Fedora :: Subject - Modify Only Parameters In Kernel Config

Aug 28, 2009

I want to start to play with "homemade" kernels. (To get some experiences in this subject). I want to do this step-by-step. I have already read a lot about this. I have a Fedora 10 running. So I want to start with this. I have read that there is a "special" way to create a kernel for Fedora. [URL] OK. I understand this +/-. When you build a new kernel with an other version number, you have to rebuild all the modules with this new kernelversion, and you have to install these also.

But : I want to start with modify only some parameters in my kernel config. Do I need to rebuild and re-install the modules also? Will it not be enough to rebuild only the kernel? (vmlinuz) Where can I find some information about the options I can disable in my kernel to speedup my system? (boot process ed). I want to suppress the loading of unneeded modules. I want to understand the options in menuconfig (and there are a lot of options ! ! )

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Ubuntu Installation :: Kernel Parameters : How To Modify Them

Feb 4, 2010

Bottom line first: Is there a GUI or otherwise friendly tool to modify the kernel parameters? One that will give help on a highlighted parameters?

Now as to my reason for this question:

In preparing for an Informix installation, I may need to change some kernel parameters. I could follow the advice of G�rard BIGOT from a couple of years ago at this URL. However, messing with the kernel this way, by directly editing /etc/sysctl.conf, is a bit scary. I have already backed up the current one and started editing according the Informix machine notes. However, I have commented out my new settings. [:Chicken]

The scariest aspect of this is that the notes recommend settings to kernel parameters that I do not find in /proc/sys/kernel. for example, it recommends setting SHMMIN to 1 but when I can /proc/sys.kernel/shmmin, there is no such file. (I did find shmmax.) Similarly for the very logical shmseg (max number of shared memory segments) - not found. I am afraid to add these into sysctl.conf if the equivalent pseudo-files don't exist.

Additional question: Where [on-line] do I find all kernel parameters documented? This is so that I am more certain of what I am doing instead of relying on my memory. For example, I don't recall the names of the parameters that control Kernel-Asynchronous I/O (KAIO) events.

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Fedora :: GDM Theme - What Parameters To Modify Archive

Feb 9, 2011

I want install the next GDM Theme [URL]. The problem is in modify the archive /etc/gdm/custom.config for install the theme. I don't know what parameters or command write. I just know where copy the folder of the GDM theme, but the configuration no.

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Fedora Installation :: Can't Modify Files Like Shadow Or Config

Aug 3, 2011

1- how I can deactivate selinux and the root password on fedora 15?

2- I can't use copy, cut past in the GUI !!

3- even with (su -) I can't modify files like shadow or config !

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Fedora :: New Kernel - New Audio - Disable Feature - Tweak The Parameters Like Crossover Frequency?

Sep 1, 2010

i have an hp pavilion dv7 and am using f13 64bit. my laptop has a built in woofer underneath that i have never been able to get to work. after the latest kernel update today my laptop now has woofer sound. there must be some new support for my laptops audio card. the problem is that it is a little overbearing. how can i a) disable this feature b) tweak the parameters like crossover frequency or gain? edit: i checked the changelog for 2.6.34 and couldn't find any info on any new audio support features.

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Ubuntu Servers :: Modify Apache IPv4 Configuration To IPv6 Config?

Feb 25, 2011

I want to modify apache IPv4 configuration to IPv6 configOn both windows and ubuntu.

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Fedora :: F12 2.6.33 Kernel .config For Menuconfig

Mar 14, 2010

I'm experimenting with 2.6.33-ck1 mainly because I want to try the BFS. I successfully configured and installed the patched kernel, but I'm experiencing various problems on the desktop. The biggest is Chromium not working at all, but there are several others, including graphical glitches in firefox. I'm sure I left some important module off or made a mistake for some settings My question is that is there a 2.6.33-fc12 kernel yet, and does it have a .config available? I'd like to load those settings in menuconfig and use them as a starting point to properly configure and complie a -ck patched kernel.

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Fedora Servers :: Kernel .config For A VPS?

Jun 20, 2011

have a sample kernel .config, so I can compile a small custom kernel on my vps? I tried to make it alone,but I removed stuff,so that my VPS won't start anymore. Virtualization is KVM, running on a Core 2 Duo.

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Server :: Cannot Set Kernel Parameters / What To Do?

Feb 8, 2011

I have a strange problem with RHEL4.7, with kernel 2.6.9-78.

I cannot set any kernel parameters by editing sysctl.conf file and run sysctl -p, everytime the old value appears, while it was possible before.

I tried to edit files under /proc by using vi when trying to save it gives me: E667: Fsync failed!
While echo 1>/proc/sys/net/ipv4/ip_forward also cannot edit the file.

Also I mounted proc device on another mount point:

# mount -t proc proc /mnt

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Fedora :: Override .config When Building Kernel Rpm?

Jul 14, 2011

I am using FC15.I need a kernel with a different configuration - with the "Preemptible Kernel (Low-Latency Desktop)" option in the Processor Type and features menu. I need this to support my firewire audio device. I would like to build a new kernel RPM from the SRPM so that i can keep a clean system with RPMs for all files, and I don't really want to manually override the kernel bypassing RPM.I am following **exactly** the process described there - I install the SRPM, unpack the source, then use the starting sample config files in the BUILD folder to create a new customised .config file with the new option, then copy this back to the SOURCE folder.

This works perfectly if I make a standard kernel. But I cannot get the process to work if I change the config file. Every time I compile I end up with exactly the standard kernel -- a vanilla i686 kernel, without my custom config.I believe the problem is that when I run rpmbuild to compile the kernel, this process overwrites my config option. I found that there is a script (merge.pl) which creates new config files dyanmically for all kernel options based on fragments in the SOURCE folder. It looks like the script never uses the config file that I am putting into the SOURCE folder.The wiki page suggests using this command to copy my custom config file cp .config ~/rpmbuild/SOURCES/config-`uname -m`

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Fedora :: Get A Proper Config To Compile A Vanilla Kernel?

Jun 29, 2011

Im using a Fedora 15 and im trying to compile a 3.0.0rc5 kernel. but im unable to get a config for my machine to boot up. i tried make localmodconfig it says

using config: '.config'
capifs config not found!!
Restart Config

and then i tried cp /boot/config-2.6.38.6-26.rc1.fc15.i686.PAE .config to override the default config but stil that doesnt work. work around to get a proper config so that i can boot the latest kernel here?

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Fedora :: Recover .config After Building Customized Kernel

Oct 18, 2010

Supposed I have built customized kernel rpm four times in a row and the latest built kernel failed. If I still have all four kernel.xxx.rpm files, is there any way that I could get back the .config file used for each of those four builds? I really could not recall exactly what changes I had made in .config for each build.

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Ubuntu :: How To Edit Kernel Boot Parameters

Jun 18, 2010

Ubuntu 10.04 Gnome IBM Thinkpad 600e.I am trying to get sound going in my 600e which has the wrong chips in the sound card. I found some notes from 2008 that said in one of the steps to add the following to my kernel boot parameters: noapci nolapci notsc acpi=off pnpbios=off pci=noacpi

It said to hit the Esc key when I see the Grub Count on boot up to get into the kernel boot parameter's editor. However, I am not seeing any Grub Count and pressing the Esc key every second during boot up doesn't seem to get me there either. I have been searching for how to edit the boot parameters but no luck so far.

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Ubuntu :: Cannot Save GRUB Kernel Parameters

Apr 27, 2011

We're using 10.10-server. We are trying to make grub boot changes permanent. I've already looked at thread [URL]. We updated /etc/default/grub, and update-grub propagates those changes into /boot/grub/grub.cfg, but not into menu.lst. It appears to use menu.lst as the source at boot, so our change doesn't show up as a linux parm.

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Installation :: Grub2 Not Passing Parameters To Kernel?

Sep 8, 2010

I have installed grub2 on a flash drive to boot some os's that I want to carry around. But in grub.cfg when i put this:

Code: menuentry "BackTrack Persistent" {
set gfxpayload=1024x768
linux/backtrack/boot/vmlinuz BOOT=casper boot=casper persistent rw quiet
initrd/backtrack/boot/initrd.gz
} it does exactaly the same thing as this

[Code]....

I'm thinking of filing a bug report but I want to make sure i'm not doing something wrong first.

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General :: How Increasing RAM Affects Kernel Parameters

Nov 16, 2010

We just doubled the RAM on our RHEL 4 production servers...Oracle from 16gb to 32gb and Apache/JBoss from 8 to 32 gb. I am trying to figure out how to get the biggest bang from the increased RAM. Should kernel.shmmax be upped to be 50% of the 32gb....from its current 8gb? I need to create the largest possible SGA and was unable to do so, apparently because the kernel.shmmax value had gone unchanged.

And for the JBoss web servers, also RHEL 4, and particular kernel changes which can take advantage of the increased RAM and provide an immediate performance improvement?

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Programming :: Insmod: Error Inserting 'kernel.ko': -1 Invalid Parameters?

Jan 16, 2010

insmod: error inserting 'kernel.ko': -1 Invalid parametersI am getting this error when i am try to insert kernel.ko into kernelMy systemfedora 12 with gcc 4.4.2insmod kernel.koinsmod: error inserting 'kernel.ko': -1 Invalid parametersmy program

__________________kernel.c________________________ ___________

#include <linux/module.h> /* Needed by all modules */
#include <linux/kernel.h> /* Needed for KERN_INFO */

[code].....

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General :: Extracting Kernel Config From Kernel Image -- Extract-ikconfig

Jan 22, 2010

I'm trying to run extract-ikconfig because I've mistakenly deleted an old kernel config that I'd like to recover. However, when running the script from the latest (2.6.32.5) tree I run into this error:

Quote:

ERROR: Unable to extract kernel configuration information.

This kernel image may not have the config info.

Coincidentally, this happens with all of my kernel images. Is it a fixable problem? I should really set CONFIG_IKCONFIG_PROC next time..

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General :: Find Out Exact Kernel Parameters When Corrupt Boot Loader?

Feb 8, 2010

How do i find out the exact kernel parameters (from the grub config file) when the boot loader is corrupt. Seems like a catch 22 that I need the exact boot parameters when I cant get to a prompt to read the grub.conf file to being with.

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Fedora Installation :: Mkinitrd Can Make Initrd Image With All Hdd Driver - Config To Everytime Update Kernel?

Jul 16, 2009

I install fedora on my usb-hdd. Sometimes i boot it from real machine, sometimes i boot from virtual machine (kvm). When I boot from real machine, hdd driver is usb-storage, when i boot from virtual machine hdd drivers are ata_generic and pata_acpi.

Everytime i update kernel, mkinitrd only create initrd image contains only hdd driver current running, and I must recreate initrd manual with all preload hdd driver. How to config fedora to everytime update kernel, mkinitrd can make initrd image with all hdd driver I need?

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Ubuntu Installation :: Set The Kernel Parameters To Perform An Unattended Install Using Preseed File?

Oct 23, 2010

I would like to create an unattended install ubuntu 10.10 cd. I have followed the ubuntu [URL].. on creating the preseed file, however, I can't find any useful tutorial on how to set the kernel parameters to perform an unattended install using my preseed file.

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Ubuntu Networking :: WUSB600N - Modify The "os/linux/config.mk" Like I Described In My Previous Message

Mar 6, 2010

i have downloaded the RT3572 driver from railink and put it in my home folder executed the following then:

Code: bunzip2 2009_1222_RT3572_LinuxSTA_V2.3.0.0.tar.bz2
Code: tar -xvf 2009_1222_RT3572_LinuxSTA_V2.3.0.0.tar

no problems here I have modified the 2 files as instructed:

Quote:

4) add the device and vendor id "{USB_DEVICE(0x1737,0x0079)}" between the "#ifdef RT35xx" and "#endif // RT35xx //" in the file "common/rtusb_dev_id.c"

5) modify the "os/linux/config.mk" like I described in my previous message

no problems here: next step according to all instructions: sudo make and sudo make install, trips me up, i get "no targets specified and no makefile found" probably a basic mistake somewhere here, but my knowledge of the command line is zilch

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Ubuntu :: How To Modify Kernel And Compile It

Aug 16, 2011

I am new to Linux Kernel. I want to disable branch prediction in kernel and recompile for my research purpose. Can anyone point me to clear instructions on where i can find the kernel config file in ubuntu and steps to recompile the updated kernel

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Programming :: How To Modify System Kernel

Dec 7, 2010

For my work, I have to modify the routing lookup process at Linux kernel.

The details is below:

A-----B.

We have pcA, pcB (using Linux OS kernel 2.6.26.5) connect together. We need to modify the source code of kernel at B in order to if A sends the packets with destination IP address as C, pcB still receives this packet and send to transport layer (that means, it bypass the routing lookup process at kernel).

The solution I used as the following code...

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Oct 4, 2010

I want to modify the source code of the kernel so that the new compiled kernel should disable USB ports.

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Debian :: Modify The Source Of A Custom Kernel?

May 1, 2011

I'd like to create a custom squeeze kernel. Is it a really bad idea to edit to edit the kernel config file directly instead of using "make config", "make menuconfig" or "make gconfig"? My problem is I missing a search function, for example in "make menuconfig" and cannot find some entries.

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May 1, 2010

How to modify kernel to non-preemptive process scheduling only. Suggest any site that provides this kind of source code.

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Ubuntu :: Trying To Patch 10.10 I686 - 1 Out Of 1 Hunk FAILED -- Saving Rejects To File Linux-2.6/Documentation/kernel-parameters.txt.rej

Nov 16, 2010

I saw this forum post and I want to try it out so I went here and copied and pasted the following text into a file called test.patch.

Code:
---
Documentation/kernel-parameters.txt | 2
drivers/tty/tty_io.c | 1
include/linux/sched.h | 19 ++++
init/Kconfig | 12 +++
kernel/fork.c | 5 +
kernel/sched.c | 25 ++++--
kernel/sched_autogroup.c | 140 ++++++++++++++++++++++++++++++++++++
[Code]....

1 out of 1 hunk FAILED -- saving rejects to file linux-2.6/Documentation/kernel-parameters.txt.rej I'm not so good with patching so I am sure it is probably something easy.

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Slackware :: How To Modify Grub To Boot Using Generic Kernel

Feb 16, 2011

My Slackware boots using the huge kernel. I am not using LILO; I am using GRUB from the extras directory on the DVD. I followed the tutorial @ [URL] up to the point where it discusses modifying LILO. My /boot/grub/menu.lst reads, in part:

# Linux bootable partition config begins
title Slackware Linux on (/dev/sda7)
root (hd0,6)
kernel /boot/vmlinuz root=/dev/sda7 ro vga=normal
# Linux bootable partition config ends

This boots the huge kernel. What changes must I make to the above menu.lst entry to boot using the generic kernel?

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Feb 9, 2009

I have Mandrake 9.0 with 2.4 kernel, this comes with a GUI kernel config, its a nice feature as it details each kernel item. I installed a Mandriva 2009 edition w/2.6.27 kernel and want to add the GUI kernel config, does anyone know of a package to do this

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