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From: "James Stevenson" <mail-lists@stev.org>
To: "Roy Sigurd Karlsbakk" <roy@karlsbakk.net>,
        "Marcelo Tosatti" <marcelo@conectiva.com.br>
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Subject: Re: /proc/sys/vm/(max|min)-readahead effect????
Date: Wed, 5 Dec 2001 19:43:57 -0000
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> > Basically you cannot simply expect an increase in readahead size to
> > increase performance:
> >
> > 1) The files you created may not be sequential
>
> Beleive me - they are! Created with 'dd' secuentially

thats still does not mean they are sequential creating
large files almost always causes them to fragment.

Actually does anyone know of an easy way to find out
if certin files are fragmented and by how much ?




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