How to partition my table

[Maron Vomr@]

HI all,
I am new to partitioning in mysql and willing to know how to partition my following table with structure as below:

logdate datime not null default '0000-00-00 00:00:00',
ip varchar(15) not null,
size decimal(20,2) unsigned not null default '0.00'
url text not null,
user varchar(25) not null default '',
mime char(15) default null,
extension char(10) not null default '',
PRIMARY KEY(logdate,user)


Which stores logs of proxy around 1GB per day. Now how to break down this table with partitioning.

Thank you.