Enough with the idiocy ... let's have proper ECC again.

By: rwessel (rwessel.delete@this.yahoo.com), December 20, 2020 8:43 am
Room: Moderated Discussions
Adrian (a.delete@this.acm.org) on December 20, 2020 2:06 am wrote:
> Brett (ggtgp.delete@this.yahoo.com) on December 19, 2020 8:13 pm wrote:
> >
> > What exactly is wrong with moving ECC on chip as is being done?
> > On chip the ECC is faster and does not involve the CPU, so one bit flips by cosmic ray strikes are fixed.
> > Most systems only have one or two RAM chips, now those systems can have ECC.
> > Denser chips are more error prone, so eventually all RAM chips will have ECC.
> > The cost to add one bit to a 128 bit access is cheap at under 1%, so high
> > quality multi bit ECC is cheap and what is cheap becomes widespread.
> >
> > Manufacturing wise you test the chips and those with hard errors fixed by ECC you sell as
> > non-ECC chips at full price, instead of at half price as you disabled half the array.
> > Right now hard errors are handled by spares, but you don’t need spares with on chip ECC. So
> > a chip with ECC is not bigger and more expensive, the spares are just getting used actively.
> > This is why ECC is moving on chip, it’s the best place to do ECC.
> >
> > Thus I predict that the era of RAM bit flip errors will shortly be largely over.
>
>
> No, this is very wrong.
>
> There must not exist any place in a digital system where the data bits are not accompanied
> by some form of error detection and preferably also correction bits.
>
> This is equally true for the places where information is stored, i.e. inside memories,
> and for the places through which information is transferred, i.e. communication
> links, like the DDR links between CPUs and memory ICs or modules.
>
> Regardless how small a place is, where the data bits are stripped
> by any redundancy, the error probability becomes non-negligible.
>
> Modern digital communication links have many very-high-frequency low-amplitude
> signals crowded in a small space and errors due to noise are unavoidable.
>
>
>
>
> Any Intel propagandist that claims that you should buy any kind of digital equipment
> where information is stored or transmitted in a non-redundant form, either does not
> know how hardware works or he fakes not knowing this in order to fool you.


Indeed, we have error checking on SATA, SAS, USB, networks, PCIe (v6 adds FEC), storage devices, on the caches in most CPUs, etc. The one thing glaringly missing is memory.
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TopicPosted ByDate
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                In-band ECC support in recent Atom SoCs & Tiger Lake Urwessel2020/12/17 09:51 AM
                  In-band ECC support in recent Atom SoCs & Tiger Lake UMichael S2020/12/17 12:22 PM
    Enough with the idiocy ... let's have proper ECC again.Björn Ragnar Björnsson2020/12/16 10:09 PM
      Enough with the idiocy ... let's have proper ECC again.Maxwell2020/12/17 12:58 AM
        Enough with the idiocy ... let's have proper ECC again.pixiespeed2020/12/17 09:04 AM
      Enough with the idiocy ... let's have proper ECC again.Adrian2020/12/17 07:40 AM
      Enough with the idiocy ... let's have proper ECC again.Maynard Handley2020/12/17 09:09 AM
        Enough with the idiocy ... let's have proper ECC again.Etienne Lorrain2020/12/17 09:26 AM
          Enough with the idiocy ... let's have proper ECC again.Maynard Handley2020/12/17 09:42 AM
            Enough with the idiocy ... let's have proper ECC again.David Kanter2020/12/17 12:04 PM
              Enough with the idiocy ... let's have proper ECC again.Doug S2020/12/17 01:03 PM
              Enough with the idiocy ... let's have proper ECC again.phonon2020/12/17 03:25 PM
                Internal array ECC vs. memory controllerDavid Kanter2020/12/19 10:39 AM
                  Internal array ECC vs. memory controllerJörn Engel2020/12/20 10:42 AM
                    Internal array ECC vs. memory controllerrwessel2020/12/20 10:52 AM
                    Internal array ECC vs. memory controllerDavid Kanter2020/12/20 03:44 PM
              Enough with the idiocy ... let's have proper ECC again.Maynard Handley2020/12/17 04:55 PM
                Enough with the idiocy ... let's have proper ECC again.rwessel2020/12/17 07:34 PM
                  Enough with the idiocy ... let's have proper ECC again.Maynard Handley2020/12/17 09:10 PM
                    Enough with the idiocy ... let's have proper ECC again.Maynard Handley2020/12/17 09:43 PM
                      Enough with the idiocy ... let's have proper ECC again.Maynard Handley2020/12/18 09:30 AM
                        Enough with the idiocy ... let's have proper ECC again.anon22020/12/19 01:00 AM
                          Enough with the idiocy ... let's have proper ECC again.Maynard Handley2020/12/19 10:23 AM
                            Enough with the idiocy ... let's have proper ECC again.anon22020/12/19 03:01 PM
                              Enough with the idiocy ... let's have proper ECC again.Maynard Handley2020/12/19 04:23 PM
                                Enough with the idiocy ... let's have proper ECC again.anon22020/12/19 04:30 PM
              Enough with the idiocy ... let's have proper ECC again.Björn Ragnar Björnsson2020/12/17 07:41 PM
                Enough with the idiocy ... let's have proper ECC again.David Hess2020/12/19 08:48 PM
              Enough with the idiocy ... let's have proper ECC again.Memory Guy2020/12/17 09:19 PM
      Enough with the idiocy ... let's have proper ECC again.rwessel2020/12/17 10:01 AM
      Enough with the idiocy ... let's have proper ECC again.Wes Felter2020/12/18 09:38 PM
        Thanks for the confirmation!David Kanter2020/12/19 11:51 AM
          Thanks for the confirmation!Konrad Schwarz2020/12/20 09:34 AM
            Thanks for the confirmation!Niels Jørgen Kruse2020/12/20 11:01 AM
              Thanks for the confirmation!David Kanter2020/12/20 03:45 PM
              Thanks for the confirmation!Gionatan Danti2020/12/21 12:50 AM
                Thanks for the confirmation!Niels Jørgen Kruse2020/12/21 09:07 AM
            Thanks for the confirmation!David Kanter2020/12/20 03:42 PM
              Thanks for the confirmation!Foo_2020/12/21 02:01 AM
                Thanks for the confirmation!David Kanter2020/12/21 08:39 AM
            Thanks for the confirmation!Paul2020/12/20 11:29 PM
              Thanks for the confirmation!Michael S2020/12/21 01:00 AM
                Thanks for the confirmation!anon20202020/12/21 01:44 AM
                Thanks for the confirmation!Paul2020/12/22 12:42 PM
                  Thanks for the confirmation!Michael S2020/12/22 02:28 PM
                    Thanks for the confirmation!Paul2020/12/22 06:12 PM
                      Thanks for the confirmation!Michael S2020/12/23 02:55 PM
                        Thanks for the confirmation!Paul2020/12/23 03:54 PM
                          Thanks for the confirmation!Dan Fay2020/12/23 04:38 PM
                            Thanks for the confirmation!Paul2020/12/26 04:10 AM
                              Thanks for the confirmation!Björn Ragnar Björnsson2020/12/26 08:37 PM
                                Thanks for the confirmation!anon22020/12/27 02:00 AM
                                Thanks for the confirmation!Doug S2020/12/28 12:47 PM
            Thanks for the confirmation!David Hess2020/12/21 06:35 PM
              Thanks for the confirmation!Konrad Schwarz2020/12/22 12:08 AM
                Thanks for the confirmation!Doug S2020/12/22 10:42 AM
                  Thanks for the confirmation!David Hess2020/12/22 12:32 PM
                Thanks for the confirmation!David Hess2020/12/22 12:21 PM
        Enough with the idiocy ... let's have proper ECC again.Björn Ragnar Björnsson2020/12/19 04:25 PM
          Enough with the idiocy ... let's have proper ECC again.Brett2020/12/19 08:13 PM
            Enough with the idiocy ... let's have proper ECC again.David Hess2020/12/19 09:17 PM
              Enough with the idiocy ... let's have proper ECC again.Konrad Schwarz2020/12/21 03:29 AM
                Enough with the idiocy ... let's have proper ECC again.David Hess2020/12/21 06:49 PM
            Enough with the idiocy ... let's have proper ECC again.Björn Ragnar Björnsson2020/12/19 09:57 PM
              Enough with the idiocy ... let's have proper ECC again.Björn Ragnar Björnsson2020/12/19 10:14 PM
            Enough with the idiocy ... let's have proper ECC again.Adrian2020/12/20 02:06 AM
              Enough with the idiocy ... let's have proper ECC again.rwessel2020/12/20 08:43 AM
             Multi-level DRAM?Brett2020/12/20 08:07 PM
               Multi-level DRAM?Heikki Kultala2020/12/21 11:58 AM
               Multi-level DRAM?David Hess2020/12/21 07:25 PM
                 Multi-level DRAM?Adrian2020/12/22 05:15 AM
                   Multi-level DRAM?Dan Fay2020/12/22 10:11 AM
                     Multi-level DRAM?Paul2020/12/22 06:01 PM
                       Multi-level DRAM?Dan Fay2020/12/23 12:29 PM
                         Multi-level DRAM?Paul2020/12/23 01:00 PM
                           Multi-level DRAM?Dan Fay2020/12/23 04:30 PM
                             Multi-level DRAM?David Hess2020/12/23 05:05 PM
                           Multi-level DRAM?Björn Ragnar Björnsson2020/12/25 06:44 PM
                             Multi-level DRAM?Paul2020/12/26 04:04 AM
                               Multi-level DRAM?Michael S2020/12/26 08:11 AM
                                 DIMM binsPaul2020/12/26 08:55 AM
                                   DIMM binsBjörn Ragnar Björnsson2020/12/26 08:09 PM
                                     DIMM binsBjörn Ragnar Björnsson2020/12/26 08:19 PM
                                       DIMM binsDaniel Fay2020/12/27 07:51 PM
                                  Is binning at the module or die level? (NT)anonymous22020/12/27 02:36 PM
                                    Is binning at the module or die level?David Hess2020/12/28 01:31 PM
                               Multi-level DRAM?Doug S2020/12/28 12:55 PM
                               Multi-level DRAM?David Hess2020/12/28 01:36 PM
                             Multi-level DRAM?anon­­32020/12/26 10:22 PM
                               Multi-level DRAM?Björn Ragnar Björnsson2020/12/27 07:12 PM
                               Multi-level DRAM?Paul2021/01/04 04:20 AM
               Multi-level DRAM?Carson2021/01/05 12:14 PM
                 Multi-level DRAM?Brett2021/01/05 02:05 PM
        Enough with the idiocy ... let's have proper ECC again.Björn Ragnar Björnsson2020/12/19 04:35 PM
        Enough with the idiocy ... let's have proper ECC again.David Hess2020/12/19 08:59 PM
          Enough with the idiocy ... let's have proper ECC again.rwessel2020/12/20 08:56 AM
          Enough with the idiocy ... let's have proper ECC again.Doug S2020/12/20 10:16 AM
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