Re: /proc/sys/vm/(max|min)-readahead effect????

From: Rik van Riel (riel@conectiva.com.br)
Date: Wed Dec 05 2001 - 13:22:38 EST

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On Wed, 5 Dec 2001, Marcelo Tosatti wrote:
> On Wed, 5 Dec 2001, Roy Sigurd Karlsbakk wrote:
>
> > I've just upgraded to 2.4.16 to get /proc/sys/vm/(max|min)-readahead
> > available. I've got this idea...
> >
> > If lots of files (some hundered) are read simultaously, I waste all the
> > i/o time in seeks. However, if I increase the readahead, it'll read more
> > data at a time, and end up with seeking a lot less.
>
> Do you also have VM pressure going on or do you have lots of free memory ?

I suspect the per-device readahead for IDE is limiting the
effect of vm_max_readahead ...

Rik

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