Superiority

By: Travis Downs (travis.downs.delete@this.gmail.com), September 18, 2020 6:21 am
Room: Moderated Discussions
Andrei F (andrei.delete@this.anandtech.com) on September 18, 2020 6:17 am wrote:
> Robert Müller (Muelle.delete@this.mueller.com) on September 18, 2020 5:45 am wrote:
> > Andrei F (andrei.delete@this.anandtech.com) on September 18, 2020 4:47 am wrote:
> > > Robert Müller (Mueller.delete@this.mueller.com) on September 18, 2020 3:59 am wrote:
> > > > Andrei F (andrei.delete@this.anandtech.com) on September 18, 2020 3:39 am wrote:
> > > > > Michael S (already5chosen.delete@this.yahoo.com) on September 18, 2020 2:58 am wrote:
> > > > > > anon (anon.delete@this.anon.com) on September 17, 2020 7:10 pm wrote:
> > > > > > > AnandTech's (SPEC ST performance) review is here: anandtech.com/show/16084/intel-tiger-lake-review-deep-dive-core-11th-gen/8
> > > > > > >
> > > > > > > All of TigerLake's extra performance over IceLake is due to higher clocks. And it significantly
> > > > > > > outperforms the Zen 2 based AMD Renoir chip (Ryzen 7 4800U). However not all is good: TigerLake
> > > > > > > experiences a noticeable IPC regression compared to IceLake. The memory subsystem is unable
> > > > > > > to keep up with the higher clocks, and the reworked cache is not enough.
> > > > > > >
> > > > > > > And it just barely beats Apple's A13 despite using significantly more power.
> > > > > > > Makes you think the A14 based Mac coming later this year will blow past Intel's
> > > > > > > best CPU microarchitecture in single threaded integer performance.
> > > > > > >
> > > > > > > https://images.anandtech.com/graphs/graph16084/111168.png
> > > > > >
> > > > > > The picture reminds me of 1951's Arthur C. Clarke classic short story "Superiority".
> > > > > >
The ultimate cause of our failure was a simple one: despite all statements to the contrary, it was not
> > > > > > due to lack of bravery on the part of our men, or to any fault of the Fleet's. We were defeated by one
> > > > > > thing only - by the inferior science of our enemies. I repeat - by the inferior science of our
> > > > > > enemies.

> > > > > >
> > > > > > I mean, minimally tweaked 5 y.o. uArch manufactured on maximally
> > > > > > tweaked 6 y.o. process reigns on top of the chart.
> > > > >
> > > > > The difference that you can't see in that chart between the top 3 positions is that
> > > > > it's 40W vs 21W vs 4W. The apparent superiority will come crumbling down soon enough.
> > > >
> > > > Andrei, do you have power draw estimates for the CPUs while running these workloads? I am still not
> > > > 100% clear on the figures. If I understand your article correctly, Tiger Lake draws 50 watts at 4.8
> > > > GHz. Does this mean that the 28W TDP profile actually means 50W power consumption? What confuses me
> > > > even further is that a Coffee Lake (single core) running at 4.6 GHz only seems to consume around 30watts,
> > > > I find it hard to believe that Tiger Lake would be a regression in energy efficiency.
> > > >
> > >
> > > Those are the figures, TGL single-core power is around 20-21W-ish at 4.8G.
> > >
> > > The 50W figure is multi-core for a limited period of time before it throttles down to TDP levels at 15/28W
> > > sustained (with subsequently lower clocks). Comet Lake (10900K)
> > > is 40W-ish single-core at 5.3GHz. Essentially
> > > the new 10nm parts and new architecture is about double the efficiency of the 14nm Skylake parts.
> >
> > Thank you, now I understand! Just for my curiosity, what were the average clocks you observed while running
> > the single-threaded tests using the 15W profile? I assume somewhere around 4.5ghz based on your results?
> >
>
> We didn't track frequencies at 15W, these CPUs don't have any proper time-in-state
> driver interfaces and the test suite is automated. It'll depend on the workload
> essentially. At 28W it essentially sticks to 4.8GHz though.

For the average frequency across the test you can read the APERF MSR before and after (as you should if you want to calculate IPC rather than using the on-the-box value as the denominator).
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TopicPosted ByDate
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                    Tiger Lake performance profileAndrei Frumusanu2020/09/19 10:52 AM
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          Tiger Lake performance profile-.-2020/09/19 03:31 PM
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            Tiger Lake performance profileJose2020/09/23 12:27 AM
    Tiger Lake performance profilejuanrga2020/09/18 01:38 AM
      Tiger Lake performance profileDoug S2020/09/18 08:25 AM
  Tiger Lake performance profileAndrei F2020/09/18 12:04 AM
    Tiger Lake performance profileAnon2020/09/18 02:25 AM
      Tiger Lake performance profileAndrei F2020/09/18 02:31 AM
    Tiger Lake performance profileTravis Downs2020/09/19 07:26 PM
      Tiger Lake performance profileMichael S2020/09/20 09:02 AM
        Tiger Lake performance profileTravis Downs2020/09/20 04:34 PM
          Tiger Lake performance profileMichael S2020/09/21 12:38 AM
            Tiger Lake performance profileAndrei F2020/09/21 05:50 AM
              MKPI ? MPKI ? HPKI ? (NT)Michael S2020/09/21 06:03 AM
                MKPI ? MPKI ? HPKI ?Anon2020/09/21 06:22 AM
                  thank you (NT)Michael S2020/09/21 06:42 AM
                  MKPI ? MPKI ? HPKI ?none2020/09/22 12:12 AM
              SPEC Memory traffic & bandwidthAndrei F2020/09/21 07:35 AM
                SPEC Memory traffic & bandwidthAndrei F2020/09/21 07:36 AM
                  SPEC Memory traffic & bandwidthDavid Kanter2020/09/21 01:31 PM
                What is the meaning of multiple rows in few subtests? (NT)Michael S2020/09/21 07:45 AM
                  What is the meaning of multiple rows in few subtests?Andrei F2020/09/21 07:57 AM
            Poor L1D load bandwidthEric Bron2020/09/21 05:56 AM
              erratumEric Bron2020/09/21 05:59 AM
              Sorry I missread the graphEric Bron2020/09/21 06:14 AM
              Poor main memory load bandwidthMichael S2020/09/21 06:19 AM
            Tiger Lake performance profileTravis Downs2020/09/21 02:51 PM
              Tiger Lake performance profileAndrei F2020/09/22 06:03 AM
    Tiger Lake security fixes possible cause?Kevin G2020/09/22 05:10 AM
      Tiger Lake security fixes possible cause?Travis Downs2020/09/22 06:26 AM
  SuperiorityMichael S2020/09/18 01:58 AM
    SuperiorityAndrei F2020/09/18 02:39 AM
      SuperiorityRobert Müller2020/09/18 02:59 AM
        SuperiorityAndrei F2020/09/18 03:47 AM
          SuperiorityRobert Müller2020/09/18 04:45 AM
            SuperiorityAndrei F2020/09/18 05:17 AM
              SuperiorityTravis Downs2020/09/18 06:21 AM
          Superiorityanon2020/09/18 11:34 AM
      SuperiorityMichael S2020/09/18 05:06 AM
        SuperiorityFoo_2020/09/18 05:17 AM
          SuperiorityMichael S2020/09/18 06:08 AM
      SuperiorityDavid Hess2020/09/18 11:55 AM
    SuperiorityAdrian2020/09/18 04:56 AM
      SuperiorityMichael S2020/09/18 06:51 AM
        SuperiorityAdrian2020/09/18 08:35 AM
          SuperioritythePirate2020/09/19 01:28 AM
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