Trying to understand more about the benchmarks, couple of questions I have are:
1. In slide 6 of 1Tb/s presentation[1] it says Intel® Xeon® 6338N 32 Cores, 2.2 GHz, 42 MB Cache, but Intel arc[2] shows a cache of 48MB. I presume this is a typo in the presentation slide. [1] https://fd.io/presentations/Fdio-Icelake-Demo-v11i.pdf [2] https://ark.intel.com/content/www/us/en/ark/products/212633/intel-xeon-gold-6338n-processor-48m-cache-2-20-ghz.html 2. Xeon® Gold 6338N Processor has 64 PCI Express v4.0 lanes. Same slide 6 shows Network I/O PCIe Gen4: 600 Gbps. I am trying to understand how that calculation is made. If I understand it correctly, each PCIe 4.0 lane has a bandwidth of 1.98GB/s[3] or 15.76 Gb/s which gives a total of 1006.64. [3] https://en.wikipedia.org/wiki/PCI_Express 3. Checking the specs[3] of Intel E810-2CQDA2, it needs 16 lanes of PCIe 4.0, while Xeon® Gold 6338N has 64 lanes. Slide 12 of the presentation says: "nominal forwarding rate for tested FD.io VPP configuration is 600 Gbps per Processor." My understanding is that to achieve 600 Gbps of _forwarding_ rate the system needs 6 100Gbps card pair. ie one in and one out x 6. With 64 lanes in the processor, I am not able to figure out how 6 cards where connected to a single processor. [4] https://www.intel.com/content/www/us/en/products/sku/210969/intel-ethernet-network-adapter-e8102cqda2/specifications.html 4. Same slide no 12 says "Not all cores are used." I was wondering if the actual number of cores used for this benchmark is published some where for reference. I am curios about how DDIO performed during this test and if there was any cache evictions of packet to main memory, also how exactly the full traffic load was distributed across the cards and across the cores. The benchmark gave a fantastic result about the capability of VPP and latest intel CPUs, but more information about the tests would others to replicate as well as to learn from this Cheers! X.
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