From bd79708dbffde195226ade494aa72c345328e745 Mon Sep 17 00:00:00 2001 From: "Jonathan T. Looney" Date: Wed, 12 Oct 2016 02:16:42 +0000 Subject: In the TCP stack, the hhook(9) framework provides hooks for kernel modules 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 --- UPDATING | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'UPDATING') diff --git a/UPDATING b/UPDATING index 970401bff532..b6e6bf61eaa0 100644 --- a/UPDATING +++ b/UPDATING @@ -31,6 +31,11 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 12.x IS SLOW: disable the most expensive debugging functionality run "ln -s 'abort:false,junk:false' /etc/malloc.conf".) +20161008: + Use of the cc_cdg, cc_chd, cc_hd, or cc_vegas congestion control + modules now requires that the kernel configuration contain the + TCP_HHOOK option. (This option is included in the GENERIC kernel.) + 20161003: The WITHOUT_ELFCOPY_AS_OBJCOPY src.conf(5) knob has been retired. ELF Tool Chain's elfcopy is always installed as /usr/bin/objcopy. -- cgit v1.3