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I came across this article the other day for the first time and started to read it. How much still applies to today?
by tayo42 10y ago
I came across this article the other day for the first time and started to read it. How much still applies to today?
- a3n 10y agoThings haven't changed much since the other day, so probably all of it.
- cornstalks 10y agoGP probably didn't mean "9 years ago" (the article was published over 9 years ago) when saying "the other day." 9 years is a long time in the tech world. It's a valid question.
- honkhonkpants 10y agoWhy do you say so? AMD k8 came out 14 years ago and PC architecture is basically unchanged since.
- alcari 10y agoFrom a quick look through, most of it. Modern x86 micro-architectures still use integrated memory controllers and ~3 level CPU caches. All the timings are a little faster, the caches a little bigger, and the buses a little wider, but it's still basically the same stuff with different names.
- Const-me 10y agoPart 1: 50% applies, RAM controllers now part of the CPU, deprecating half of what’s written, also some CPUs have eDRAM. Part 2: almost completely applies. Part 3: 70% applies, hardware SLAT (Intel EPT / AMD RVI) deprecated what’s written about virtualization. Part 5: 90% applies. The rest of them — don’t know. P.S. What’s I dislike most about the article, it fails to explain why L3 cache is 10-20 times slower than L1 cache, while they both made from SRAM.
- nateberkopec 10y ago> it fails to explain why L3 cache is 10-20 times slower than L1 cache, while they both made from SRAM. Why is it? Is it because L3 is usually shared?
- Const-me 10y agoEven when the cache line is unshared, L3 is still 10 times slower than L1. The best explanation I saw is this: https://fgiesen.wordpress.com/2016/08/07/why-do-cpus-have-multiple-cache-levels/ https://fgiesen.wordpress.com/2016/08/07/why-do-cpus-have-mu...
- bogomipz 10y agoI think generally the larger the cache the higher the latency. I think various factor are things like available power budget, some increase in signal propagation delay and more complicated logic needed in a larger search space.
- Alphasite_ 10y agoWithout having read the article I assume it is something to do with the asseociscativity and size of it?
- bogomipz 10y agoI think its less important to know the exact numbers since those are a moving target but its more important to understand the orders of magnitude in difference from fastest to slowest and in between.