Reply to post: Re: A Kludge

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

Tom Womack

Re: A Kludge

The whole point of hyper threading is that it works well on code which *hasn't* been thoroughly optimised. If you've got two vector instructions lined up for each tick, hyper threading can't get you anything; if your thread is waiting two hundred ticks for the L3 cache to divulge the next operand, having another thread running until it too needs to wait for the L3 cache is extremely helpful.

I am very sad at the way that people are using fairly hypothetical security arguments to disable the features that make processors actually good at computing: I am willing to do my banking on my phone if that means my actual computers can crunch numbers at a higher percentage of its peak speed.

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