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A comment on Open-sourcing a more precise time appliance. Parent comment

Re:Open-sourcing a more precise time appliance by cbhl on Wednesday August 11, 2021 @10:32AM (#28142472)
It looks like the source for their FBOSS agent that runs on switches will enable PTP in two kinds of supported switches:

https://github.com/facebook/fboss/blob/master/fboss/agent/hw...

They have O(thousands) of switches (source: https://engineering.fb.com/2016/10/18/data-center-engineerin...) so IIRC they get the per-switch cost down by doing a custom design to reduce BOM. I believe the specs and designs are available under the Open Compute project here (search for "Facebook"): https://www.opencompute.org/wiki/Networking/SpecsAndDesigns

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Re:Open-sourcing a more precise time appliance by jeffbee on Wednesday August 11, 2021 @10:56AM (#28142767)
Even the retail price of 1 switch based on their "wedge" design is less than $10k for 32 100gbps ports. Merchant silicon like the Broadcom 56000-series switch ASICs support PTP.
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