Ultra Ethernet Specification v1.0 [pdf]

That so much of the document is about how UltaEthernet maps to Libfabric rather confirms that premise! There's also a credit based flow system, and connection manager roles, which are also easily identifiable Infiniband concepts.

I'm interested to see what the optional hardware features are. And what their relationship is to the different UE profiles (AI Base, AI Full, and HPC).

> The Ultra Ethernet Transport (UET) layer is designed to handle the most challenging application scale, deliver packets reliably and securely, manage and avoid congestion within the network, and react to contention at the endpoints. Its goals are minimal tail latency and highest network utilization. At the same time, UET is designed to enable simple hardware and software implementations – such as what might be required for accelerator-integrated endpoints. UET can be programmed through the OFI libfabric standard interface. It sets out to address the shortcomings of RoCEv2, specifically its semantics, transport layer, wire operations, implementation complexities, and scale limits

Re: Ultra Ethernet Specification v1.0 [pdf]

#6

Post by [deleted] » Wed, Jun 11, 2025, 5:02 PM UTC

frantathefranta wrote: post #2

Skimming this, it looks like it's trying compete with Infiniband, but combining it with plain Ethernet?

[deleted]

Re: Ultra Ethernet Specification v1.0 [pdf]

#7

Post by [deleted] » Wed, Jun 11, 2025, 5:03 PM UTC

datadrivenangel wrote: post #3

Ethernet but for AI!

[deleted]

Re: Ultra Ethernet Specification v1.0 [pdf]

#8

Post by bobmcnamara » Wed, Jun 11, 2025, 5:05 PM UTC

frantathefranta wrote: post #2

Skimming this, it looks like it's trying compete with Infiniband, but combining it with plain Ethernet?

Seems like it. Sorta how storage grade Ethernet took out fiber channel. Probably shares a lot with it in some of the lower layers.

Re: Ultra Ethernet Specification v1.0 [pdf]

#9

Post by [deleted] » Wed, Jun 11, 2025, 5:09 PM UTC

frantathefranta wrote: post #2

Skimming this, it looks like it's trying compete with Infiniband, but combining it with plain Ethernet?

[deleted]

Re: Ultra Ethernet Specification v1.0 [pdf]

#10

Post by deaddodo » Wed, Jun 11, 2025, 5:20 PM UTC

jauntywundrkind wrote: post #5

frantathefranta wrote: post #2

Skimming this, it looks like it's trying compete with Infiniband, but combining it with plain Ethernet?

That so much of the document is about how UltaEthernet maps to Libfabric rather confirms that premise! There's also a credit based flow system, and connection manager roles, which are also easily identifiable Infiniband concepts. I'm interested to see what the optional hardware features are. And what their relationship is to the different UE profiles (AI Base, AI Full, and HPC). > The Ultra Ethernet Transport (UET) l…

Self-admittedly less knowledgeable about this subject, but how does this differ from IBoE?