"We believe that Retpoline-based protection is the best-performing solution for Variant 2 on current hardware", reads another excerpt.
Sixth generation Skylake CPUs take the biggest hit from Intel and Microsoft's mitigations, especially in system responsiveness tests which are running at a 21% performance deficit from an unpatched system. It is quietly advising some customers to hold off installing patches that address new security flaws affecting virtually all of its processors.
As companies are trying to recover from what were, and still are, perhaps the most severe CPU bugs in the history of the computer, people are wondering how exactly does this affect them.More news: WINTER STORM | See here for latest forecasts, closings
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After an effort that Sloss described as a "moonshot", Google engineers were able to devise a software fix for the Intel processor problem that didn't result in a slowdown, and that had no other significant side effects.
After all, there's currently no known exploit for Spectre or Meltdown and while exploits will certainly emerge now that the details are known, it's unclear how effective they will be and whether they can be successfully deployed in the real world. WSJ got its hands on a document Intel has been sending out, which recommends that customers "delay additional deployments of these microcode updates" while it figures out the reboot issue.
Swathes of CPUs have been hit by security flaws that have been lying dormant within them for years.
Since the second version of Spectre needs a different fix, AMD will also provide its customers and partners for Ryzen and EPYC processors with a patch for its chips starting this week. ARM says around 5 percent of more than 120 billion chips using its designs shipped since 1991 were impacted by Spectre and significantly fewer by Meltdown.