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[IPV4]: Move FIB lookup algorithm choice under IP_ADVANCED_ROUTING

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Most users need not be concerned with a complex choice of what
FIB lookup algorithm to use.  So give them the safe default of
IP_FIB_HASH if IP_ADVANCED_ROUTING is disabled.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2005-06-24 17:50:53 -07:00
parent f7704347a7
commit bb298ca3ce
1 changed files with 38 additions and 26 deletions
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64
net/ipv4/Kconfig
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@ -1,32 +1,6 @@
#
# IP configuration
#
choice
prompt "Choose IP: FIB lookup"
depends on INET
default IP_FIB_HASH
config IP_FIB_HASH
bool "FIB_HASH"
---help---
Current FIB is very proven and good enough for most users.
config IP_FIB_TRIE
bool "FIB_TRIE"
---help---
Use new experimental LC-trie as FIB lookup algoritm.
This improves lookup performance
LC-trie is described in:
IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson
IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, June 1999
An experimental study of compression methods for dynamic tries
Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002.
http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/
endchoice
config IP_MULTICAST
bool "IP: multicasting"
depends on INET
@ -79,6 +53,44 @@ config IP_ADVANCED_ROUTER
If unsure, say N here.
choice
prompt "Choose IP: FIB lookup algorithm (choose FIB_HASH if unsure)"
depends on IP_ADVANCED_ROUTER
default IP_FIB_HASH
config IP_FIB_HASH
bool "FIB_HASH"
---help---
Current FIB is very proven and good enough for most users.
config IP_FIB_TRIE
bool "FIB_TRIE"
---help---
Use new experimental LC-trie as FIB lookup algoritm.
This improves lookup performance if you have a large
number of routes.
LC-trie is a longest matching prefix lookup algorithm which
performs better than FIB_HASH for large routing tables.
But, it consumes more memory and is more complex.
LC-trie is described in:
IP-address lookup using LC-tries. Stefan Nilsson and Gunnar Karlsson
IEEE Journal on Selected Areas in Communications, 17(6):1083-1092, June 1999
An experimental study of compression methods for dynamic tries
Stefan Nilsson and Matti Tikkanen. Algorithmica, 33(1):19-33, 2002.
http://www.nada.kth.se/~snilsson/public/papers/dyntrie2/
endchoice
# If the user does not enable advanced routing, he gets the safe
# default of the fib-hash algorithm.
config IP_FIB_HASH
bool
depends on !IP_ADVANCED_ROUTER
default y
config IP_MULTIPLE_TABLES
bool "IP: policy routing"
depends on IP_ADVANCED_ROUTER