Possible Duplicate:
Mysql Memory table getting many locks

on my site I log every pageview (date,ip,referrer,page,etc) in a simple mysql table.

This table gets very little selects (3 per minute), but a lot of inserts. (about 100 per second)

Today I changed this table from an InnoDB table to a MEMORY table, this made sense to me to prevent unnecessary hard disk IO. I also prune this table once per minute, to make sure it never get's too big.

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Performance wise, things are running fine. But I noticed that while running tuning-primer, that my Current Lock Wait ratio is quite high.

Current Lock Wait ratio = 1 : 561

My question: Should I worry about this Lock Wait Ratio? And is there something I can change in my my.cnf to improve things so that the lock wait ratio isn't so high?