Re: [PATCH 02/16] user_ns: use new hashtable implementation

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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.
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Filesystem Development]     [Linux USB Development]     [Linux Media Development]     [Video for Linux]     [Linux NILFS]     [Linux Audio Users]     [Yosemite Info]     [Linux SCSI]

  Powered by Linux