[Tutor] a FIFO with fixed capacity?

[Marcus Goldfish]

I need to implement a FIFO with a fixed maximum capacity.  Is there a
name for such a beast?  Also, I read two excellent cookbook recipes on
FIFOs:

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/68436
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/210459

Would limiting the max capacity of the FIFO improve performance by
allowing one to preallocate the FIFO buffer?

All comments appreciated!
Thanks,

Marcus