good point, so the idea would be to supply something like:

page.php?x=1&y=1...

where the x and y keys are going to have the same hash value, so that when it uses those vars in a page it will hit the same hash bucket and become O(n) not O(1)?

Of course you would want to send a lot of different vars in.

Yup, though I'd probably pass those in using a POST request. A 5,000,000 character long log entry sticks out a bit, and most people aren't logging POST params by default.