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RHEL 6 commit 5919674a6330e8e68f225f1d2b663b4c2849049d which went into the in 2.6.32-90.el6 kernel backports upstream patch 

commit 0715dc632a271fc0fedf3ef4779fe28ac1e53ef4
Author: Bryan Schumaker <bjschuma>
Date:   Fri Sep 24 18:50:01 2010 -0400

    NFS: remove readdir plus limit
    
    We will now use readdir plus even on directories that are very large.
    
    Signed-off-by: Bryan Schumaker <bjschuma>
    Signed-off-by: Trond Myklebust <Trond.Myklebust>

This is a change in behaviour when compared to the RHEL 6 GA kernel.

Problems resulting from this change have been reported upstream at
http://thread.gmane.org/gmane.linux.nfs/39392

Creating bz to track this issue for RHEL 6.

Since RHEL 6.2 External Beta has begun, and this bug remains
unresolved, it has been rejected as it is not proposed as
exception or blocker.

Red Hat invites you to ask your support representative to
propose this request, if appropriate and relevant, in the
next release of Red Hat Enterprise Linux.