Changes in Makefile

bd79708d - In the TCP stack, the hhook(9) framework provides hooks for kernel modules

Wed, 12 Oct 2016 02:16:42 +0000

In the TCP stack, the hhook(9) framework provides hooks for kernel modulesto add actions that run when a TCP frame is sent or received on a TCPsession in the ESTABLISHED state. In the base tree, this functionality isonly 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 issent or received on an ESTABLISHED TCP session.This change adds a new compile-time option (TCP_HHOOK) to determine whetherto include the hhook(9) framework for TCP. To retain backwardscompatibility, I added the TCP_HHOOK option to every configuration file thatalready defined "options INET". (Therefore, this patch introduces nofunctional change. In order to see a functional difference, you need tocompile a custom kernel without the TCP_HHOOK option.) This change willallow users to easily exclude this functionality from their kernel, shouldthey wish to do so.Note that any users who use a custom kernel configuration and use one of thecongestion control modules listed above will need to add the TCP_HHOOKoption to their kernel configuration.Reviewed by: rrs, lstewart, hiren (previous version), sjg (makefiles only)Sponsored by: NetflixDifferential Revision: https://reviews.freebsd.org/D8185 List of files: /freebsd-13.1/sys/modules/khelp/Makefile

050570ef - Import the ERTT (Enhanced Round Trip Time) Khelp module. ERTT uses the

Mon, 24 Jan 2011 23:08:38 +0000

Import the ERTT (Enhanced Round Trip Time) Khelp module. ERTT uses theKhelp/Hhook KPIs to hook into the TCP stack and maintain a per-connection, lownoise estimate of the instantaneous RTT. ERTT's implementation is robust even inthe 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 asdelay-based congestion control, for which we will be importing some algorithmimplementations shortly.In collaboration with: David Hayes and Grenville Armitage Sponsored by: FreeBSD FoundationReviewed by: bz and others along the wayMFC after: 3 months List of files: /freebsd-13.1/sys/modules/khelp/Makefile

6987b09f - Add build infrastructure for Khelp modules.

Mon, 24 Jan 2011 07:50:29 +0000

Add build infrastructure for Khelp modules.Sponsored by: FreeBSD FoundationReviewed by: bzMFC after: 3 months List of files: /freebsd-13.1/sys/modules/khelp/Makefile