Originally posted by Eirikr1848
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Benchmarking The Performance Impact To AMD Inception Mitigations
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Michael Larabel
https://www.michaellarabel.com/
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Can someone explain, do microcode fixes (generally, not just in this particular case) affect performance with mitigations=off or not? May it be beneficial to use old microcode? I am talking about a server running only trusted code where performance is top priority, if that matters.
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So are we still at the point where we can avoid all these speculative execution vulnerabilities by disabling hyperthreading? I might try that again. When Spectre and Meltdown first came out I tried disabling hyperthreading for a couple of weeks just to see how it would go, and I didn't notice any difference in running my regular office applications and browser. For me I only really need it for larger compile jobs since I don't game or do much else that's CPU intensive.
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Originally posted by Steffo View PostI always disable CPU mitigations. If I have malware on my system, my least problem are CPU attacks. I guess this is more about Cloud systems where one instance serves several customers.
At home just fscking around, playing games in my first world comfort - you're right I don't care.
But as soon as I pick up my laptop and travel into an airport or a consulate or any place with attackers and sniffers, I have reason to be cautious and worry. You can say "well, don't bring it! don't use it there!" But yet I must, sometimes its my own for long travel, sometimes its work for work reasons. I've had passwords that gave access to systems that had very sensitive data and literal definition spies would be in our building quite often (govt). You think thats not normal? We were just aware of it.
Again, I'm sure its just your game or home laptop, right? You don't have any keys or password managers and its all encrypted with elliptic curve based algos (along with your home drive too) and you follow some tight security standards like nist or fips or something ridiculous and you never do banking or have any credit card transactions go through especially on public wifi right? And you don't use that insecure device on the same home network as a work device, right?
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Originally posted by panikal View PostAgain, I'm sure its just your game or home laptop, right? You don't have any keys or password managers and its all encrypted with elliptic curve based algos (along with your home drive too) and you follow some tight security standards like nist or fips or something ridiculous and you never do banking or have any credit card transactions go through especially on public wifi right? And you don't use that insecure device on the same home network as a work device, right?
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Originally posted by vient View PostCan someone explain, do microcode fixes (generally, not just in this particular case) affect performance with mitigations=off or not? May it be beneficial to use old microcode? I am talking about a server running only trusted code where performance is top priority, if that matters.
.(* see https://archive.ph/vqB1 )
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Please retest with enable KASAN in kernel.
I noticed that KASAN + safe RATE decrease performance of 7950X in two times in games and kernel build.
Fedora Rawhide enable KASAN by default in debug builds.
Last edited by mv.gavrilov; 15 August 2023, 06:31 PM.
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Originally posted by V1tol View PostCPU manufacturers just got a new marketing trick to sell new processors.
Originally posted by Adarion View PostWell, besides a few tests it seemed pretty fine, nearly no change. Quite a relief. And maybe these database things can be polished in the future for a little less decrease in performance.
Yeah, some benches are virtually unaffected, but way too many are hit way too hard for such a dismissive attitude. IMO, this is pretty bad.
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