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author | Jonathan T. Looney <jtl@FreeBSD.org> | 2016-10-12 02:16:42 +0000 |
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committer | Jonathan T. Looney <jtl@FreeBSD.org> | 2016-10-12 02:16:42 +0000 |
commit | bd79708dbffde195226ade494aa72c345328e745 (patch) | |
tree | 1b79edfb878106737ae2b44a56f602aa596ac1df /sys/arm/conf/CRB | |
parent | 368bf0c2c6b2ddf304cc0463ae162399a706117b (diff) | |
download | src-bd79708dbffde195226ade494aa72c345328e745.tar.gz src-bd79708dbffde195226ade494aa72c345328e745.zip |
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
Notes
Notes:
svn path=/head/; revision=307082
Diffstat (limited to 'sys/arm/conf/CRB')
-rw-r--r-- | sys/arm/conf/CRB | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/arm/conf/CRB b/sys/arm/conf/CRB index c5d6cdf3a2ed..3970c551e78a 100644 --- a/sys/arm/conf/CRB +++ b/sys/arm/conf/CRB @@ -34,6 +34,7 @@ options HZ=100 options SCHED_4BSD # 4BSD scheduler options INET # InterNETworking options INET6 # IPv6 communications protocols +options TCP_HHOOK # hhook(9) framework for TCP options FFS # Berkeley Fast Filesystem options SOFTUPDATES # Enable FFS soft updates support options UFS_ACL # Support for access control lists |