RIP Optane/XPoint

By: David Hess (davidwhess.delete@this.gmail.com), August 3, 2022 3:48 am
Room: Moderated Discussions
Doug S (foo.delete@this.bar.bar) on August 1, 2022 8:37 am wrote:
> anon2 (anon.delete@this.anon.com) on July 31, 2022 10:55 pm wrote:
> > The hard problem for NAND is random read latency.
>
> Can you expand on that further? What makes random reads a problem for NAND? True they
> aren't as fast as sequential but hardly seem to be an issue for modern SSDs.

The problem is that every random read requires loading an entire block, or perhaps a large fraction of a block, of 2048+64 or 4096+128 bytes and executing ECC before the data becomes available. That makes for a latency on the order of 50 microseconds or longer.
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TopicPosted ByDate
RIP Optane/XPointWes Felter2022/07/28 07:53 PM
  RIP Optane/XPointRayla2022/07/28 08:28 PM
  RIP Optane/XPointDoug S2022/07/28 09:00 PM
    RIP Optane/XPointNoSpammer2022/07/29 01:50 AM
    NVDIMM-NEric L2022/07/29 03:36 AM
    RIP Optane/XPointMichael S2022/07/29 04:02 AM
      RIP Optane/XPointDoug S2022/07/29 10:40 AM
        RIP Optane/XPointDoug S2022/07/29 10:43 AM
          RIP Optane/XPointLinus Torvalds2022/07/29 11:20 AM
            RIP Optane/XPointDavid Hess2022/07/29 08:59 PM
              RIP Optane/XPointDavid Hess2022/07/30 03:44 PM
                RIP Optane/XPointDoug S2022/07/30 10:43 PM
                  RIP Optane/XPointrwessel2022/07/31 05:33 AM
                  RIP Optane/XPointKonrad Schwarz2022/08/02 08:06 AM
                  RIP Optane/XPointDavid Hess2022/08/02 10:24 PM
                    RIP Optane/XPointDavid Hess2022/08/02 10:26 PM
                    RIP Optane/XPointAdrian2022/08/03 01:19 AM
        RIP Optane/XPointanonymou52022/07/29 12:50 PM
    RIP Optane/XPointGionatan Danti2022/07/29 09:09 AM
    RIP Optane/XPointMark Roulo2022/07/29 10:02 AM
      RIP Optane/XPointdmcq2022/07/30 03:42 AM
      RIP Optane/XPointanon32022/07/31 10:19 PM
        RIP Optane/XPointanon22022/07/31 10:55 PM
          RIP Optane/XPointDoug S2022/08/01 08:37 AM
            RIP Optane/XPointGionatan Danti2022/08/01 01:33 PM
              RIP Optane/XPointNoSpammer2022/08/02 03:50 AM
                RIP Optane/XPointDoug S2022/08/02 09:24 AM
                  RIP Optane/XPointGionatan Danti2022/08/02 10:34 AM
                  RIP Optane/XPoint---2022/08/02 10:39 AM
            RIP Optane/XPointDavid Hess2022/08/03 03:48 AM
              RIP Optane/XPointMichael S2022/08/03 06:04 AM
                RIP Optane/XPointDavid Hess2022/08/03 08:56 AM
        RIP Optane/XPointAdrian2022/08/01 02:15 AM
          RIP Optane/XPointGionatan Danti2022/08/01 06:07 AM
            Losses vs not profitable enoughMark Roulo2022/08/01 10:15 AM
              Losses vs not profitable enoughdmcq2022/08/01 11:50 AM
                Losses vs not profitable enoughGionatan Danti2022/08/01 12:34 PM
            RIP Optane/XPointMichael S2022/08/01 02:47 PM
              RIP Optane/XPointAnon2022/08/01 03:09 PM
                RIP Optane/XPointMichael S2022/08/01 03:32 PM
      RIP Optane/XPointGroo2022/08/01 12:28 PM
        RIP Optane/XPointanon32022/08/01 10:33 PM
          RIP Optane/XPointGroo2022/08/03 11:15 AM
            RIP Optane/XPoint---2022/08/03 03:05 PM
    LatencyDavid Kanter2022/07/29 06:35 PM
  Operating system and driver overheadEric L2022/07/29 03:44 AM
    Operating system and driver overheadLinus Torvalds2022/07/29 10:45 AM
  altrernatives?Michael S2022/07/29 05:17 AM
    altrernatives?Rayla2022/07/29 06:49 AM
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