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bird/sysdep/cf
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Maria Matejka 9d03c3f56c Memory pages are not munmapped, instead we just madvise() 
Memory unmapping causes slow address space fragmentation, leading in
extreme cases to failing to allocate pages at all. Removing this problem
by keeping all the pages allocated to us, yet calling madvise() to let
kernel dispose of them.

This adds a little complexity and overhead as we have to keep the
pointers to the free pages, therefore to hold e.g. 1 GB of 4K pages with
8B pointers, we have to store 2 MB of data.
2022-11-02 12:56:54 +01:00
..
bsd.h Build system reworked to one global Makefile with includes and no nesting 2016-05-10 14:07:34 +02:00
linux.h Memory pages are not munmapped, instead we just madvise() 2022-11-02 12:56:54 +01:00
README KRT: Scan routing tables separetely on linux to avoid congestion 2022-07-24 02:15:20 +02:00

README 

Available configuration variables:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

CONFIG_AUTO_ROUTES	Device routes are added automagically by the kernel
CONFIG_SELF_CONSCIOUS	We're able to recognize whether route was installed by us
CONFIG_MULTIPLE_TABLES	The kernel supports multiple routing tables
CONFIG_SINGLE_ROUTE	There is only one route per network

CONFIG_MC_PROPER_SRC	Multicast packets have source address according to socket saddr field
CONFIG_SKIP_MC_BIND	Don't call bind on multicast socket (def for *BSD)
CONFIG_NO_IFACE_BIND	Bind to iface is not available, use workarounds (def for *BSD)
CONFIG_UNIX_DONTROUTE	Use setsockopts DONTROUTE (undef for *BSD)
CONFIG_DONTROUTE_UNICAST Use MSG_DONTROUTE flag for unicast packets (def for FreeBSD)
CONFIG_USE_HDRINCL	Use IP_HDRINCL instead of control messages for source address on raw IP sockets.

CONFIG_RESTRICTED_PRIVILEGES	Implements restricted privileges using drop_uid()