Re:Intel Announces 9th Gen Core CPUs
by gamedevs_cancer on Monday October 08, 2018 @01:54PM
(#18169666)
Most synthetic benchmarks have proven amd's SMT scales far better than hyperthreading. It might be the paper's domain that's more suited for HT. Moreover, they appear to be using AVX instructions, which are arguably faster, but don't provide an accurate picture on hyperthreading performance
Yeah, take a look at this: https://www.anandtech.com/show/11544/intel-skylake-ep-vs-amd...
> On average, both Xeons pick up about 20% due to SMT (Hyperthreading). The EPYC 7601 improved by even more: it gets a 28% boost on average.
These results are the same as I've seen everywhere except the quote you pulled out. Zen's SMT is more effective than Intel's HT.
Re:Intel Announces 9th Gen Core CPUs
by iforgotpassword on Monday October 08, 2018 @02:09PM
(#18169804)
As we now know, this is because Intel cheats. That's why Intel's smt is vulnerable to whatever that recent spectre/meltdown variant was called and AMDs is not.
From https://www.cs.cmu.edu/~pavlo/papers/p2209-kersten.pdf
"The only significant difference between the two platforms is that, although both platforms offer 2-way Simultaneous Multi-Threading (SMT), Intel’s hyper-threading implementation seems to be much better. On the Skylake, we see a performance boost from hyper- threading for all queries. On the AMD system, the benefit of SMT is either very small, and for some queries the use of hyper-threads results in a performance degradation."