[IPV4] fib_trie: avoid rescan on dump

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This converts dumping (and flushing) of large route tables form O(N^2)
to O(N). If the route dump took multiple pages then the dump routine
gets called again. The old code kept track of location by counter, the
new code instead uses the last key.

This is a really big win ( 0.3 sec vs 12 sec) for big route tables.

One side effect is that if the table changes during the dump, then the
last key will not be found, and we will return -EBUSY.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Stephen Hemminger 2008-01-22 21:57:22 -08:00 • committed by David S. Miller

parent 9195bef7fb

commit d5ce8a0e97

1 changed files with 21 additions and 13 deletions

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net/ipv4/fib_trie.c

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