Crazy CXL Names

By: anon2 (anon.delete@this.anon.com), May 31, 2022 2:24 am
Room: Moderated Discussions
Peter Lewis (peter.delete@this.notyahoo.com) on May 30, 2022 9:30 pm wrote:
> >> Intel is saying that CXL has multiple protocols and the protocol needed for cache-coherent access
> >> to GPUs and PCIe-attached DRAM is not included in the first implementation.
> >
> >That's exactly what CXL is, that was in the CXL standard from the start.
>
> Maybe I have some misunderstanding. At Hot Chips last year, Intel said that Sapphire
> Rapids will not support CXL.mem. My understanding is that means Sapphire Rapids
> will not support cache-coherent access to GPUs and PCIe-attached DRAM.

I mean the 3 CXL protocols. AFAIK they never came out and said CXL was one protocol and that you must support everything.

And I think your understanding is about right. If they support CXL.cache then in theory they would support GPU accessing system memory coherently with the host. Perhaps that is more important for GPUs? Or maybe they have a different user in mind like FPGA.

>
> > The naming is less stupid than many other names in technology
>
> The names for the different versions of USB 3 set a world-record for stupidness that would
> be difficult for anything to beat. Even if the intended users are smart enough to eventually
> figure out that the names mean, that is no reason for making it confusing.

Well, like I said it's not really that confusing. CXL has 3 protocols. io to support traditional IO adapters, mem to export memory to host, cache to participate in coherency as an agent / master.
< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
Crazy CXL NamesPeter Lewis2022/05/30 03:54 PM
  Crazy CXL Namesanon22022/05/30 07:19 PM
    Crazy CXL NamesPeter Lewis2022/05/30 09:30 PM
      Crazy CXL Namesanon22022/05/31 02:24 AM
        Crazy CXL NamesPeter Lewis2022/05/31 02:43 AM
          Crazy CXL Namesanon22022/05/31 03:01 AM
            Crazy CXL NamesPeter Lewis2022/05/31 03:36 AM
              Crazy CXL Namesanon22022/05/31 04:32 AM
                Crazy CXL NamesPeter Lewis2022/05/31 05:21 AM
                  Crazy CXL Namesanon22022/05/31 06:03 AM
                    Crazy CXL NamesPeter Lewis2022/05/31 04:27 PM
                      Crazy CXL Namesanon22022/05/31 04:58 PM
                      Crazy CXL Namesgoose2022/05/31 05:35 PM
                        Crazy CXL NamesPeter Lewis2022/06/03 03:10 AM
                          Reason for Crazy CXL NamesGary Kopp2022/06/24 01:43 PM
                            Reason for Crazy CXL Namesdmcq2022/06/25 11:18 AM
                              Reason for Crazy CXL NamesMichael S2022/06/26 01:30 AM
                                Reason for Crazy CXL NamesDummond D. Slow2022/06/26 06:49 AM
                                  Reason for Crazy CXL NamesMichael S2022/06/26 07:32 AM
                                    Reason for Crazy CXL Namesdmcq2022/06/26 11:54 AM
                                Reason for Crazy CXL Namesanon22022/06/26 03:26 PM
                                  Reason for Crazy CXL NamesEric P2022/07/01 02:48 PM
                                    Reason for Crazy CXL Namesanon22022/07/01 07:56 PM
                                      Reason for Crazy CXL NamesGroo2022/07/02 05:13 AM
                                    Reason for Crazy CXL NamesUngo2022/07/01 11:14 PM
                                      Reason for Crazy CXL NamesEric P2022/07/05 03:21 AM
                      Crazy CXL NamesDoug S2022/06/01 12:44 AM
    Crazy CXL NamesMichael S2022/05/31 01:21 AM
      Crazy CXL Namesanon22022/05/31 02:20 AM
      Crazy CXL NamesPeter Lewis2022/05/31 02:24 AM
        Crazy CXL NamesMichael S2022/05/31 03:07 AM
          Crazy CXL NamesPeter Lewis2022/05/31 04:37 AM
            Current NVidia GPU Launch Latency: 10 microsecondsMark Roulo2022/05/31 01:07 PM
              Current NVidia GPU Launch Latency: 10 microsecondsFreddie2022/06/01 09:44 AM
      Crazy CXL Names---2022/05/31 07:56 PM
        Crazy CXL Namesaaron spink2022/05/31 08:32 PM
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