM, I ran some
benchmarks (cyclictest and lmbench). I compared it against a native
Linux installation on the Imx8-evk board (same kernel version). For some
measurements (for example fork + executing /bin/sh from lmbench), I
observe counter-intuitive results in the sense that the virtualized
version runs *faster* than the native one (Vm 1,1ms vs. native 2,5ms).
My understanding is, that the virtual timer offset (cntvoff_el2) is not
used and thus, the guest sees wall clock time. I would expect that the
virtualization incurs an overhead and this overhead manifests itself in
longer (wall clock) time measurements.
Do you have any explanation for this or give me a hint on how to confirm
correctness of measurements?
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