[Exim] fsync and a subject for the wish list

Hello,

by now I experimented by not using fsync() and I can say to everybody's
relief that it does not help much. The number of disk transactions
decreases and disk traffic decreases some, but I could not see an effect
concerning the average queue size or CPU usage, which should decrease
if mails pass through quicker. Obviously I did not optimise a bottle
neck by removing fsync. This is on Linux 2.2.5.

I have one item for the Exim wishlist, though: Please log e.g. all
10 minutes how much CPU time Exim and its children spent in user and
system mode during those 10 minutes, best expressed as percentage of
the interval.

It is trivial to do so by subtracting the previous times(2) result from
the current one using using the time(2) result to compute percentages
and the values are helpful if you wonder where CPU time goes on a system
with many different daemons.

Michael