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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Travis Goodspeed‏ @travisgoodspeed Apr 2

      Travis Goodspeed Retweeted Robᵉʳᵗ Graham X🅂 Max

      Once again, @ErrataRob derails my brilliant plan to build an MSP430 workstation and server platform.https://twitter.com/ErrataRob/status/980907462973902849 …

      Travis Goodspeed added,

      Robᵉʳᵗ Graham X🅂 Max @ErrataRob
      1/ Yet again it's worth reminding people that ARM/RISC processors do not have a power efficiency advantage at the high-end. Yes, ARM processors are popular in mobile devices, but they consume less power because they are slower, not because they are more efficient.
      Show this thread
      3 replies 2 retweets 15 likes
    2. Rich Felker‏ @RichFelker Apr 2
      Replying to @travisgoodspeed @ErrataRob

      He's wrong anyway. At same (high) perf, high-end ARMs use about 1/2 the power.

      2 replies 0 retweets 3 likes
    3. Robᵉʳᵗ Graham X🅂 Max‏ @ErrataRob Apr 2
      Replying to @RichFelker @travisgoodspeed

      ARM chips that use half the power are half as fast. There are no ARM chips that run as fast as Intel's fastest chips.

      2 replies 0 retweets 1 like
    4. Rich Felker‏ @RichFelker Apr 2
      Replying to @ErrataRob @travisgoodspeed

      You can always have same perf (assuming //izable jobs) just by adding more cores. At perf parity, ARM is ~half power consumption.

      1 reply 0 retweets 0 likes
    5. Robᵉʳᵗ Graham X🅂 Max‏ @ErrataRob Apr 2
      Replying to @RichFelker @travisgoodspeed

      That's what everyone thinks. Not people who know CPUs, of course, but everyone else.

      1 reply 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker Apr 2
      Replying to @ErrataRob @travisgoodspeed

      Rich Felker Retweeted Matthew Prince

      Apparently it's what @Cloudflare thinks.https://twitter.com/eastdakota/status/976560820611031040?s=20 …

      Rich Felker added,

      Matthew PrinceVerified account @eastdakota
      Why we’re switching to ARM-based servers in one image. Both servers running the same workload at the same performance. pic.twitter.com/wMFKS0Avkt
      2 replies 0 retweets 1 like
    7. Robᵉʳᵗ Graham X🅂 Max‏ @ErrataRob Apr 2
      Replying to @RichFelker @travisgoodspeed @Cloudflare

      That's because it's a network processor that includes fixed-function accelerators for crypto and compression that would otherwise be done in software on Intel CPUs.

      3 replies 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker Apr 2
      Replying to @ErrataRob @travisgoodspeed @Cloudflare

      I've seen similar results on big compile jobs, no acceleration. Need to test myself sometime.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Apr 2
      Replying to @RichFelker @ErrataRob and

      My semi-educated guess is that you can do way better than 1/2 power consumption (maybe as low as 10%) just by using a larger array of simpler cores rather than higher-end out-of-order ARMs.

      2:31 PM - 2 Apr 2018
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker Apr 2
          Replying to @RichFelker @ErrataRob and

          Of course if Intel made simple cores they could be competitive here too, but they abandoned the Atom microarchitecture that was the closest thing they had (and likely their only hope for making chips unaffected by Spectre).

          1 reply 0 retweets 0 likes
        3. Robᵉʳᵗ Graham X🅂 Max‏ @ErrataRob Apr 2
          Replying to @RichFelker @travisgoodspeed @Cloudflare

          I want to see a server using a Xeon Phi (72 Atom cores) do a Linux compile. The massive floating point logic may make things inefficient, but it'd still be fun to try.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker Apr 2
          Replying to @ErrataRob @travisgoodspeed @Cloudflare

          Wow interesting. I had no idea Larrabee was non-OOOE. I might have to pick one up as a better Spectre-free option than the S1260 I've got now.

          1 reply 0 retweets 0 likes
        5. Robᵉʳᵗ Graham X🅂 Max‏ @ErrataRob Apr 2
          Replying to @RichFelker @travisgoodspeed @Cloudflare

          That's the old stuff. The latest (Knight's Landing) is OoO, using the newer Airmont cores that are OoO. It turns out that some OoO is still more power efficient than none at all.

          1 reply 0 retweets 0 likes
        6. Rich Felker‏ @RichFelker Apr 2
          Replying to @ErrataRob @travisgoodspeed @Cloudflare

          Right, but I specifically want non-OOOE. Thus looking at old stuff.

          1 reply 0 retweets 0 likes
        7. Rich Felker‏ @RichFelker Apr 2
          Replying to @RichFelker @ErrataRob and

          Sadly it looks like the old stuff was never produced in significant commercial quantities...

          0 replies 0 retweets 0 likes
        8. End of conversation
        1. New conversation
        2. Robᵉʳᵗ Graham X🅂 Max‏ @ErrataRob Apr 2
          Replying to @RichFelker @travisgoodspeed @Cloudflare

          Yes, for some applications (like the network processing CloudFlare does). But for most tasks, the coordination among cores quickly overcomes the benefits of many cores. That's why Sun failed with their SPARC T-1 strategy.

          2 replies 0 retweets 0 likes
        3. Robᵉʳᵗ Graham X🅂 Max‏ @ErrataRob Apr 2
          Replying to @ErrataRob @RichFelker and

          Also, Cavium has been doing this forever (MIPS, but changed to ARM recently) and they've only gotten traction in the network appliance market, despite many attempts at servers.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker Apr 2
          Replying to @ErrataRob @travisgoodspeed @Cloudflare

          Well MIPS was a huge incoherent mess of incompatible ABIs, wrong ABIs (32-bit time_t on n32), secretly-incompatible ISA variants (mipsr6), ... with no hope of gaining traction as a platform.

          0 replies 0 retweets 1 like
        5. End of conversation

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