Merge r206972 from head to stable/8:

Merge r206972 from head to stable/8:

  Merge @176820, @176822, @177156 to tcpp from P4 to HEAD:

   Improve accuracy of connection data transfer math.

   Disable Nagle's algorithm to avoid delaying transfers of data --
   will want to refine this to combine payload with header transfer,
   however.

   Now that we're running w/o Nagle, try to send the initial data
   burst with the header in a single TCP segment.

   Prefer %zu to %ju for size_t.

   Sponsored by:	Juniper, Inc.

Approved by:	re (bz)

git-svn-id: svn://svn.freebsd.org/base/stable/8@208701 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f