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The txtimestamp selftest sets a fixed 500us tolerance. This value was arrived at experimentally. Some platforms have higher variances. Make this adjustable by adding the following flag: -t N: tolerance (usec) for timestamp validation. Signed-off-by: Jian Yang <jianyang@google.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>