[RndTbl] Zenbleed

Wed Jul 26 01:52:45 CDT 2023

Yeah, I've always had misgivings and unease about speculative execution.  For the few % of further gain in performance, the risks are just not worth it.  Remember the Intel Pentium floating-point division bug?  ("United we stand, divided we fall", "We are number 0.9999999997", etc.)

Hartmut

On Wed 26 Jul 2023 at 01:22:50 -05:00, Trevor Cordes <trevor at tecnopolis.ca> wrote:
> On 2023-07-25 Alberto Abrao wrote:
> > Here we go again...
> 
> It is continuing to appear that speculative execution as a model is
> irretrievably broken.  Maybe a new model is required.  Or maybe NUMA
> was the correct solution, not SMP.
> 
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