On Wed, 7 Aug 2024 at 17:41, Brandon Martin <lists.nanog@monmotha.net> wrote:
Among the other reasons folks have given, the 10GBASE-T PHY has added latency beyond the basic packetization/serialization delay inherent to Ethernet due to the use of a relatively long line code plus LDPC. It's not much (2-4us which is still less than 1000BASE-T serialization+packetization latency with larger packets), but it's more than 10GBASE-R PHYs. The HFT guys may care, but most other folks probably don't give a hoot.
I think this is the least bad explanation, some explanations are that copper may not be available, but that doesn't explain preference. Nor do I think wattage/heat explains preference, as it's hosted, so customers probably shouldn't care. Latency could very well explain preference, but it seems doubtful, when hardware is so underspecified, surely if you are talking in single microseconds or nanoseconds budget, the actual hardware becomes very important, so i think lack of specificity there implies it's not about latency. -- ++ytti