Thus spake Paul Robinson <[EMAIL PROTECTED]>:
> Hiten Pandya wrote:
>
> > Hello gang.
> >
> > Does anyone know what kind of `Disk Scheduling' algorithm,
> > if any, is used in FreeBSD?
>
> I'm assuming you've read this recently then:
>
> http://www.kerneltrap.org/node-592.html
...
> Anybody else got plans on this? I need to have a proper look around the
> source tree, but I think this would be both self-contained (i.e. easy to
> back out if it breaks) and useful. Quite a small-ish project really as well.
The original anticipatory scheduler implementation was done for
FreeBSD 4.3. See
http://www.cs.rice.edu/~ssiyer/r/antsched/
I haven't looked carefully at it myself; I've only heard about it
through someone who knows Margo Seltzer. It looks very
interesting, although I worry that it would interfere with the
prefetching and sequential heuristics that the VM system already
does (which are already VERY good[1]). Maybe the authors already
thought of that issue and addressed it. So in short, I don't know
much about it, but I think it's worth looking into.
[1] The fact that the improvement Linux got out of the new
approach was so much greater than the improvement FreeBSD 4.3
got out of it is a testament to that fact, I think.
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