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I'd love to see proper testing of all the current chips from both AMD and Intel with Specter v2 mitigations applied. Performance hits of up to 50% are being sho
by JohnTHaller 5y ago
I'd love to see proper testing of all the current chips from both AMD and Intel with Specter v2 mitigations applied. Performance hits of up to 50% are being shown in some workloads.
- paulmd 5y agoAMD really also should be benched with KPTI turned on, since they've got a Meltdown-style vulnerability (discovered by the same team) they've left unpatched because "KPTI fixes it", but they also want KPTI off-by-default because it tanks their benchmarks. It also completely breaks KASLR (and that's been broken on AMD for a while thanks to prior work from the same team). https://mlq.me/download/amdprefetch.pdf https://mlq.me/download/amdprefetch.pdf Sadly people don't seem to take AMD vulnerabilities very seriously, Specter/Meltdown were trumpeted from the rooftops but when AMD leaves vulnerable defaults because mitigations would tank their benchmarks then it's fine, and everyone continues to benchmark in vulnerable configurations since it's "manufacturer-recommended". There seems to be a mindset for many that because the initial vulnerabilities didn't affect AMD that they're invulnerable forever.
- throwoutway 5y agoThere will be many mort such security issues. So dual benchmarks should be standardized from here on out: With protections turned on With protections turned off
- jeffbee 5y agoI can't think of anything less relevant for gaming workloads than spec. ex. security. In that use case you'd obviously disable all of the mitigations, to get the highest possible speculative performance.