On 08/15/2012 03:08 AM, Eric W. Biederman wrote: >> I can offer the following: I'll write a small module that will hash 1...10000 >> > into a hashtable which uses 7 bits (just like user_ns) and post the distribution >> > we'll get. > That won't hurt. I think 1-100 then 1000-1100 may actually be more > representative. Not that I would mind seeing the larger range. > Especially since I am in the process of encouraging the use of more > uids. > Alrighty, the results are in (numbers are objects in bucket): For the 0...10000 range: Average: 78.125 Std dev: 1.4197704151 Min: 75 Max: 80 For the 1...100 range: Average: 0.78125 Std dev: 0.5164613088 Min: 0 Max: 2 For the 1000...1100 range: Average: 0.7890625 Std dev: 0.4964812206 Min: 0 Max: 2 Looks like hash_32 is pretty good with small numbers. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
