Re: Anticipatory disk scheduling - soc 2008

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Nirmal Thacker wrote:
> I thought of exactly the same thing (except I was not sure where to
> add this)since I assume that the scheduler which I write should be
> accessbile as an interface (hence add an API) rather than plugging it
> into the NATA driver. However this would require me to modify (would
> it?) calls in the nata code - is this OK?

Sure thing.  I think eventually all disk drivers which have latency due to 
seeks would use this API.

> >    This would allow you to test your scheduler with a vkernel by also having
> >    the VKD driver call it (/usr/src/sys/dev/virtual/disk).
>
> Im not sure of what I understand about the vkernel. Is this a common
> feature in BSD systems or only the DragonflyBSD? Could I have more
> information (or hyperlinks) to this and how it is important or can
> help me in testing my scheduler, as you mention above.

This is D-d-d-dragonFly exlusive(-ive-ive-ive)!  Have a look at vkernel(7).

cheers
  simon

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