David S. Miller writes: > How did you "rip it out"? Just never look into the routing > cache hash and never add entries there? If so, then yes it is > excellent simulation for pure slow path. Look at the patch... hash lookup is bypassed -> always slow path. no lookup in rt_intern_hash but we keep the entry in the hash and ip_rt_dst_alloc is changed to run do __rt_hash_shrink for each call. > This is not purely an algorithmic problem. The highest cost thing we > do in the slow path of input route processing is source validation. > This requires real brains to eliminate. > > Actually, that's a good idea, if someone if brave just rip out > fib_validate_source (just don't call it, should work for valid > traffic) and see what happens :) It should be easy to do... Cheers. --ro - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
