Interesting Zen IPC benchmarks

By: Andrei F (andrei.delete@this.anandtech.com), November 24, 2020 5:47 am
Room: Moderated Discussions
Chester (lamchester.delete@this.gmail.com) on November 22, 2020 8:33 pm wrote:
> Andrei F (andrei.delete@this.anandtech.com) on November 22, 2020 4:08 am wrote:
> > Chester (lamchester.delete@this.gmail.com) on November 21, 2020 2:49 pm wrote:
> > > Some interesting things:
> > > - Zen 3 beats Intel on full random mem access latency despite using
> > > a separate IO die. Maybe 6 page walkers are playing a role.
> >
> > Page walkers have nothing to do with it, you can't page-walk ahead of an actual proper
> > working pointer-chase pattern. The Sandra test is just broken and showing nonsense.
> >
> > https://www.anandtech.com/show/16214/amd-zen-3-ryzen-deep-dive-review-5950x-5900x-5800x-and-5700x-tested/5
> >
> > The real data shows that there's essentially no change between Zen2 and Zen3 in cycles,
> > which is expected given it's the exact same IOD, and Intel is still ahead in latency.
>
> How does AT's methodology differ from Sandra's, and why is Sandra's latency lower?
> I'm not saying AT's wrong (you're probably right, - I highly doubt latency changed
> like that with the same IOD). I'm just curious what's actually being measured.


Sandra's test is simply not a true full random test, but something else. Hell they don't even disclose the test depth so who knows what it does.

My test is a plain simple stupid n = n->next chain across cache lines on a given memory depth.

>
> > > Try scrolling down a bit. The little bar on the right of your browser window can do that - try dragging
> > > it down or pushing the down arrow at the bottom, and you'll see a whole lot more than rendering.
> > >
> > > There's compression, gaming, video editing, image editing, as well as a couple
> > > of synthetics. Not the most complete coverage, but miles better than SPEC.
> >
> > Yea, if you mean miles better means 1/4th coverage of the subtests.
>
> Since most/all of the subtests are irrelevant and meaningless for consumers, yeah I consider it
> miles better. There's a reason SPEC isn't popular among review sites. No one cares about it.

Other review sites don't use it because first of all they don't have a license, second of all they wouldn't even know what to do with it. I doubt anybody else is going into the source to figure out to port things across operating systems and mobile devices on new architectures.

There's actually Chinese publications using it, amongst also another big German print publication (C't), though I haven't seen them properly use it in some time.
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TopicPosted ByDate
Interesting Zen IPC benchmarksAdrian2020/11/21 08:14 AM
  Interesting Zen IPC benchmarksjuanrga2020/11/21 10:22 AM
    Interesting Zen IPC benchmarksChester2020/11/21 03:49 PM
      Interesting Zen IPC benchmarksAndrei F2020/11/22 05:08 AM
        Interesting Zen IPC benchmarksChester2020/11/22 09:33 PM
          Interesting Zen IPC benchmarksnone2020/11/23 01:59 AM
            Interesting Zen IPC benchmarksnone2020/11/23 02:01 AM
              Interesting Zen IPC benchmarksnone2020/11/23 02:01 AM
          No...David Kanter2020/11/23 08:16 AM
            No...Chester2020/11/23 03:15 PM
              No...Foo_2020/11/24 03:34 AM
                No...Chester2020/11/25 12:45 AM
                  No...Per Hesselgren2020/11/25 01:57 AM
                  No...Adrian2020/11/25 04:21 AM
          Interesting Zen IPC benchmarksDoug S2020/11/23 01:03 PM
            Interesting Zen IPC benchmarksChester2020/11/23 03:26 PM
              Programs people useFoo_2020/11/24 03:43 AM
                Programs people useJukka Larja2020/11/24 07:07 AM
                Cinebench is the new Dhrystone :) (NT)none2020/11/25 01:10 AM
              Interesting Zen IPC benchmarksjuanrga2020/11/24 08:38 AM
          Interesting Zen IPC benchmarksAndrei F2020/11/24 05:47 AM
            Interesting Zen IPC benchmarksChester2020/11/25 12:32 AM
              Questionable thoughtsbenchmark critic2020/11/25 08:41 AM
                Questionable thoughtsChester2020/11/25 03:14 PM
                Questionable thoughtsnone2020/11/26 01:14 AM
                  Links?benchmark critic2020/11/26 09:48 AM
              Interesting Zen IPC benchmarksGroo2020/11/25 01:48 PM
                Interesting Zen IPC benchmarksChester2020/11/25 04:36 PM
                  Interesting Zen IPC benchmarksGroo2020/11/26 02:46 PM
                    Interesting Zen IPC benchmarksChester2020/11/26 07:32 PM
                      Interesting Zen IPC benchmarksGroo2020/11/27 10:27 AM
                        Interesting Zen IPC benchmarksChester2020/11/29 07:16 AM
                          Interesting Zen IPC benchmarksGroo2020/11/29 09:56 AM
                            Interesting Zen IPC benchmarksChester2020/11/29 04:41 PM
                Interesting Zen IPC benchmarksRayla2020/11/26 07:46 AM
                  BenchmarksDavid Kanter2020/11/26 10:05 AM
                    Benchmarksblaine2020/11/26 01:04 PM
          Interesting Zen IPC benchmarksPer Hesselgren2020/11/24 10:11 AM
            Interesting Zen IPC benchmarksChester2020/11/25 12:42 AM
      Interesting Zen IPC benchmarksjuanrga2020/11/22 07:09 AM
        Interesting Zen IPC benchmarksChester2020/11/22 09:53 PM
          Interesting Zen IPC benchmarksjuanrga2020/11/23 01:16 PM
            Interesting Zen IPC benchmarksChester2020/11/23 02:27 PM
              Interesting Zen IPC benchmarksjuanrga2020/11/24 08:25 AM
            Interesting Zen IPC benchmarksAdrian2020/11/24 11:51 AM
              Interesting Zen IPC benchmarksjuanrga2020/11/26 04:52 AM
  The Stilt's Zen 3 IPC benchmarksDummond D. Slow2020/11/25 09:29 AM
    The Stilt's Zen 3 IPC benchmarksChester2020/11/25 04:49 PM
      The Stilt's Zen 3 IPC benchmarksDummond D. Slow2020/11/25 05:58 PM
        The Stilt's Zen 3 IPC benchmarksDoug S2020/11/26 09:19 AM
      The Stilt's Zen 3 IPC benchmarksDummond D. Slow2020/11/25 06:13 PM
        The Stilt's Zen 3 IPC benchmarksChester2020/11/26 11:24 AM
          The Stilt's Zen 3 IPC benchmarksitsmydamnation2020/11/26 03:06 PM
            The Stilt's Zen 3 IPC benchmarksChester2020/11/26 07:10 PM
            The Stilt's Zen 3 IPC benchmarksDoug S2020/11/27 04:17 PM
      The Stilt's Zen 3 IPC benchmarksjuanrga2020/11/26 05:10 AM
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