Facebook’s Switch from ntpd to chrony for a More Accurate, Scalable NTP Service
Facebook's engineering team wrote about their approach on how they built a more accurate and scalable Network Time Protocol service by replacing ntpd with chrony and a multi-layered architecture.
Mar 22, 2020 ... Facebook switched from ntpd to chrony after their tests found it to be "more ... Smearing is used by Google, AWS, and Facebook NTP servers.