5~30% CPU speed reduction to your Intel CPU forecast

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  • January 22, 2018 at 5:09 pm #16025
    The DukeThe Duke
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      @sgb101
      Forumite Points: 5

      So who is responsible for self-builders rigs. The mobo OEM? Or will MS gist push not out?

      January 22, 2018 at 5:13 pm #16027
      Ed PEd P
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        @edps
        Forumite Points: 39

        IIrc only some ARM are affected.  Slower unoptimized chips such as that used by the Raspberry Pi are invulnerable to both attacks. AMD claim they do not have a meltdown problem, but the situation is far less clear wrt Spectre as M$ feel there is a need to patch Windows for it.

        This wiki summarizes the current state of play.

        Answering Steve – I am told that IBM have put the onus on the mobo manufacturers to roll out fixes.

        January 23, 2018 at 1:06 am #16079
        Wheels-Of-FireWheels-Of-Fire
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          @grahamdearsley
          Forumite Points: 4

          This is purely academic but the wiki is a bit confused about memory management, at least on windows.

          The wiki states that every process has the address range of every other process mapped into it. This is NOT the case.

          The Windows memory manager will stamp on any process that tries to access the private memory of another process. Even shared memory is not really an exception as it is accessed via a kernel call.

          As I have said before the problem we now have is because the systems Kernel memory IS mapped into the address range of every process.

          The windows memory manager will not bat an eye lid if a user process tries to access kernel memory but this should not be a problem because the CPU should imediatly recognise a privalege violation and generate an exception. It turns out though that there are ways around it.

          January 23, 2018 at 11:03 am #16084
          Ed PEd P
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            @edps
            Forumite Points: 39

            Intel have compounded their recent less than stellar reactions to the Meltdown/Spectre back-doors by having to withdraw their recent buggy fixes! It isn’t surprising they are getting a good tongue-lashing from everyone. link

            February 28, 2018 at 7:24 pm #17183
            Wheels-Of-FireWheels-Of-Fire
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              @grahamdearsley
              Forumite Points: 4

              Just an up date.

              I just ran the InSpectere utillity again on my mum’s PC and it now shows Windows protection against Meltdown but still no protection against Spectre.

              The report says the CPU dose not have hardware support for the windows patch so the system is being slowed and that a microcode/Bios update would be needed to fix Spectre.

              CPU Intel J2900

              Windows 1709 Build 16299.192

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