My early flush patch, posted a month or so ago, takes care of this nicely.
I'm just waiting for 2.5 to roll around to do some more work on it.
> [...]
> Could anybody produce any real figures to prove/disprove my theory? Could
> anybody benchmark the disk access for the 3 waiting times (0, 200ms 30sec) with
> different loads?
Your theory is correct. I implemented the idea, took measurements, and found
dramatic performance improvements under some loads, while getting worse on
none. You can search lwn.net for a nice writeup by Jonathan Corbett.
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