svn commit: r222410 - in stable/8/sys: modules/khelp modules/khelp/h_ertt netinet/khelp

Lawrence Stewart lstewart at
Sat May 28 08:24:23 UTC 2011

Author: lstewart
Date: Sat May 28 08:24:22 2011
New Revision: 222410

  MFC 217806:
  Import the ERTT (Enhanced Round Trip Time) Khelp module. ERTT uses the
  Khelp/Hhook KPIs to hook into the TCP stack and maintain a per-connection, low
  noise estimate of the instantaneous RTT. ERTT's implementation is robust even in
  the face of delayed acknowledgements and/or TSO being in use for a connection.
  A high quality, low noise RTT estimate is a requirement for applications such as
  delay-based congestion control, for which we will be importing some algorithm
  implementations shortly.
  In collaboration with:	David Hayes <dahayes at swin edu au> and
  				Grenville Armitage <garmitage at swin edu au>
  Sponsored by:	FreeBSD Foundation
  Reviewed by:	bz and others along the way

     - copied from r217806, head/sys/modules/khelp/h_ertt/
     - copied from r217806, head/sys/netinet/khelp/
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/modules/khelp/Makefile
--- stable/8/sys/modules/khelp/Makefile	Sat May 28 08:20:25 2011	(r222409)
+++ stable/8/sys/modules/khelp/Makefile	Sat May 28 08:24:22 2011	(r222410)
@@ -1,5 +1,5 @@
 # $FreeBSD$
+SUBDIR=	h_ertt
 .include <>

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