Skylake CPU can eliminate some zero-on-zero writes

By: Travis Downs (travis.downs.delete@this.gmail.com), May 13, 2020 3:09 pm
Room: Moderated Discussions
Kind of a weird finding:

https://travisdowns.github.io/blog/2020/05/13/intel-zero-opt.html

Skylake client CPUs can eliminate some writes where the whole cache before and after the writes is zero. I don't find an effect for earlier CPUs, nor for Skylake-SP/X.
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TopicPosted ByDate
Skylake CPU can eliminate some zero-on-zero writesTravis Downs2020/05/13 03:09 PM
  Skylake CPU can eliminate some zero-on-zero writesLinus Torvalds2020/05/13 04:56 PM
    Skylake CPU can eliminate some zero-on-zero writesTravis Downs2020/05/13 05:16 PM
      Skylake CPU can eliminate some zero-on-zero writesNiels Jørgen Kruse2020/05/13 09:43 PM
        Skylake CPU can eliminate some zero-on-zero writesTravis Downs2020/05/14 09:02 AM
        general cache-line compressionBeastian2020/05/15 08:37 AM
      Skylake CPU can eliminate some zero-on-zero writesLinus Torvalds2020/05/14 12:54 PM
        Skylake CPU can eliminate some zero-on-zero writesLinus Torvalds2020/05/14 01:15 PM
          Skylake CPU can eliminate some zero-on-zero writesTravis Downs2020/05/18 04:55 PM
            Skylake CPU can eliminate some zero-on-zero writesLinus Torvalds2020/05/18 06:15 PM
              Skylake CPU can eliminate some zero-on-zero writesBjörn Ragnar Björnsson2020/05/19 10:07 PM
                Skylake CPU can eliminate some zero-on-zero writesJörn Engel2020/05/20 01:21 AM
                  Skylake CPU can eliminate some zero-on-zero writesLinus Torvalds2020/05/20 12:18 PM
                    Skylake CPU can eliminate some zero-on-zero writesJörn Engel2020/05/24 11:25 AM
                  Skylake CPU can eliminate some zero-on-zero writesBjörn Ragnar Björnsson2020/05/20 02:53 PM
                    Skylake CPU can eliminate some zero-on-zero writesJörn Engel2020/05/20 08:10 PM
  A new kind of timing attack?Foo_2020/05/14 02:20 AM
    Timing attacks rarely matterDoug S2020/05/14 02:12 PM
      Timing attacks rarely matterFoo_2020/05/14 03:56 PM
        Timing attacks rarely matterDoug S2020/05/15 11:03 AM
      Timing attacks rarely matterDavid Hess2020/05/25 01:46 AM
        Timing attacks rarely matterDoug S2020/05/25 09:32 AM
    A new kind of timing attack? (Update)Travis Downs2021/06/26 05:08 PM
      A new kind of timing attack? (Update)Ian Ameline2021/06/27 05:52 AM
        A new kind of timing attack? (Update)Travis Downs2021/06/28 11:52 AM
  Skylake CPU can eliminate some zero-on-zero writesTravis Downs2020/05/18 04:56 PM
    Ice Lake results above (NT)Travis Downs2020/05/18 04:56 PM
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