LPM Trie multibit #10171
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LPM Trie multibit #10171
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Matching on 1 bit produces a binary tree structure such that when densely populated for 32bit prefixes, creates a tree with a height of at most 32. We have found that this introduces significant cache miss opportunity, thus slowing down lookup performance. Improve this by cutting the height of the tree to 8 given the same scenario. While the memory footprint increases for sparsely populated trees, the max memory uses for a densely populated trie remains about the same. Suggested-by: Jesper Dangaard Brouer <[email protected]> (Cloudflare) Suggested-by: Matt Fleming <[email protected]> (Cloudflare) Signed-off-by: Frederick Lawler <[email protected]>
Separate documentation from previous commit for separate review comments. Squash in final merge. Signed-off-by: Frederick Lawler <[email protected]>
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