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Limitation//Moon

Tweak your LINUX Kernal

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basic kernel configuration

 

Now let's say you just installed the kernel source packagesfrom your favorite distro on your brand spanking new super cool box..

You'd like to optimize the kernel..

 

First of, you go to the kernel source directory, usualy by typing

cd /usr/src/linux

 

Most distro's come with their own fully packed kernel configurations

that support most hardware, this way their distro will boot on damn nearly any kind of puter..

 

We don't want that, we just want our nice optimized for this box ony kernel..

 

So first we need to know what we have in the box..

 

by typing lspci as super user (root) you'll get something like this..

root@computer:/usr/src/linux# lspci

00:00.0 Host bridge: ServerWorks CNB20-LE Host Bridge (rev 01)

00:09.0 USB Controller: Compaq Computer Corporation ZFMicro Chipset USB (rev 05)

00:0d.0 VGA compatible controller: Matrox Graphics, Inc. MGA 2164W [Millennium II]

00:0f.0 ISA bridge: Compaq Computer Corporation Triflex PCI to ISA Bridge (rev 0c)

00:0f.1 IDE interface: Compaq Computer Corporation Triflex Dual EIDE Controller (rev 0a)

00:11.0 Host bridge: ServerWorks CNB20-LE Host Bridge (rev 01)

01:07.0 Network controller: Compaq Computer Corporation ProLiant Integrated Netelligent 10/100 (rev 10)

01:09.0 SCSI storage controller: LSI Logic / Symbios Logic 53c875 (rev 04)

 

 

It would be a good idea to print this.. or keep somwhere where you can

find it..

 

Now let's clean up that kernel, but before we do that we copy the kernel

configuration file to a safe place, and there's no place like home..

cp .config /home/RAJUNPL

 

Were still in the kernel source folder and type make mrproper

This removes all old intermediate objects and loads Linux Torvalds default

kernel configuration..

 

Now we can make menuconfig or make xconfig and

add the stuff we need (or want) and remove the stuff we don't need..

 

If you still can't find any kernel parts for your hardware, try

lspci -vvv this gives a whole lot of info so

proppably lspci -vvv | less would be smart..

 

if it's a 2.4.x kernel then you'll need to do a

make dep

if it's a later kernel you don't need dep

 

Then I usualy do:

make bzImage modules -j3 && make modules_install install

But some might like: make bzImage modules modules_install better and do their own installing.

 

That's all..

 

 

If you are using lilo, and make install.. be sure to add the .old image make install creates.

That way you can allways use the previous kernel image (do remember that this only works once, the .old file is overwritten next make install)

 

reboot

 

Now if you're not planning on doing anything to your kernel anymore you can

remove the intermediate files (again)

 

make clean

 

This makes the next time you compile the kernel take signifficanlty longer,

all the parts have to be re-compiled, couse you removed all the intermediate objects.

 

So only make clean if you realy need the diskspace!

and are willing to wait a little longer next time you compile the kernel..

 

That's all for now

 

 

 

 

 

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