Crazy CXL Names

By: anon2 (anon.delete@this.anon.com), May 31, 2022 4:32 am
Room: Moderated Discussions
Peter Lewis (peter.delete@this.notyahoo.com) on May 31, 2022 3:36 am wrote:
> > I don't see how that addresses what I wrote. You just repeated yourself (which I agreed with).
>
> Sorry. I’m tired. I agree that the GPU accessing host memory coherently is something people want.
>
> People also want the host CPU to be able to access the GPU’s HBM coherently. And people want the host
> CPU to be able to access PCIe-attached DRAM coherently. I thought these are the main selling points of
> CXL.

In my opinion it will be tiered memory devices the main thing and easier to implement for host and device. Which is why I was surprised Intel came out with CXL.cache but not CXL.mem.

Maybe they think they have some killer application with FPGA, I don't know. It didn't seem to help POWER9 + NVIDIA GPU very much but I don't know much about GPU concerns to know why. I have heard claims about it being more useful with much higher bandwidth between CPU and GPU and high bandwidth system memory, but I don't know if that is just more of the same kind of handwaving that also assured us it would be a great idea with POWER9 and V100 class machines, or if it will actually be useful.

> Since Sapphire Rapids does not support these things, I don’t understand why Intel is even bothering
> to say Sapphire Rapids supports CXL. Intel is just going to disappoint people once people understand what
> Sapphire Rapids can actually do. No one will write two versions of their GPU software, one for processors
> that only support CXL.cache and another for processors that support both CXL.cache and CXL.mem.

I don't think it really will disappoint people who don't know what these things are, they'll plug in their GPU and it will work in a non-coherent mode with performance matching the review sites that tested the combination.
< 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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