[yugabyte#21963] YSQL: Configure clockbound agent

docs/content/preview/deploy/manual-deployment/system-config.md

@@ -23,6 +23,8 @@ In particular, the main YugabyteDB process, the YB-TServer, is multi-threaded. A
 
 ## ntp
 
+YugabyteDB relies on clock synchronization to guarantee consistency in distributed transactions.
+
 If your instance does not have public Internet access, make sure the ntp package is installed:
 
 ```sh
@@ -35,6 +37,31 @@ As of CentOS 8, `ntp` is no longer available and has been replaced by `chrony`.
 $ sudo yum install -y chrony
 ```
 
+### PHC (PTP Hardware Clock) {{<tags/feature/tp>}}
+
+PTP Hardware Clock (PHC) refers to a physical clock device that supports the [Precision Time Protocol (PTP)](https://en.wikipedia.org/wiki/Precision_Time_Protocol) which is a network protocol used for highly accurate time synchronization.
+
+To check if your AWS instance supports PHC, see [AWS PTP Hardware Clock](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configure-ec2-ntp.html#connect-to-the-ptp-hardware-clock).
+
+Configure PTP using
+
+```sh
+sudo bash ./bin/configure_ptp.sh
+```
+
+### Clockbound Agent {{<tags/feature/tp>}}
+
+Configuring a clockbound agent improves clock accuracy significantly.
+While PHC is beneficial, it is not required. However, Chrony is a necessary prerequisite.
+
+```sh
+sudo bash ./bin/configure_clockbound.sh
+```
+
+The scripts are packaged in YugabyteDB releases.
+
+Please configure yb-tserver and yb-master with gFlag `time_source=clockbound`.
+
 ## ulimits
 
 In Linux, `ulimit` is used to limit and control the usage of system resources (threads, files, and network connections) on a per-process or per-user basis.