Re: I/O Request [Elevator; Clustering; Scatter-Gather]

From: Jens Axboe (axboe@suse.de)
Date: Tue Mar 04 2003 - 09:20:41 EST

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On Tue, Mar 04 2003, Daniel Phillips wrote:
> On Tuesday 04 March 2003 14:50, Jens Axboe wrote:
> > > Do Clustering of request and scatter-gather mean the same ?? Confused
> > > to the core... Kindly help me ...
> >
> > No, the elevator clustering refers to clustering request that are
> > contigious on disk. Scatter-gather may cluster sg entries that are
> > contigious in memory.
>
> Hi Jens,
>
> I think you meant to write *non*contiguous in memory (but contiguous on the
> device).

No I didn't. Well actually both may happen, depending on your hardware.
What I wrote covers basic x86 hardware.

-- Jens Axboe

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