Re: [patch][rfc][rft] vm throughput 2.4.2-ac4

[Mike Galbraith]

On Thu, 1 Mar 2001, Rik van Riel wrote:

> > > The merging at the elevator level only works if the requests sent to
> > > it are right next to each other on disk. This means that randomly
> > > sending stuff to disk really DOES DESTROY PERFORMANCE and there's
> > > nothing the elevator could ever hope to do about that.
> >
> > True to some (very real) extent because of the limited buffering
> > of requests.  However, I can not find any useful information
> > that the vm is using to guarantee the IT does not destroy
> > performance by your own definition.
>
> Indeed. IMHO we should fix this by putting explicit IO
> clustering in the ->writepage() functions.

I notice there's a patch sitting in my mailbox.. think I'll go read
it and think (grunt grunt;) about this issue some more.

Thanks for the input Rik.  I appreciate it.

	-Mike