AMD Inception Mitigations Cause 20% Performance Drop in Database Servers

Unfortunate, but I guess it&#x27;s a bit like how safety regulations make building slower but we accept it for the far, far fewer workers dying or being maimed in accidents...<p>Is this Inception issue the kind of thing that can be solved more efficiently in silicon with future generations, or is the mitigation something we have to accept and just go for faster processors to make up for it in the future?

Apologies if I ask a stupid question: is it necessary to run the mitigations on a database server?

Other workloads with noticeable performance hits (at least relevant to my day to day work):<p>* Code compilation - Linux kernel compilation takes ~15% longer with any of the mitigations on. LLVM and Node compilation are less substantial for kernel only, or safe RET microcode fix, but still ~15% longer for the IBPD mitigation. Though the Linux kernel gap seems much smaller (~7%) when tested on desktop ryzen (zen 4) instead of EPYC (zen 3)<p>* Numpy benchmark - at least ~10% loss with mitigations (on EPYC)<p>* nginx - at least ~15% with loss with mitigations (on EPYC)<p>Most other impacts limited to less than 5% (if any).

Too bad <a href="https:&#x2F;&#x2F;make-linux-fast-again.com&#x2F;" rel="nofollow noreferrer">https:&#x2F;&#x2F;make-linux-fast-again.com&#x2F;</a> isn&#x27;t loading anymore. Anyone knows an up to date guide for disabling all mitigations? I found <a href="https:&#x2F;&#x2F;gist.github.com&#x2F;jfeilbach&#x2F;f06bb8408626383a083f68276fa4df8a" rel="nofollow noreferrer">https:&#x2F;&#x2F;gist.github.com&#x2F;jfeilbach&#x2F;f06bb8408626383a083f68276f...</a> but it was last updated in March (?).<p>Also is there an equivalent for Windows?

Related story (5 days ago)<p>&quot;Intel&#x27;s Downfall Mitigations Drop Performance Up to 39%, Tests Show&quot;: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=37085043">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=37085043</a>

I discovered this myself yesterday. I suddenly saw a drop in performance after an update and ran a phoronix benchmark I have been running to see results from my overclock. I got a 5s (~8% ) increase in timed Linux kernel compilation.<p>I turned mitigations off and was back to normal. I was going to try to figure it out today, but this is probably it.

Actual title: &quot;Benchmarking The Performance Impact To AMD Inception Mitigations&quot;

Honest question, what are the real world impacts of these kind of vulnerabilities? If I am running a few on-premises private servers where I control all the software, should I be worried?

By the time the security bullies are done &quot;fixing&quot; my CPU, I will be able to open my start menu faster using an abacus.

Any word on impact on zen4?

Mitigations=off is aging like fine wine.