AVX-512 downclocking post

By: Montaray Jack (none.delete@this.none.org), January 19, 2020 2:10 am
Room: Moderated Discussions
Andrei (andrei.delete@this.anandtech.com) on January 17, 2020 10:40 pm wrote:
> Montaray Jack (none.delete@this.none.org) on January 17, 2020 2:58 pm wrote:
> > Andrei (andrei.delete@this.anandtech.com) on January 17, 2020 1:47 am wrote:
> > > anon³ (nope.delete@this.example.test) on January 17, 2020 12:25 am wrote:
> > > > Travis Downs (travis.downs.delete@this.gmail.com) on January 16, 2020 8:20 pm wrote:
> > > > > Here's a draft of a blog entry I'll post fully tomorrow:
> > > > >
> > > > > https://travisdowns.github.io/blog/2020/01/08/avxfreq.html
> > > > >
> > > > > Feedback, including frank feedback about things that are confusing or pointless, free
> > > > > proofreading, whatever is welcome. Reply here or by email or whatever you want.
> > > > >
> > > > > Please don't repost this anywhere other than RWT for the moment, that's for tomorrow.
> > > > >
> > > > > Ignore TODOs, I'll fix them tomorrow.
> > > >
> > > > Impressive! (And I don't say that lightly.)
> > > >
> > > > There are a couple of typos:
> > > >
> > > > > We’ve got something to sink our teeth info!
> > > >
> > > > s/info/into/
> > > >
> > > > is the first one (I think). I will confess that I got through it once but I don't think I can make it
> > > > through twice in one night to dig up where the others were :) It's dense but interesting reading, at least
> > > > for the type of person who's been lurking around these parts for ages. Thanks for writing it up.
> > > >
> > > > Though I will say that the endnotes bother me. I much prefer the style where hovering/tapping the reference
> > > > number shows a popup with the text. It's akin to footnotes
> > > > vs endnotes in printed material. But changing that
> > > > would require messing with web tech, and I'd rather stick to my (hardware) day job, thank-you-very-much.
> > > >
> > > >
> > > > Back on topic: anyone know what happened to AMD's adaptive clocking (as used in Steamroller and described
> > > > on the front page here)? I have seen no marketing material
> > > > implying that it's in Zen/+/2, but I also haven't
> > > > seen any analysis at this level of detail or finer for Zen. It seems like that scheme or a refined version
> > > > would be a much more effective solution than Intel's brutish
> > > > mess. A single heavy instruction burning 75,000
> > > > cycles (at 3GHz, 10us halted plus 10us gated down to 1/4 rate) seems... suboptimal.
> > > >
> > > > I'm also a bit surprised at how long the Intel FIVR takes to slew (according to the numbers in
> > > > the other thread plus your measured results). Sure, it's regulating truly massive currents going
> > > > into gigantic capacitances (at least for the time scales involved), but my intuition would have
> > > > been that a >100MHz controller could have done a bit better. But probably that's just me being
> > > > thrown off by recently designing with CFB amplifiers that slew at over 1000V/us....
> > >
> > > Adaptive clocking is active and working on Zen.
> >
> > As long as you aren't using linux on a zen laptop.
>
> What? It's hardware feature, what does Linux have to do with
> it? Unless it's enabled/disabled at boot for some reason.

Just the usual ACPI only really works on Microsoft BS.
< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
AVX-512 downclocking postTravis Downs2020/01/16 09:20 PM
  AVX-512 downclocking postanon³2020/01/17 01:25 AM
    AVX-512 downclocking postAndrei2020/01/17 02:47 AM
      AVX-512 downclocking postMontaray Jack2020/01/17 03:58 PM
        AVX-512 downclocking postAndrei2020/01/17 11:40 PM
          AVX-512 downclocking postMontaray Jack2020/01/19 02:10 AM
            AVX-512 downclocking postJan Olšan2020/01/19 01:01 PM
              AVX-512 downclocking postJan Olšan2020/01/19 01:11 PM
    AVX-512 downclocking postTravis Downs2020/01/17 02:59 PM
    AVX-512 downclocking postDavid Kanter2020/01/18 10:27 AM
      magnetic inductorsjokerman2020/01/18 08:03 PM
      AVX-512 downclocking postTravis Downs2020/01/24 11:36 AM
  AVX-512 downclocking postRay2020/01/17 02:22 AM
    AVX-512 downclocking postTravis Downs2020/01/17 01:10 PM
  AVX-512 downclocking postEtienne2020/01/17 03:16 AM
    Thanks, typos fixed and credited (NT)Travis Downs2020/01/17 01:15 PM
  Title suggestions welcome (NT)Travis Downs2020/01/17 08:54 AM
  AVX-512 downclocking postanonymou52020/01/17 10:53 AM
    AVX-512 downclocking postTravis Downs2020/01/17 11:14 AM
      AVX-512 downclocking postYoav2020/01/17 11:50 AM
        AVX-512 downclocking postTravis Downs2020/01/17 01:14 PM
      AVX-512 downclocking postanonymou52020/01/17 04:26 PM
        AVX-512 downclocking postTravis Downs2020/01/22 08:19 PM
          AVX-512 downclocking postanonymou52020/01/23 12:56 AM
            AVX-512 downclocking postFoyle2020/01/23 05:51 AM
              AVX-512 downclocking postanonymou52020/01/23 06:57 AM
                AVX-512 downclocking postTravis Downs2020/01/24 12:49 PM
            finer-grained licensesTravis Downs2020/01/24 01:03 PM
              finer-grained licensesanonymou52020/01/24 04:28 PM
                finer-grained licensesTravis Downs2020/01/25 09:46 AM
  post published (new line)Travis Downs2020/01/17 11:55 AM
    should say: (new LINK) (NT)Travis Downs2020/01/17 11:55 AM
      should say: (new LINK)Tim McCaffrey2020/01/17 01:44 PM
        Thanks, fixed and credited (NT)Travis Downs2020/01/17 02:54 PM
      should say: (new LINK)anon2020/01/17 09:12 PM
        should say: (new LINK)Travis Downs2020/01/22 03:28 PM
          Thanks!anon2020/01/22 08:06 PM
            Thanks!Travis Downs2020/01/22 08:16 PM
              Thanks!anon2020/01/22 10:20 PM
                Thanks!Travis Downs2020/01/23 01:51 AM
                  Thanks!Linus Torvalds2020/01/23 05:33 PM
                    Thanks!Travis Downs2020/01/24 12:44 PM
  Throttling dispatchGabriele Svelto2020/01/22 01:40 PM
    Itanium also used itDavid Kanter2020/01/22 02:04 PM
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