1st, that isn't really going to do anything as the CKCL perfmon log you see there isn't the same one creating the bootckcl.etl file (just look at the properties of it
), so disabling that isn't going to get you anywhere. Second, the log should stop when the machine is "idle", which should be about 7-10 seconds of little CPU and disk activity.
The real curious bit is why isn't the machine hitting idle or timing out the log? I've never heard of this before, although I suppose anything is possible. Let me ping some people who are far smarter than me about what they think about this - in the meantime, can you gather / upload a boot trace as per this tutorial