Re: sysctl defaults

Garst R. Reese (reese@isn.net)
Mon, 30 Mar 1998 14:41:20 -0400

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Rik van Riel wrote:
>
> On Mon, 30 Mar 1998, Garst R. Reese wrote:
>
> > With the growing number of sysctl options, it seems to me that one could
> > make some rather disastrous errors trying to tune the kernel.
> > A shell script that would restore everything to the defaults would be
> > quite useful, along with a boot option to do the same. The shell script
> > could contain comments to explain the options as well.
>
> The documentation you need is in linux/Documentation/sysctl...
>
> succes,
>
> Rik.
Yes, I read that. Great info for hackers. Now, bdflush has 9 parameters,
my swapping behavior truly sucks with my 20Mb Laptop and the only way I
can change that is buy a new one :(.
I try cat "40 500 64 256 15 30*HZ 5*HZ 1884 2" > /proc/sys/vm/bdflush ??
except changing something. Now I make a typo and crash my system. How do
I recover.
I think we need some sysctl utilities that prove some sanity checks and
some info that says "If you have a gig of mem you might like this"
"If you have only 8Mb try this".
At the very least, I think concrete examples of how to do things would
be a large benefit in Linux/Unix docs as xxxix displaces M$ :)
I'm attaching the sh script that Adam Heath so kindly sent to me.
(Credit added by me). Thanks Adam
Thanks Rik

-- 
Garst
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#!/bin/sh
# Contributed by Adam Heath adam.heath@usa.net
sdir=/procsave
pdir=/proc/sys
function doit(){
	echo $*
	eval $*
}
if [ ! -d "$sdir" ];then
	doit mkdir $sdir
fi
case "$1" in
	"save")
		rm $sdir/* -r
		cd $pdir
		for dir in `find -type d ! -name .` ;do
			doit mkdir $sdir/$dir
		done
		for file in `find -type f ! -name .` ;do
			doit cp $pdir/$file $sdir/$file 
		done
		;;
	"restore")
		cd $pdir
		for file in `find -type f ! -name .` ;do
			if [ -e $sdir/$file ];then
				doit cp $sdir/$file $pdir/$file 2>/dev/null
			fi
		done
		;;
esac






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