Reply to post: Spectre on the hyperthreads

OpenBSD disables Intel’s hyper-threading over CPU data leak fears

Claptrap314 Silver badge

Spectre on the hyperthreads

This was actually the vector of attack that designers were seriously concerned about fifteen years ago. It's a bit surprising to me that it has taken this long for this to come up.

However.....

Two threads per core ==> very easy to snoop on the other thread.

Four threads per core ==> much harder to know which thread you are snooping on.

Also, if an application says to the OS, "Please start this thread for me. I trust it to play nice with my main thread." I'm hard pressed to understand why the OS should say, "no".

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