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Add compile-time option to enable 4-way tries instead of 16-way ones

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In some cases 16-way tries are too memory-heavy, while 4-way are
almost as efficient as the original 2-way ones.
This commit is contained in:
Ondrej Zajicek 2023-01-02 15:55:55 +01:00
parent 6d1ae197d1
commit d3f50ede12
2 changed files with 18 additions and 0 deletions
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11
configure.ac
View File

@ -36,6 +36,12 @@ AC_ARG_ENABLE([memcheck],
[enable_memcheck=yes]
)
AC_ARG_ENABLE([compact-tries],
[AS_HELP_STRING([--enable-compact-tries], [use 4-way tries instead of 16-way ones @<:@no@:>@])],
[],
[enable_compact_tries=no]
)
AC_ARG_ENABLE([pthreads],
[AS_HELP_STRING([--enable-pthreads], [enable POSIX threads support @<:@try@:>@])],
[],
@ -409,6 +415,10 @@ if test "$enable_debug" = yes ; then
fi
fi
if test "$enable_compact_tries" = yes ; then
AC_DEFINE([ENABLE_COMPACT_TRIES], [1], [Define to 1 if you want 4-way tries instead of 16-way ones.])
fi
CLIENT=birdcl
CLIENT_LIBS=
if test "$enable_client" = yes ; then
@ -469,6 +479,7 @@ AC_MSG_RESULT([ Object directory: $objdir])
AC_MSG_RESULT([ Iproute2 directory: $iproutedir])
AC_MSG_RESULT([ System configuration: $sysdesc])
AC_MSG_RESULT([ Debugging: $enable_debug])
AC_MSG_RESULT([ Compact tries: $enable_compact_tries])
AC_MSG_RESULT([ POSIX threads: $enable_pthreads])
AC_MSG_RESULT([ Routing protocols: $protocols])
AC_MSG_RESULT([ LibSSH support in RPKI: $enable_libssh])

7
filter/data.h
View File

@ -141,8 +141,15 @@ struct f_tree {
void *data;
};
#ifdef ENABLE_COMPACT_TRIES
/* Compact 4-way tries */
#define TRIE_STEP 2
#define TRIE_STACK_LENGTH 65
#else
/* Faster 16-way tries */
#define TRIE_STEP 4
#define TRIE_STACK_LENGTH 33
#endif
struct f_trie_node4
{