It is documented. ping(8) (3:20101006-1ubuntu1 from 12.04LTS) says:
| If the data space is at least of size of struct timeval ping uses the
| beginning bytes of this space to include a timestamp which it uses in
| the computation of round trip times. If the data space is shorter, no
| round trip times are given.
** Changed in: iputils (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1004350
Title:
Ping does not show roundtrip time (64bit issue)
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