Benchmarking AMD Zen 3 With Predictive Store Forwarding Disabled

[coder]

This feaure mainly helps to speedup in multimedia and matrix operations/instruction

Do you have any sources on this (other than the ones in your post, which are unrelated to PSF)?

[Peter Fodrek]

Do you have any sources on this (other than the ones in your post, which are unrelated to PSF)?

Zen 3's Predictive Store Forwarding aims to enhance performance by trying to predict dependencies between loads and stores. PSF can speculatively execute instructions based on what it thinks the result of the load will be and while the predictions should be largely accurate, there is the possibility of incorrect CPU speculation.

https://www.phoronix.com/scan.php?page=news_item&px=AMD-PSF-Security-Analysis

PSF acts as a alternative to link form FPU part exit to FPU aprt entry in Core


that is misisng in K8 a Zen as well


from

https://www.anandtech.com/show/1998/4

[smitty3268]

Found one comment online that the SPEC benchmarks might be impacted by this feature.

No idea if that's true or not.