from the TANSTAAFL dept.
Intel has published its own set of benchmark results for the mitigations to the latest round of vulnerabilities, but Phoronix, a publication that focuses on Linux-related news and reviews, has conducted its own testing and found a significant impact. Phoronix's recent testing of all mitigations in Linux found the fixes reduce Intel's performance by 16% (on average) with Hyper-Threading enabled, while AMD only suffers a 3% average loss. Phoronix derived these percentages from the geometric mean of test results from its entire test suite.
From a performance perspective, the overhead of the mitigations narrow the gap between Intel and AMD's processors. Intel's chips can suffer even more with Hyper-Threading (HT) disabled, a measure that some companies (such as Apple and Google) say is the only way to make Intel processors completely safe from the latest vulnerabilities. In some of Phoronix's testing, disabling HT reduced performance almost 50%. The difference was not that great in many cases, but the gap did widen in almost every test by at least a few points.
To be clear, this is not just testing with mitigations for MDS (also known as Fallout, Zombieload, and RIDL), but also patches for previous exploits like Spectre and Meltdown. Because of this, AMD also has lost some performance with mitigations enabled (because AMD is vulnerable to some Spectre variants), but only 3%.
Have you disabled hyperthreading?
A recent post on Intel's employee-only portal titled, "AMD competitive profile: Where we go toe-to-toe, why they are resurgent, which chips of ours beat theirs," has found its way to Reddit and offers a fascinating glimpse into how Intel perceives one of its largest competitors and the challenges it is posing to some of its divisions.
[...] Penned by Walden Kirsch as part of "the latest in a Circuit News series on Intel's major competitors," the piece notes how AMD was the best-performing stock on the S&P 500 last year and enjoyed its second straight year of greater than 20 percent annual revenue growth in 2018. One of the reasons for AMD's resurgence, Kirsch surmises, is its strategic re-focus on high-performance products in the desktop, datacenter and server markets.
Specifically, Kirsch highlighted AMD's use of TSMC's 7nm manufacturing process, victories in public cloud offerings and its next-gen Zen-core products as factors that will "amplify the near-term competitive challenge from AMD."
[...] The company believes its 9th Gen Core processors will beat AMD's Ryzen-based products in lightly threaded productivity benchmarks as well as in gaming benchmarks. With regard to multi-threaded workloads, Intel said AMD's Matisse "is expected to lead."
Soon to be discontinued internal news series.
See also: Platform Storage Face-Off: AMD Upsets Intel
AMD Ryzen 16 Core 5.2GHz CPU Benchmark Leaked, Crushes Intel's i9 9980XE
AMD Ryzen 5 3600 6 Core, 12 Thread CPU Tested on X470 Platform – Single-Core Performance On Par With The Core i9-9900K
AMD Ryzen 7 3800X Benchmarks Leaked, Crushes Intel's i9 9900K in Multi-threaded Performance
Related: Intel's Processors Lose More Performance From Vulnerability Mitigations Than AMD's
AMD and Intel at Computex 2019: First Ryzen 3000-Series CPUs and Navi GPU Announced
HP Boss: Intel Shortages are Steering Our Suited Customers to Buy AMD
AMD Details Three Navi GPUs and First Mainstream 16-Core CPU