[ale] linux kernel tuneables ?
jeff hubbs
hbbs at mediaone.net
Wed Dec 19 11:49:47 EST 2001
For enlightenment's sake, what kind of parameters do people modify and
under what circumstances?
- Jeff
Chris Ricker wrote:
> On Wed, 19 Dec 2001, Gene Matthews wrote:
>
>
>>I am trying to figure out where I can tune certain things under linux.
>>Solaris has the /etc/system file where you set values for some kernel
>>parms that are pickep up at boot time. I haven't found (yet) anything
>>similar, although I'm still looking.
>>
>>Can anyone point me in the right direction?
>>
>
> Linux has two interfaces to the exact same kernel parameters, a BSD-sytle
> sysctl(8) and /proc/sys.
>
> sysctl is a command to modify parameters. It can be run directly with the
> parameter to modify (similar to using adb / mdb on the running kernel in
> Solaris), but more typically the parameters are listed in /etc/sysctl.conf
> (similar to /etc/system). sysctl -p will apply that file.
>
> /proc/sys contains files representing the tunable parameters. Values are
> read by catting the files, and are changed by echoing new values into the
> files.
>
> The same parameters are available through either interface. It's just a
> matter of which syntax you prefer. For example,
>
> sysctl -w kernel.sysrq=1
>
> and
>
> echo "1" > /proc/sys/kernel/sysrq
>
> both do the same thing -- enable the Magic SysRequest key.
>
> The files in
> /usr/src/linux/Documentation/{networking/ip-sysctl.txt,sysctl/*} document
> all the available parameters.
>
> later,
> chris
>
>
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