[Codel] [Bloat] found another good use for a queue today, possibly

Dave Taht dave at taht.net
Wed Nov 28 23:37:52 EST 2018

Jonathan Morton <chromatix99 at gmail.com> writes:

>>> "polylog(n)-wise Independent Hash Function". OK, my google-foo fails
>>> me: The authors use sha1, would something lighter weight suit?
>> The current favorite in DPDK land seems to be Cuckoo hashing.
>> It has better cache behavior than typical chaining.
> That paper describes an improved variant of cuckoo hashing, using a
> queue to help resolve collisions with better time complexity.  The
> proof relies on (among other things) a particular grade of hash
> function being used.  SHA1 is described as being suitable since it
> offers cryptographic-level performance… We actually need two hashes
> with independent behaviour on the same input, one for each table.
> If we were to assume table sizes up to 64K, using both halves of a
> good 32-bit hash might be suitable.  It may be that plain old Jenkins
> hash would work in that context.  Supplement that with a 64-entry
> queue with linear search (in software) or constant-time CAM search (in
> hardware).

I was aiming for 2million routes.

I gave up trying to wade through it and pinged the authors.

fiddling with blake at the moment

>  - Jonathan Morton
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