mirror/labs-bird
1
0
Fork 0
mirror of https://gitlab.labs.nic.cz/labs/bird.git synced 2024-05-11 16:54:54 +00:00
Code Releases Activity

New hash functions according to benchmarks posted yesterday. (The IPv6

Browse Source 
version has not been benchmarked yet due to insufficient test data.)
Now ipa_hash() returns a uniformely distributed 16-bit value.
This commit is contained in:
Martin Mares
1998-12-20 13:57:49 +00:00
parent a05406e69c
commit a6f250f5c6
2 changed files with 5 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
lib/ipv4.h
View File

@@ -61,10 +61,12 @@ typedef u32 ip_addr;
int ipv4_classify(u32);
u32 ipv4_class_mask(u32);
/* FIXME: Is this hash function uniformly distributed over standard routing tables? */
static inline unsigned ipv4_hash(u32 a)
{
return a ^ (a >> 16) ^ (a >> 24);
/* Returns a 16-bit value */
a ^= a >> 16;
a ^= a << 10;
return a & 0xffff;
}
#endif