src-test/sys/modules/khelp, branch main

sys/modules: normalize .CURDIR-relative paths to SRCTOP

2017-03-04T10:10:17Z

This simplifies make output/logic Tested with: `cd sys/modules; make ALL_MODULES=` on amd64 MFC after: 1 month Sponsored by: Dell EMC Isilon

In the TCP stack, the hhook(9) framework provides hooks for kernel modules

2016-10-12T02:16:42Z

to add actions that run when a TCP frame is sent or received on a TCP session in the ESTABLISHED state. In the base tree, this functionality is only used for the h_ertt module, which is used by the cc_cdg, cc_chd, cc_hd, and cc_vegas congestion control modules. Presently, we incur overhead to check for hooks each time a TCP frame is sent or received on an ESTABLISHED TCP session. This change adds a new compile-time option (TCP_HHOOK) to determine whether to include the hhook(9) framework for TCP. To retain backwards compatibility, I added the TCP_HHOOK option to every configuration file that already defined "options INET". (Therefore, this patch introduces no functional change. In order to see a functional difference, you need to compile a custom kernel without the TCP_HHOOK option.) This change will allow users to easily exclude this functionality from their kernel, should they wish to do so. Note that any users who use a custom kernel configuration and use one of the congestion control modules listed above will need to add the TCP_HHOOK option to their kernel configuration. Reviewed by: rrs, lstewart, hiren (previous version), sjg (makefiles only) Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D8185

Remove unnecessary inclusions of bsd.own.mk.

2014-08-04T22:34:12Z

Import the ERTT (Enhanced Round Trip Time) Khelp module. ERTT uses the

2011-01-24T23:08:38Z

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 and Grenville Armitage Sponsored by: FreeBSD Foundation Reviewed by: bz and others along the way MFC after: 3 months

Add build infrastructure for Khelp modules.

2011-01-24T07:50:29Z

Sponsored by: FreeBSD Foundation Reviewed by: bz MFC after: 3 months