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Jeff Buell
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That's a bit off-topic, but do a search for LiquidVM. Not sure of the status of that project since Oracle bought BEA. Yes, in general you can do away with the OS.
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bolsen, There are two prefetch settings in the BIOS. One prefetches the next cache line (assumes memory is accessed sequentially). The other uses a more complex algorithm to predict which cache line will be needed next. Both algorithms fail for SPECjbb since it accesses memory mostly randomly. I haven't tested the performance effect recently, but enabling both prefetch settings will decrease performance on the order of 10%.
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Chris, Yes. Prefetch has very little interaction with virtualization. It's really an application-level optimization. Disabling prefetch is important for SPECjbb but other apps may perform better with it enabled.
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