Hi Rob, thanks for the reply. The performance of Linux under a second level VM always seemed unpredictable to me but after reading your response I started seeing a pattern: whenever I had a poorly performing application on Linux on a second level VM, there was always some kind of networking involved which in turn involved waiting on open sockets. I just want to ensure I am understanding correctly what your are saying: Is it true that waits under software SIE burn CPU where the same waits under hardware SIE do not? That would explain a lot of the performance problems I have seen but I am sure there are caveats.
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