how can the kernel know when the application has finished submitting a bunch of requests?
or is it that the application submits one request, but something in the kernel is breaking it into a bunch of requests that all get submitted at once, and plugging is an attempt to allow the kernel to recombine them? (but that doesn't match your comment about sorting 3 non-adjacent requests being a win, how can one action by an application generate 3 non-adjacent requests?)
I'm obviously missing something here.
if the application is doing multiple read/write commands, I don't see how the kernel can possibly know how soon the next activity will be submitted after each command is run.
if the application is doing something with a single command, it seems like the problem is that it shouldn't be broken up to begin with, so there would be no need to plug to try and combine them
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