I'm not certain it's your problem, but the man page shows it as "size 100M", without the "="...
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I do actually see it both with the = and without for an out of the box CentOS 5.3 system, so I think both work. It might be more of an issue of, daily, the logrotate program is ran, and if when it checks the logs, they are larger than the given size, then it rotates them. This gives the varying sizes that you see, due to the fact it does not check every minute, but once a day.
Last edited by Jonathan Kinney; 06-23-2009 at 02:16 PM.