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Intel i9-12900K Alder Lake Linux Performance In Different P/E Core Configurations

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  • #71
    Originally posted by birdie View Post

    The setting, Ignore List, is at the bottom of the page: https://www.phoronix.com/forums/settings/account
    I tried setting that before for someone, and unfortunately it didn't work. I'm wondering if it might just be for private messages or something.

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    • #72
      Originally posted by Markopolo View Post
      The article clearly shows the best perf and best perf/watt was achieved ...
      No, look again. The benchmarks show the opposite. Several of these show clearly that one gains performance by disabling the 8 E cores.

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      • #73
        Originally posted by smitty3268 View Post

        I tried setting that before for someone, and unfortunately it didn't work. I'm wondering if it might just be for private messages or something.
        This is a known issue with vBulletin - for some users it works, for others it doesn't. I've asked Michael to migrate to something a little bit better maintained, e.g. XenForo, but he declined.

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        • #74
          Originally posted by sdack View Post
          No, look again. The benchmarks show the opposite. Several of these show clearly that one gains performance by disabling the 8 E cores.
          The Linux kernel doesn't understand the ADL CPUs topology. Even the newly released Windows 11 which was supposed to support ADL perfectly struggles with some applications and Windows 10, despite not knowing or understanding ADL CPUs, sometimes works better:

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          • #75
            At the end of the day, Alder Lake is a new platform and you're paying the early adopter penalty and tax in every way. For what? To set some benchmarks? F***ing lol.

            Yeah, let me buy this super fast CPU, and then undervolt it right away, tinker with this and that BIOS settings, disable this E core, do this, do that.

            Or, buy an established Zen 3. Enable XMP, PBO Auto. Done. No problems.

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            • #76
              ARM as well as Apple have been using BIG-little designs for many years now. AMD has been rumored to migrate to a BIG-little uArch as well somewhere in the future. Maybe what Intel has implemented is not that bad after all. Maybe if the Linux kernel properly supported ADL CPUs we wouldn't have such a salty conversation.

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              • #77
                Originally posted by Markopolo View Post

                I wonder this as well. The scheduler issues are significant though. Look at the average power consumption for the two scenarios. P only was 50% more power. That’s significant enough to make me hesitant to compare the performance. Also keep in mind intel said that one P core has the same size as 4(!) E cores
                I guess that most of the P-core die size is taken up by the effectivelly useless AVX-512 block. Performance of a 10 P-core chip with AVX-512 enabled would be interesting to see. Since AVX-512 will probably remain restricted to specific workloads that most people don't run, maybe a consumer variant of Golden Cove without the -512 block would allow for 12 P-cores to fit on a die. Considering that the performance difference between 12700K and 12900K is quite negligible despite the 12700K being 4 E-cores and a few MHz short, such a chip could've been ideal for gamers ect.

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                • #78
                  Originally posted by birdie View Post

                  Looks like your final line of "reasoning" here is insults and I prefer to talk to civil and rational people instead.
                  Now why would you waste your precious time arguing civilly with a self-proclaimed Linux power-luser who doesn't even know how to compile a web browser and its dependencies?

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                  • #79
                    Just putting it out there, SAM is not the same thing as re-sizable bar. Resizable bar is just the optional part of the PCI'e spec that allows you specify whatever sized chunks from PCI'e, things like "smart access memory" from AMD is resizable bar + specific optimizations for CPU + tweaks for games.

                    The last bit is quite important because in quite a few games, enabling resizable bar actually slows the game down (and in some cases this slow down is non negligible, i.e. > 10%). The reason why AMD is ahead than Intel here is because they have done the necessary tweaking

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                    • #80
                      Originally posted by birdie View Post
                      ARM as well as Apple have been using BIG-little designs for many years now. AMD has been rumored to migrate to a BIG-little uArch as well somewhere in the future. Maybe what Intel has implemented is not that bad after all. Maybe if the Linux kernel properly supported ADL CPUs we wouldn't have such a salty conversation.
                      AMD's Zen CPUs are not as uniform as people think. Only AMD hides the details and presents a uniform multi-core CPU. One can certainly find cases where AMD's design shows weaknesses, but I have not yet seen anything as worrying as was shown here with Alder Lake.

                      The idea of hybrid designs is certainly not bad. What is bad is not to have the software ready on release to benefit from it as there is evidently much to gain from it.

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