Disabling Hyper-Threading for Spectre

Hardware

It’s too early to tell what the broad performance impact of the latest Spectre mitigations will be, but so far it’s clear as mud. Thomas Claburn wrote this for The Register:

The performance impact when Hyper-Threading is disabled is dependent on many factors. Measured impact ranges from a +30 per cent gain, to -50 per cent loss and beyond. Most HT testing, however, showed losses in the 0-30 per cent range.

We’re dealing with this at work at the moment. Fun times.

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