Cloudflare CPU has better perf/W

By: David Kanter (dkanter.delete@this.realworldtech.com), October 15, 2018 10:09 am
Room: Moderated Discussions
anon (spam.delete.delete@this.this.spam.com) on October 15, 2018 9:10 am wrote:
> David Kanter (dkanter.delete@this.realworldtech.com) on October 15, 2018 8:39 am wrote:
> >
> > > Well, exactly! "Co-innovating" a custom CPU "specifically made for our workload offering considerable value
> > > in Performance per Watt" as their blog post says on one hand and a throwaway bin whose perf/W is worse than
> > > everything Intel offers on the other, which is evident from figures, are clearly not the same thing.
> >
> > The custom SKU mentioned by cloudflare actually has better perf/w than their prior generation. You should
> > redo your math, it's about 5% better and also boosts system perf/w with more cores per system.
> >
> > David
>
> Prior generation as in Broadwell or the Xeon Silver?

Their comparison was of G8 vs. G9. And you have to consider the whole server, not just the CPU. Doubling the CPUs/server is quite valuable.

> It's slightly better than the Xeon Silver but 2.5% doesn't look like "considerable value in
> Performance per Watt" to me. At least it's nowhere near the ~100% Centriq would get them.

> They claim RPS scale with the number of cores, completely ignoring the clockrate and I have a hard time believing
> that. They're not that memory bound that a 10% change in clockrate doesn't affect performance at all.

They definitely aren't memory bound...they are only using 4 channels of memory.

> And the math checks out, naively going by rated clockrates and
> TDP that custom SKU is less efficient than any 24 core list SKU.

There is only one 24C - the Xeon 8160. So yes, they are basically buying a slower/less efficient version of the 8160...but probably for a lot less money.

David
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TopicPosted ByDate
Cloudflare jumps to custom Intelnobody in particular2018/10/10 07:55 AM
  Cloudflare jumps to custom Intelnone2018/10/10 08:25 AM
  Cloudflare jumps to custom Intelanon2018/10/10 08:39 AM
  Cloudflare jumps to custom IntelMaynard Handley2018/10/10 09:26 AM
    Cloudflare jumps to custom Intelnobody in particular2018/10/10 12:03 PM
      Cloudflare jumps to custom IntelWilco2018/10/10 12:25 PM
        Cloudflare jumps to custom Intelanon2018/10/10 01:07 PM
          Cloudflare jumps to custom Intelhobold2018/10/10 01:14 PM
          Cloudflare jumps to custom IntelWilco2018/10/10 01:58 PM
            Cloudflare jumps to custom Intelanon2018/10/10 07:56 PM
              Cloudflare jumps to custom IntelWilco2018/10/11 01:18 AM
                Cloudflare jumps to custom IntelMichael S2018/10/11 02:43 AM
                Cloudflare jumps to custom Intelanon2018/10/11 02:30 PM
          Cloudflare jumps to custom IntelBeastian2018/10/10 04:33 PM
            Cloudflare jumps to custom IntelDoug S2018/10/11 01:38 AM
          Qualcomm restructured server chip unitjuanrga2018/10/11 02:04 AM
            Qualcomm restructured server chip unitnone2018/10/11 03:38 AM
              Qualcomm restructured server chip unitMichael S2018/10/11 06:48 AM
                Qualcomm restructured server chip unitnone2018/10/11 08:15 AM
      Cloudflare jumps to custom Intelanon2018/10/10 12:29 PM
  Cloudflare jumps to custom IntelDoug S2018/10/10 11:10 AM
    Cloudflare jumps to custom Inteldmcq2018/10/10 11:27 AM
    Cloudflare jumps to custom Intelanon2018/10/10 02:07 PM
      Cloudflare jumps to custom IntelMichael S2018/10/11 03:06 AM
        Cloudflare jumps to custom Intelanon2018/10/11 06:02 AM
          Why can't two "computers" be on one board?Paul A. Clayton2018/10/11 06:49 PM
            Why can't two "computers" be on one board?rwessel2018/10/12 12:01 AM
              TwinBladesPaul A. Clayton2018/10/12 04:52 AM
            Why can't two "computers" be on one board?Doug S2018/10/12 01:01 AM
              Why can't two "computers" be on one board?Etienne2018/10/12 02:04 AM
              [O.T.] bladesMichael S2018/10/12 02:17 AM
                [O.T.] bladesAdrian2018/10/12 04:17 AM
              Why can't two "computers" be on one board?anon2018/10/12 03:04 AM
                Why can't two "computers" be on one board?rwessel2018/10/12 07:29 AM
                  Why can't two "computers" be on one board?anon2018/10/12 07:55 AM
              1S vs 2SWes Felter2018/10/12 01:30 PM
                1S vs 2SDoug S2018/10/12 02:35 PM
            Why can't two "computers" be on one board?anon2018/10/12 03:10 AM
            Why can't two "computers" be on one board?hobel2018/10/12 06:53 AM
      Cloudflare jumps to custom Intelanon.12018/10/11 09:16 AM
  Weird numbersjuanrga2018/10/11 02:11 AM
    Weird numbersanon2018/10/11 06:08 AM
      Weird numbersjuanrga2018/10/11 10:34 AM
        Weird numbersanon2018/10/11 11:24 AM
  Look at the figures, folksAM2018/10/11 08:15 AM
    Look at the figures, folksFoo_2018/10/11 09:22 AM
      Look at the figures, folksAM2018/10/11 10:02 AM
        Look at the figures, folksanon2018/10/11 02:49 PM
          Look at the figures, folksSimon Farnsworth2018/10/12 12:19 AM
            Some power efficiency figuresAM2018/10/12 03:59 AM
              Some power efficiency figuresSimon Farnsworth2018/10/12 09:00 AM
                Some power efficiency figuresMaynard Handley2018/10/12 09:33 AM
                  Some power efficiency figuresSimon Farnsworth2018/10/12 10:51 AM
                    Some power efficiency figuresanon2018/10/12 12:55 PM
                    Some power efficiency figuresMaynard Handley2018/10/12 02:37 PM
                      Some power efficiency figuresanon2018/10/12 03:04 PM
                        Some power efficiency figuresMaynard Handley2018/10/12 03:16 PM
                          Some power efficiency figuresanon2018/10/13 01:13 AM
                          Some power efficiency figuresanon2018/10/13 04:06 AM
                      Some power efficiency figuresSimon Farnsworth2018/10/13 03:52 AM
                        Some power efficiency figuresanon2018/10/13 04:17 AM
                Reread what you saidAM2018/10/14 08:14 AM
          Important clue for several postersAM2018/10/12 03:48 AM
            Important clue for several postersjuanrga2018/10/12 09:07 AM
              Important clue for several postersWilco2018/10/12 12:50 PM
                Thanks (NT)juanrga2018/10/13 03:17 AM
            Important clue for several postersWes Felter2018/10/12 01:42 PM
              Important clue for several postersAM2018/10/14 08:00 AM
                Cloudflare CPU has better perf/WDavid Kanter2018/10/15 07:39 AM
                  Cloudflare CPU has better perf/Wanon2018/10/15 08:10 AM
                    Cloudflare CPU has better perf/WDavid Kanter2018/10/15 10:09 AM
                      Cloudflare CPU has better perf/Wanon2018/10/15 11:52 AM
            Important clue for several postersanon2018/10/13 01:20 AM
              Important clue for several postersAM2018/10/14 07:58 AM
                Important clue for several postersanon2018/10/14 02:29 PM
                  Important clue for several postersAM2018/10/16 09:18 AM
                    Important clue for several postersanon2018/10/16 10:35 AM
                    Important clue for several postersanon2018/10/17 03:01 PM
    Look at the figures, folksDavid Kanter2018/10/13 05:08 AM
      Look at the figures, folksAM2018/10/14 07:50 AM
        Look at the figures, folksDavid Kanter2018/10/14 08:25 PM
          Look at the figures, folksMichael S2018/10/15 01:16 AM
            What?!AM2018/10/16 09:12 AM
          ARM servers in AzureMichael S2018/10/15 01:19 AM
            ARM servers in Azurejuanrga2018/10/15 04:41 AM
              ARM servers in AzureMichael S2018/10/15 04:46 AM
              ARM servers in AzureAnon2018/10/15 04:54 AM
                ARM servers in Azureanon2018/10/15 06:40 AM
          Look at the figures, folksAM2018/10/16 09:07 AM
        Look at the figures, folksMichael S2018/10/15 01:25 AM
        What figures?someone2018/10/15 04:35 AM
          What figures?AM2018/10/16 09:03 AM
            What figures?someone2018/10/17 07:19 AM
              What figures?wumpus2018/10/18 07:46 AM
      Look at the figures, folksJames2018/10/15 04:16 AM
        Look at the figures, folksAnne O. Nymous2018/10/15 04:31 AM
          Look at the figures, folksanonymou52018/10/15 04:47 AM
            Look at the figures, folksAnne O. Nymous2018/10/15 04:55 AM
        Watch the financial reportsAnon2018/10/15 05:00 AM
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