[ctz]

Note that the AVX-512 code we're referring to is the code that Intel also contributed to OpenSSL.

As a side-note, I believe the CPU we tested this on does not suffer from the AVX-512 power limits reported with earlier AVX-512 parts. https://travisdowns.github.io/blog/2020/08/19/icl-avx512-fre... seems to confirm that.

[anitil]

~That page is the first I've heard of license-based downclocking. I know there's no ethical reason not to do it, and it's similar to fusing a higher/lower performance chip out of the same base design, and free-market etc.

But it just makes me sad.~

Edit: Based of this comment [0] and replies, it appears I've misunderstood what 'license' means. My apologies

[0] https://news.ycombinator.com/item?id=24218310

[cesaref]

Ah, ok. So the frequency locking was to reduce jitter on the performance tests? If so, this makes sense.

[carlmr]

It's also fairly normal to do this. Google benchmark [1] even warns you about this.

[1] https://github.com/google/benchmark

[rerdavies]

Is it really reasonable to lock your TLS web transfer to a specific CPU thread? Not sure it actually does make sense.

Would be nice to see the non-AVX512 results.