You're right, I did enjoy reading the paper. The graph cycles are neat, but they even admit in their own paper [0] that the approach is limited to half the max

You're right, I did enjoy reading the paper. The graph cycles are neat, but they even admit in their own paper [0] that the approach is limited to half the max path asymmetry (RTT/2 if the asymmetry is totally unknown) -- pure software clocks have hard lower bounds on accuracy that can't be overcome without additional information (which digging elsewhere on their site it looks like they do actually integrate with sources like GPS antennas). The rest of it is actually pretty interesting; in a datacenter context you might very well have low asymmetry, and everything else seems well done and likely to be much better than NTP for common scenarios. [0] https://www.usenix.org/system/files/conference/nsdi18/nsdi18-geng.pdf https://www.usenix.org/system/files/conference/nsdi18/nsdi18...