Use of PTPd on RedHat/CentOS

Question

I need to create a reliable and accurate synchronization between two CentOS 6 machines connected through a direct Ethernet connection.

I've seen that on Linux several implementation of the IEEE 1588 Precision Time Protocol (PTP) exist:

PTPd:
- Apparently, this is the original implentation
- Apparently, it is still maintained
PTPd2:
- A new version meant to supersede the previous implementation
- Apparently unmaintained
- For CentOS 6, available only in the EPEL repositories
PTPv2d:
- A further implementation
- Unmaintained as well
linuxptp:
- A specific implementation for Linux
- Maintained
- Available on the CentOS repositories
- Suggested by the RedHat documentation for both RedHat 6 and RedHat 7

My questions follow:

Why does the RedHat documentation suggest the use of linuxptp for RedHat 6 (based on Linux kernel 2.6) despite the linuxptp documentation says that a Linux kernel version 3.0 or newer is needed ?
Which are differences between PTPd2 and Linuxptp in terms of reliability and timing accuracy ?

There are too many questions in one and is all overly broad. Please try to narrow down your question and be more specific, if you want to get good answer. — Diamond, Jan 18 '16 at 09:58
You are surely aware that Red Hat routinely backports kernel features and patches from newer kernels? [So they did for RHEL 6.4](https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.4_Release_Notes/kernel.html), in which linuxptp was introduced. — Michael Hampton, Jan 18 '16 at 15:10
Yes, I *supposed* it. What about the differences between linuxptp and PTPd2 ? — Claudio, Jan 18 '16 at 15:11

0 Answers0