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Meltdown/Spectre week three: World still knee-deep in something nasty

bazza Silver badge

But we've also heard an industry-wide silence about CPU-makers’ roadmaps for a Meltdown-and-Spectre-free future. Rumours are rife that a generation of products will have to be redesigned, at unknowable expense and after un-guessable amounts of time.

It varies. Right now I'm not sure that Intel has anything in its product portfolios that you'd actually want to buy. AMD, Oracle SPARC and IBM Power are less affected but they still have to sort out Spectre.

So far as I can see the only sure way out of this is to not use speculative execution. Welcome back to the Dark Ages of CPU architectures. Things will get very slow...

Whilst there's a single cache, memory system and speculative execution there is no true fix for this. One could lock the cache whilst a branch is executing, but then you would have to wonder about thread preemption. It's a real mess.

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