[PATCH/RFC] readahead applet
Rob Landley
rob at landley.net
Mon Aug 21 18:17:09 UTC 2006
On Monday 21 August 2006 1:00 pm, Paul Fox wrote:
> >
> > With our new "readahead" command, everything is done in one system call.
> > So, almost everything is done in kernel mode, possibly in an optimized
> > way between the filesystem and page cache. And of course, no buffer copy
> > from kernel-space to user-space is done!
> >
> > To prove this I ran "time readahead" and "time cat" on 2 identical files.
>
> what's the result if you compare with "time dd bs=<some large number>" ?
In a low-memory environment do you really want dd to malloc <some large
number> and touch every page in it?
Rob
--
Never bet against the cheap plastic solution.
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