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authorDinesh Dutt <ddutt@cumulusnetworks.com>2012-12-04 10:46:37 -0800
committerScott Feldman <sfeldma@cumulusnetworks.com>2013-01-07 09:59:43 -0800
commit91e6a0e5ca973c7183f638987b67aa370e9b484c (patch)
tree734c8c74baaaa6d3c303928b4f6d1d35d3394115 /ospf6d/.gitignore
parent4ba4fc857685bfe31c7127826652012a750367c5 (diff)
ospf: Convert MAX_AGE LSA list to tree
Store the MaxAge LSA list in a tree instead of a linked list for efficient access. Walking the list can be quite inefficient in some large systems and under certain tests. ospfd maintains the list of LSA's that have been MaxAge'd out in a separate linked list for removal by a remover/walker thread. When a new LSA is to be installed, the old LSA is ejected and when it is ejected, the MaxAge LSA list is traversed to ensure that the old LSA is also removed from this list if it exists on this list. When a large number (> 5K) MaxAge LSAs are bombarding the system, walking this list takes a significant time causing timers to fire and actions to be taken such as expiring neighbors due to expiry of DeadInterval (especially when timer is really low, <= 12s), creating a spiral of instability. By making this MaxAge LSA list be a tree, this problem is mitigated. Signed-off-by: Dinesh Dutt <ddutt@cumulusnetworks.com> Reviewed-by: Ayan Banerjee <ayan@cumulusnetworks.com> Reviewed-by: Scott Feldman <sfeldma@cumulusnetworks.com> Reviewed-by: Shrijeet Mukherjee <shm@cumulusnetworks.com> Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
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