Why writing file from RHEL 6.6 on NFSv4 taking long time in utimensat call?

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Issue

Why writing file on NFS share from RHEL 6 NFS Client is taking more time in comparison to RHEL 5.5 ?
Why utimensat() call in RHEL 6 is taking more time while the same is not present in RHEL 5.5 ?

Environment

Red Hat Enterprise Linux 6 (NFS Client)
NetApp Model FAS3250 / ONTAP version 8.2.3P5 cluster mode (NFS Server)

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