ECC word not necessarily full cache line

By: Anon (no.delete@this.spam.com), September 18, 2022 11:54 am
Room: Moderated Discussions
David Kanter (dkanter.delete@this.realworldtech.com) on September 18, 2022 12:29 pm wrote:
> That's true, but sub-line ECC has a much higher area overhead.
> So maybe I'd state it as 'power or area, take your pick'...

Does it really matter? I mean, if you only modify 8 bytes out of the 64 bytes of the cache line then old_value XOR new_value should give you enough information to update the ECC bits of the entire cache line, only parity would actually appear per 8 bytes or so to not increase read latency too much.
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Data integrity of L1 cachesanon22022/09/15 06:04 PM
  Data integrity of L1 cachesGroo2022/09/15 10:46 PM
    Data integrity of L1 cachesanon22022/09/16 08:00 AM
      Data integrity of L1 cachesgroo2022/09/16 10:06 AM
        ECC outside critical path?hobold2022/09/16 12:03 PM
          ECC outside critical path?Mr. Camel2022/09/16 02:39 PM
            ECC outside critical path?anonymou52022/09/16 04:01 PM
          ECC outside critical path?anonymou52022/09/16 03:50 PM
            ECC outside critical path?hobold2022/09/17 05:57 AM
        Data integrity of L1 cachesanon22022/09/16 04:45 PM
  Data integrity of L1 cachesanon.12022/09/16 05:51 AM
    Data integrity of L1 cachesanon22022/09/16 08:04 AM
      Data integrity of L1 cachesBrett2022/09/16 11:12 AM
  Data integrity of L1 caches---2022/09/16 10:28 AM
    Data integrity of L1 cachesdmcq2022/09/16 12:41 PM
      Data integrity of L1 caches---2022/09/16 01:42 PM
    Data integrity of L1 cachesanon22022/09/16 04:49 PM
      Data integrity of L1 caches---2022/09/16 05:25 PM
        Read the thread (NT)anon22022/09/16 05:55 PM
        Data integrity of L1 cachesanon22022/09/16 05:57 PM
    Data integrity of L1 cachesMichael S2022/09/17 04:02 PM
  Data integrity of L1 cachesDavid Kanter2022/09/16 08:44 PM
    ECC word not necessarily full cache linePaul A. Clayton2022/09/17 09:59 AM
      ECC word not necessarily full cache lineDavid Kanter2022/09/18 11:29 AM
        ECC word not necessarily full cache lineAnon2022/09/18 11:54 AM
          ECC word not necessarily full cache linehobold2022/09/18 05:32 PM
            ECC word not necessarily full cache lineMichael S2022/09/19 07:47 AM
              ECC word not necessarily full cache linehobold2022/09/20 05:38 AM
                ECC word not necessarily full cache linedmcq2022/09/21 04:10 AM
                ECC word not necessarily full cache lineMichael S2022/09/21 05:55 AM
                  ECC word not necessarily full cache linehobold2022/09/21 12:59 PM
  Data integrity of L1 cachesDavid Hess2022/09/17 09:03 AM
  Data integrity of L1 cachesMichael S2022/09/17 04:12 PM
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