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posted by Fnord666 on Monday May 20 2019, @04:28AM   Printer-friendly
from the TANSTAAFL dept.

Intel Loses 5X More Average Performance Than AMD From Mitigations: Report

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?

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  • (Score: 3, Insightful) by HiThere on Monday May 20 2019, @04:33PM (2 children)

    by HiThere (866) Subscriber Badge on Monday May 20 2019, @04:33PM (#845551) Journal

    Unless you've got a good reason for overclocking, that's usually an unwise move. It increases the error rate and shortens the lifetime of the electronics. It's much better to get a system that doesn't NEED to be overclocked to do what you need.

    That said, it's a good string to have for your bow for when you need it. It's just that use it too often and you'll break the bow. (Being unlocked has other good features, however.)

    Javascript is what you use to allow unknown third parties to run software you have no idea about on your computer.
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  • (Score: 2) by Spamalope on Tuesday May 21 2019, @12:36AM

    by Spamalope (5233) on Tuesday May 21 2019, @12:36AM (#845679) Homepage

    If you're worried about reliability, and you're looking for extra value in the middle/low tier vs besting the top of the line parts you can get some gains easily.
    Find a core that's being binned to product segment and is also getting good yields. Overclock by forcing the same settings the top binned part has. Many to most of the parts will work fine, they just haven't been tested or warrantied for that speed and you know it's not beyond the specs AMD/Intel thinks is ok for the chip - then you can try undervolting if that goes well and you want to tune some...

  • (Score: 4, Insightful) by takyon on Tuesday May 21 2019, @12:56PM

    by takyon (881) <> on Tuesday May 21 2019, @12:56PM (#845785) Journal

    $90 Ryzen 3 is practically disposable. A Zen 2 chip could be dropped in without replacing the motherboard, although a separate GPU might be needed.

    Today's overclocking is likely to rely on tools given by the company and the CPU contains sensors that automatically adjust frequencies to match the cooling situation, and/or prevent manual overclocking from doing serious damage.

    Looks like Subsentient has the Ryzen 3 2200G. Overclocking +400 MHz from the base clock is trivial. []

    Subsentient can wait a few years, pick up another AM4 socket CPU on sale (Zen 2, maybe Zen 3 if that is also AM4), and get more cores and better performance even before overclocking.

    [SIG] 10/28/2017: Soylent Upgrade v14 []