DLPX-25998 TCP congestion control is inadequate
Reviewed at: http://reviews.delphix.com/r/34808/

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  #
  
  #
  # Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  # Copyright (c) 2013 Andrew Stormont.  All rights reserved.
+ # Copyright (c) 2015, 2017 by Delphix. All rights reserved.
  # Copyright (c) 2015, Joyent, Inc. All rights reserved.
  # Copyright 2016 Gary Mills
  # Copyright 2016 Nexenta Systems, Inc.
  #
  
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  #
  #       Collect the preprocessor definitions to be associated with *all*
  #       files.
  #
  ALL_DEFS         = $(MACHINE_DEFS) $(DEBUG_DEFS) $(OPTION_DEFS)
+ 
  #
+ #       TCP congestion control modules (/kernel/cc)
  #
+ CC_KMODS       += cc_newreno cc_cubic cc_sunreno
+ 
+ #
+ #
  #       The kernels modules which are "implementation architecture"
  #       specific for this machine are enumerated below. Note that most
  #       of these modules must exist (in one form or another) for each
  #       architecture.
  #