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32db469edf
The number of buckets is calculated by performing a binary AND against
the mask of the hash table, which is one less than its size (which is a
power of two). This leads to all top bits being discarded, requiring
for short or similar inputs a hash function with a good avalanche
effect.
Use djb2a:
# current
common prefixes: 7 entries and 5/8 buckets used, longest chain
length 2, sum of chain length^2 11
classes: 134 entries and 100/256 buckets used, longest chain
length 5, sum of chain length^2 234
roles: 15 entries and 6/16 buckets used, longest chain length 5,
sum of chain length^2 57
types: 4448 entries and 3016/8192 buckets used, longest chain
length 41, sum of chain length^2 14922
users: 7 entries and 3/8 buckets used, longest chain length 3,
sum of chain length^2 17
bools: 306 entries and 221/512 buckets used, longest chain
length 4, sum of chain length^2 524
levels: 1 entries and 1/1 buckets used, longest chain length 1,
sum of chain length^2 1
categories: 1024 entries and 400/1024 buckets used, longest chain
length 4, sum of chain length^2 2740
# patch
common prefixes: 7 entries and 5/8 buckets used, longest chain
length 2, sum of chain length^2 11
classes: 134 entries and 101/256 buckets used, longest chain
length 3, sum of chain length^2 210
roles: 15 entries and 9/16 buckets used, longest chain length 3,
sum of chain length^2 31
types: 4448 entries and 3459/8192 buckets used, longest chain
length 5, sum of chain length^2 6778
users: 7 entries and 5/8 buckets used, longest chain length 3,
sum of chain length^2 13
bools: 306 entries and 236/512 buckets used, longest chain
length 5, sum of chain length^2 470
levels: 1 entries and 1/1 buckets used, longest chain length 1,
sum of chain length^2 1
categories: 1024 entries and 518/1024 buckets used, longest chain
length 7, sum of chain length^2 2992
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: line length fixes in the commit message]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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|---|---|---|
| .. | ||
| include | ||
| ss | ||
| .gitignore | ||
| avc.c | ||
| hooks.c | ||
| ibpkey.c | ||
| ima.c | ||
| Kconfig | ||
| Makefile | ||
| netif.c | ||
| netlabel.c | ||
| netlink.c | ||
| netnode.c | ||
| netport.c | ||
| nlmsgtab.c | ||
| selinuxfs.c | ||
| status.c | ||
| xfrm.c | ||