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authorRoland Dreier <rolandd@cisco.com>2008-07-22 14:19:40 -0700
committerRoland Dreier <rolandd@cisco.com>2008-07-22 14:19:40 -0700
commite4044cfc493338cd09870bd45dc646336bb66e9f (patch)
tree2385c18ee6a79393b4e1c5c25ee1f0f980d7da93 /net
parent899698dad72340b562478b8b770317f2f0fe0c09 (diff)
mlx4_core: Keep free count for MTT buddy allocator
MTT entries are allocated with a buddy allocator, which just keeps bitmaps for each level of the buddy table. However, all free space starts out at the highest order, and small allocations start scanning from the lowest order. When the lowest order tables have no free space, this can lead to scanning potentially millions of bits before finding a free entry at a higher order. We can avoid this by just keeping a count of how many free entries each order has, and skipping the bitmap scan when an order is completely empty. This provides a nice performance boost for a negligible increase in memory usage. Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'net')
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