I've just committed the revised TCP timer code.  There are some 
user visible changes:

  User visible TCP timers are now in units of the system clock
  (10ms for the i386), not those of the slowtimeout (500ms).  So
  if you have customized one of these values, (e.g.: net.inet.tcp.keepintvl),
  you'll need to multiply it appropriately to keep the same interval.

  Also, some new sysctls have been added:

             net.inet.tcp.delacktime: 20
                Specifies the timeout for delayed acks (200ms).
             net.inet.tcp.slowstart_flightsize: 1
                Specifies how many packets are included in the initial
                slow-start flight.  Setting this value to 0 will probably
                result in a non-working system.  Choosing a high value
                would be considered antisocial.
             net.inet.tcp.local_slowstart_flightsize: 65535
                Same as above, but only applies to slowstart on "local"
                networks.  Note that the flightsize is constrained by
                the receiver's advertised window size.
             net.inet.tcp.msl: 3000
                Specifies the "Maximum Segment Lifetime", 30sec.


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