Ethernet Support

One of the benefits to the previous generation of Xeon D was its support for dual 10 gigabit Ethernet controllers integrated into the processor, thus only requiring PHY (physical layer) chips for support. For almost all of the processors in the stack, that moves up to quad 10GbE support, either through copper or fiber. These ports also support accelerated Remote Direct Memory Access (RDMA) and native Software Fault Isolation (SFI).


Taken from our Skylake-SP workshop slide decks

We confirmed with Intel that any third party PHY can be used, not just Intel. Some vendors that have already listed Xeon D-2100 motherboards have included 25 GbE support in their technical specifications – we clarified with Intel that there is no 25 GbE support included on the chip, so those system integrations must be using external MAC/PHYs or PCIe cards in order to include that support.

Intel QuickAssist Technology

On Intel’s QuickAssist Technology: this is still relatively new to most users. QAT is essentially an offload processor for a variety of cryptographic functions, including symmetric/asymmetric encryption, authentication, digital signatures, RSA, ECC, and so on. The idea is this sort of task would normally be handled by the CPU, taking up time and power that could be better spent elsewhere, and that a dedicated engine to this (QAT) would be faster and more power efficient. Intel has so far deployed QAT in its Denverton Atom C3000 series processors, Xeon Scalable chipets, and add-in PCIe cards, but it now comes to the Xeon D-2100 series as well. It was not present on the original D-1500 series processors, however Intel did have mid-cycle updates (such as the D-1553N) which had 40 Gbps QAT support.

Taken from our Skylake-SP workshop slide decks

The implementation of QAT on the Xeon D-2100 series uses its own PCIe 3.0-like interconnect inside the chip, although Intel did not elaborate as to what this entails. We do know that for the Xeon Scalable chipset implementations, the chipset requires up to 16 lanes of PCIe 3.0 to accelerate QAT, so we do expect that Intel is using the equivalent in bandwidth. We have asked for more information, as to whether the QAT engine is actually on chip, or if the PCIe silicon variant is part of the package. I would expect the former, although the latter is easier - this could be identical to the Xeon-SP 18-core silicon found in the enterprise processors, that already have 16 on-package lanes set aside for OmniPath Fabric. 

It is worth noting that 100 Gbps QAT support is only for a couple of the Xeon D-2100 processors, with a couple of others giving 40 Gbps and 20 Gbps.

Intel Launches Xeon D-2100 Series SoCs Migrating from Broadwell to Skylake-SP
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  • Elstar - Wednesday, February 7, 2018 - link

    I'm not sure what/who the target market is for the D-2191. The core count says "high end", but the TDP, base frequency, DDR frequency, and unique lack of integrated Ethernet is weird. It feels more like an "embedded Xeon-W" than a "Xeon-D". Reply
  • IntelUser2000 - Wednesday, February 7, 2018 - link

    Here's what one article had to say:

    "Looking back to the previous generation, Facebook utilized Mellanox multi-host adapters along with a custom version of the original Xeon D to lower networking costs and improve performance. We suspect that Intel is keenly aware of this and that is a part of the reason for that de-feature move."
    Reply
  • Elstar - Wednesday, February 7, 2018 - link

    That explains it. And after a few quick searches, I found Open Compute Project PDFs that explain the setup where integrated networking would be pointless. Thanks! Reply
  • Lakados - Wednesday, February 7, 2018 - link

    Always read the fine print:
    Benchmark results were obtained prior to implementation of recent software patches and firmware updates intended to address exploits referred to as "Spectre" and "Meltdown". Implementation of these updates may make these results inapplicable to your device or system.

    While I can see uses for these, until I see how they run with the patches in place this announcement is garbage.
    Reply
  • pavag - Wednesday, February 7, 2018 - link

    So, you pay $2400 for Meltdown and Spectre? Reply
  • Hurr Durr - Thursday, February 8, 2018 - link

    You`ve been paying for it for 20 years now without a single peep. You'll buy your Mossad processor and you will like it, goy. Reply
  • prisonerX - Friday, February 9, 2018 - link

    It's strange, I had to change to my AMD system to type "Palestinian genocide/Apartheid" it wouldn't work on my i5 box. Reply
  • Hurr Durr - Saturday, February 10, 2018 - link

    My i5 box always tries to inject something about toxic masculinity and opressive whiteness into every text I type in Word! Reply
  • none12345 - Thursday, February 8, 2018 - link

    Showcasing benchmark results without applying critical patches seems wrong on every level. Reply
  • prisonerX - Friday, February 9, 2018 - link

    Just subtract 30% and you've got it. Reply

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