Surprising new feature in AMD Ryzen 3000

Re:Surprising new feature in AMD Ryzen 3000 by segfaultbuserr on Friday August 28, 2020 @09:04AM (#24304336)

    -march=arch -mtune=arch

has existed for decades, and the performance improvement is measurable. But mainstream distributions often cannot take advantage, since they need to support all CPUs, and optimization for one is often a deoptimization for another. It's also a reason why Gentoo exists.

Interestingly, Intel's Clear Linux - a optimization-oriented distribution - uses

    -march=westmere -mtune=haswell

https://docs.01.org/clearlinux/latest/guides/clear/performan...

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Re:Surprising new feature in AMD Ryzen 3000 by marmaduke on Friday August 28, 2020 @04:54PM (#24309821)

Westmere is pretty old but significantly is the first generation to support virtual machines with little overhead. If clear Linux allowed something newer then it would rule itself out for a lot of existing machines (such as the 20+ I have running HPC jobs with surprising reliability)

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Re:Surprising new feature in AMD Ryzen 3000 by segfaultbuserr on Friday August 28, 2020 @05:52PM (#24310465)

Yeah, it's a reasonable tradeoff - be compatible with 1st Gen (basically all post-2010 modern x86_64 Intel processors), but try fine-tuning it a little bit for Haswell.

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