6 ms·

At these kinds of speeds, why would we use it for just video? We could make server interconnects extremely fast.

by anameaname 9y ago

ams6110 9y ago
Modern HPC interconnects are already faster than 48Gb/s
- implr 9y ago
  Those are usually quite expensive. If HDMI requires 48Gb/s capable transceiver chips to be built into every TV, they will get really cheap very fast. It might not be a viable solution in the end, but it could work for some applications.
  - paulmd 9y ago
    40 gbps is only Infiniband QDR speeds, you can pick up an adapter for sub-$50 right now.
    - notyourwork 9y ago
      And plug it into what?
      - paulmd 9y ago
        Your servers? If you mean switching, you don't need a switch for simply connecting two computers. Presumably that was the use-case supported by "HDMI-as-network-layer". If you watch around, you can get Mellanox Voltaire rack switches for $200 or less. QDR gear is "obsolete" and often surplused at very attractive prices. Everyone else has moved onto FDR or EDR speeds.
      - ams6110 9y ago
        Your can get e.g. a qlogic qdr infiniband switch for a few hundred dollars
  - 0xcde4c3db 9y ago
    Over typical HDMI distances, you don't really need an expensive transceiver. 100GbE can be done over direct attach cables that cost less than many current "premium" HDMI cables. Much of the cost beyond that is related to the MAC and host interface being able to do something interesting with the packets.
fgonzag 9y ago
You can get 40 Gbps infiniband cards for $200 now a days. The switches are a bit expensive (you can probably find them for 3-4K if you look hard enough), but that's not that expensive for a data center.
gh02t 9y ago
Isn't the high bandwidth path for HDMI uni-directional? Not half-duplex, but actually one way only, as in the receiver doesn't have the hardware to transmit back (on those lines). I'm not terribly knowledgeable about HDMI but I think that's basically the case, someone please correct me or elaborate if they know more. There are some other bi-directional communications channels for control and other features like DRM (HDCP) or even Fast Ethernet but they don't get nearly that much bandwidth.

At these kinds of speeds, why would we use it for just video? We could make server interconnects extremely fast.

ams6110 9y ago

Modern HPC interconnects are already faster than 48Gb/s

implr 9y ago
Those are usually quite expensive. If HDMI requires 48Gb/s capable transceiver chips to be built into every TV, they will get really cheap very fast. It might not be a viable solution in the end, but it could work for some applications.
- paulmd 9y ago
  40 gbps is only Infiniband QDR speeds, you can pick up an adapter for sub-$50 right now.
  - notyourwork 9y ago
    And plug it into what?
    - paulmd 9y ago
      Your servers? If you mean switching, you don't need a switch for simply connecting two computers. Presumably that was the use-case supported by "HDMI-as-network-layer". If you watch around, you can get Mellanox Voltaire rack switches for $200 or less. QDR gear is "obsolete" and often surplused at very attractive prices. Everyone else has moved onto FDR or EDR speeds.
    - ams6110 9y ago
      Your can get e.g. a qlogic qdr infiniband switch for a few hundred dollars
- 0xcde4c3db 9y ago
  Over typical HDMI distances, you don't really need an expensive transceiver. 100GbE can be done over direct attach cables that cost less than many current "premium" HDMI cables. Much of the cost beyond that is related to the MAC and host interface being able to do something interesting with the packets.

fgonzag 9y ago

You can get 40 Gbps infiniband cards for $200 now a days. The switches are a bit expensive (you can probably find them for 3-4K if you look hard enough), but that's not that expensive for a data center.

gh02t 9y ago

Isn't the high bandwidth path for HDMI uni-directional? Not half-duplex, but actually one way only, as in the receiver doesn't have the hardware to transmit back (on those lines). I'm not terribly knowledgeable about HDMI but I think that's basically the case, someone please correct me or elaborate if they know more. There are some other bi-directional communications channels for control and other features like DRM (HDCP) or even Fast Ethernet but they don't get nearly that much bandwidth.