A reason #meltdown is so important now, and possibly why it wasn’t discovered earlier in the public, is only recently have our environments shifted significantly to co-tenancy (AWS, Azure, GCP...). The attack is meaningful due to target change.
Think big picture.
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I truthfully do not recall. I have vague recollections of the 360/91--a supercomputer for its day--having it, but it didn't have cache except for a very small instruction cache for "loop mode".
@Koenig_Software, do you remember? -
360/91 had out of order execution, which implies prefetch, but I I’m not sure of its branch prediction capability.
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