Originally posted by waxhead
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Benchmarking Retpoline Underflow Protection With Intel Skylake/Kabylake
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Originally posted by caligula View Post
Intel fanboys won't buy AMD even if it was both faster and cheaper.
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Originally posted by caligula View Post
Intel fanboys won't buy AMD even if it was both faster and cheaper.
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Thanks for taking the time to put this together, very interesting.
However, I'm surprised you mentioned Skylake and Kabylake but didn't mention Coffeelake. Was that just an omission, or does Coffeelake not require the _underflow?
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With performance losses like this, it makes me wonder if this puts the 1950X over the edge in terms of IPC vs the 7980X (non-E).
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Benchmarking Retpoline Underflow Protection With Intel Skylake/Kabylake
Phoronix: Benchmarking Retpoline Underflow Protection With Intel Skylake/Kabylake
Beyond the Retpoline support already found in the mainline Linux kernel, developers are working on Retpoline Underflow support that would be used for Intel Skylake and Kabylake CPUs. RETPOLINE_UNDERFLOW protects against falling back to a potentially poisoned indirect branch predictor when a return buffer underflows and this additional protection is needed for Intel Skylake/Kabylake processors. I ran a couple benchmarks...
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