Why there are two different kernel clock sources between Red Hat Enteprise Linux 5 and Red Hat Enterpise Linux 6 on a Rouzic boards

Solution Unverified - Updated -

Issue

After upgrading Rouzic boards to Red Hat Enterprise Linux 6, a clock drift using ntpdate -q is noticed.
What could be the reason of this shift?
How to decrease this drift?
What is the algorithm applied on Red Hat Enterprise Linux 6 to find clock sources and select one?

Environment

Red Hat Enterprise Linux 6.3

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