The kernel of operating systems popularly known as Linux, or sometimes GNU/Linux.

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Where kernel configuration file is stored?

I currently run Angstrom Linux 2.6.32. I intend to upgrade linux kernel from 2.6.32 to 3.0.7. For this reason, I had to configure kernel 3.0.7 running make menuconfig. Now, I want to compare the new ...
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0answers
101 views

EDID Invalid on USB DisplayLink Device

I have a Sabrent USB to HDMI adapter which is a DisplayLink device. It's recognized by udl as being a DisplayLink device, yet seems to be rejected/disabled due to having an invalid EDID: ...
2
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1answer
64 views

IPsec doesn't read configuration when the tunnel is deleted

I've created a tunnel between tow Sites using IPsec. I've made an error in configuration, the address of the destination was false. I delete this tunnel. But the ipsec try after deleting to establish ...
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2answers
133 views

Change kernel parameters at runtime

While trying to fix an obscure hardware bug, it was suggested that adding a couple of parameters to the kernel might resolve the issue. I can of course do that, but I was wondering whether I can make ...
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0answers
78 views

How to apply a patch correctly?

I am trying to patch a linux 3.13.7 source tree to 3.13.8 using the patch-3.13.8.xz file. Since the patch file is in xz format, I used the following command to apply it while in the source tree: unxz ...
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2answers
442 views

How does the system shutdown of a linux kernel work internally?

I have somehow an rough idea of how the userspace and init-system (be it classic init sysV /upstart/ systemd) work at system shutdown. (Essentially there is an order succession of "Stop!", "Please ...
3
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2answers
63 views

Monitor when read/write on metadata or mmaped files hit the disk

On a server hosting a wide range of websites, I often see IO becoming a bottleneck without being able to identify the processes responsible of IO operations with tools such as iotop, iostat or sar. I ...
0
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2answers
91 views

System too slow [closed]

My linux system is responding very slowly.I should wait to get the result of my command. How can i investigate to know the problem of his behavior?
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1answer
52 views

How to automate configuration of the Linux kernel build

I'm compiling a flavor of the Linux kernel based on the default configuration (for an ODROID system), with some additional features enabled. I want to automate this process so that I don't have to ...
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1answer
111 views

How to configure bootloader to boot the new kernel?

I succesfully upgraded linux kernel from 2.6.32.61 to 3.0.7 on BeableBoard-xM, following the steps below: download and untar kernel sources 3.0.7 from kernel.org copy kernel sources on /usr/src ...
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0answers
153 views

death_handler: Fatal signal 15 received

I have problem with my Linux when I try to shut it down. init 0 I get the following error: death_handler: Fatal signal 15 received setsockopt recvref[30]: Protocol not available The sytem will ...
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64 views

Interfacing ds1337 RTC on LPC17xx

I am a newbie and I am trying to understand how to interface DS1337(RTC) on LPC17xx Board. This board uses uclinux 2.6.33. .CONFIG: CONFIG_RTC_LIB=y CONFIG_RTC_CLASS=y CONFIG_RTC_HCTOSYS=y ...
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1answer
35 views

Linux Kernel Compile-time options for Seagate IDE drive

I am configuring linux kernel 3.12.14 obtained from linux.org for compiling using 'make gconfig'. My question is what options exactly I need to enable to make it work for my Seagate IDE HDD? I am ...
0
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1answer
202 views

Can I upgrade my Linux kernel from 2.6.32 to 3.0.7?

I currently run Angstrom Linux 2.6.32 on BeagleBoard-xM (ARM architecture). Can I upgrade my Linux kernel from 2.6.32 to 3.0.7 and what is the difficulty level in case upgrade is possible? EDIT#1: ...
5
votes
0answers
70 views

Is my understanding of kernels correct? [closed]

System: Application OS: Scheduler, VMM, IPC, FS Drivers, dispatchers, VFS The above would be a monolithic kernel. In a monolithic kernel all core OS functions are separate from user space. Functions ...
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0answers
89 views

Choose kernel version in OpenEmbedded

I want to build Angstrom kernel on Ubuntu 13.04 host machine using OpenEmbedded. git clone git://github.com/Angstrom-distribution/setup-scripts.git cd setup-scripts MACHINE=beagleboard./oebb.sh ...
2
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0answers
47 views

Set up OS and Runnig app using x32-ABI

Intro I just moved to a 64bit installation and I'm experiencing big difference in memory usage ( especially for app like chrome, firefox, mysql and java apps ): - While before 4gb were enough now they ...
3
votes
1answer
899 views

Setting CPU governor to on demand or conservative

I'm struggling with cpupower on ArchLinux. I want to set governor to ondemand or even to conservative. First if I do $ sudo cpupower frequency-info --governors, I only get performance powersave. So ...
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0answers
21 views

CLEAN CACHE On X86 Desktop Boxes?

I was building 3.12.13 linux kernel and I came across the CONFIG_CLEANCACHE option. it would seems to reduce I/O considerably especially in conjunction with CONFIG_FRONTSWAP. But I want to know if ...
3
votes
1answer
149 views

What is the “kernel build”, and where do I get it?

I am trying to compile OpenOnload from Solarflare for my nic on a server that I'm building. It is saying something about not having a kernel build. root@server:/usr/src/openonload-201310-u2# ...
0
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1answer
133 views

Trouble using `make gconfig` in ubuntu linux

I am trying to compile vanilla Linux kernel 3.12.14 downloaded from kernel.org. When I try make gconfig, it says: * Unable to find the GTK+ installation. Please make sure that * the GTK+ 2.0 ...
4
votes
1answer
658 views

How to build a custom kernel with localmodconfig that support hardware of multiple machines?

When configuring a server to run a single task, like an appliance, there might rise the need to build a custom kernel. For example to save disk space. Ubuntu Core 13.10 amd64 root filesystem is a ...
4
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1answer
174 views

How to strip unused architectures, drivers, etc from headers when building a custom linux kernel?

I am building custom linux kernel packages in a Ubuntu 13.10 amd64 environment usingapt-get source linux-image-$(uname -r)the debian way make-kpkg clean;fakeroot make-kpkg --initrd ...
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votes
2answers
846 views

Why does Linux have poor battery life by default compared to Windows?

Is there something inherent to Linux operating systems that makes them poor managers of battery power by default? I would have thought a light distro like Lubuntu would have a clear battery life ...
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0answers
51 views

Where is Linux kernel development headed? [closed]

I regularly read development updates from various components of the Linux ecosystem. Of all these, the kernel is the one that seems least transparent to me. Typical kernel release notes mention tons ...
3
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1answer
152 views

Kernel /proc ipv6 settings precedence

I'm about to connect our network to the IPv6 Internet and need to control the kernel ipv6 settings found under /proc. I know there are configurations for each interface, for all interfaces, and the ...
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2answers
611 views

How exactly does printk work internally?

I know printf needs help from the OS to do its job. I also know printf does not work in the Linux source code as there is no library. And so we have printk for debugging. How does printk work ...
0
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1answer
68 views

What is CONFIG_BASE_SMALL=0

Looking at the config file of Linux (that is generated prior to build) I found the following line: CONFIG_BASE_SMALL=0 What does it mean? If I want my linux kernel to be as small as possible shall ...
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0answers
103 views

Looking for a list of modules that are used during boot sequence

I'd like to use deferred init calls. This function allows to load modules in userland, that should actually be loaded during the boot sequence. Just for testing I'd like to modularize as many entries ...
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0answers
74 views

How to cause memory fragmentation on a Linux based embedded device?

Hardware ARM What am I trying to do: Answer: I am trying to create memory fragmentation on a Linux 2.6.31 based swapless embedded device. Why: Answer:I am trying to port some patches to Linux ...
3
votes
2answers
576 views

BSD Kernel Vs. Linux kernel? [closed]

I wanted to know in technical terms; what is the difference between BSD Kernel and Linux Kernel. In Linux, we can download the source kernel then patch it and make and make modules it. Even we have ...
5
votes
1answer
199 views

Linux: What is a tainted kernel?

Under certain conditions, the Linux kernel may become tainted. For example, loading a proprietary video driver into the kernel taints the kernel. This condition may be visible in system logs, kernel ...
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3answers
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Why there are many BSD systems but only one Linux kernel?

Why there are many BSD systems but only one Linux kernel? I wonder why BSD was forked many times, but no such thing with Linux.
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1answer
354 views

Try to disable console output, console=null doesn't work

as mentioned above, I want to to completely turn off the console output, but putting console= or console=null in the kernel command line doesn't change a thing. When I enque quiet to the kernel ...
4
votes
1answer
97 views

How to relate a kernel config setting to the source files?

Here is an example that will explain better: I have a selected the audio driver from the picture and i would like to browse through its source. How do i get to the path of the source files from ...
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1answer
48 views

Does perf includes some “graphing” abilities?

It's possible to create a bitmap or a vector image out of the data collected by the perf profiler under linux ?
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2answers
431 views

“select” vs “depends” in kernel Kconfig

What are the differences in dependencies between select and depends on in the kernels Kconfig files? config FB_CIRRUS tristate "Cirrus Logic support" depends on FB && (ZORRO || PCI) select ...
2
votes
1answer
90 views

Compiling Linux kernel for a router [closed]

I want to make an installable linux kernel that has routing enabled already. So anyone can install it on their machine, do some configuration as required, and machine will work fine for their routing ...
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vote
2answers
309 views

Kernel Configuration: Which Processor Family to choose for 'Celeron M CPU 420' (Core Solo)?

I am trying to build custom kernel (version 3.12.13) for my old laptop and I am unable to determine the Processor Family from the provided list. ( ) 486 ( ) 586/K5/5x86/6x86/6x86MX ( ) ...
2
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0answers
57 views

Why does the kernel boot faster with less memory allocated?

This is not a important question, I'm just curious. Something strange happened, which isn't quiet clear to me: In the kernel command line, the amount of the memory can be set statically with the ...
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0answers
37 views

What are the linux kernel versions incompatibilities with btrfs?

I read that usage of a btrfs volume with a newer kernel can render it unreadable when that same volume is used with an older kernel. I have a mobile storage device that will be used by different linux ...
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vote
3answers
62 views

Structure of GNU/Linux [closed]

I have some basic knowledge about Linux OS like it consist of Kernel.The kernel is core of Linux , It manages all processes, device drivers, and I/O.But My Question is what Linux consists of beside ...
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2answers
60 views

CentOS 6 with Linux-Libre kernel?

I understand that CentOS ships with nonfree blobs in it's kernel. It seems that a "nonfree blob" free kernel exists, a.k.a. Linux-Libre. Is it possible to somehow get CentOS to use Linux-Libre ...
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0answers
94 views

KMS Terminal: How to disable second screen, or how to force a certaion resolution?

I have two screens with different native resolution connected to my Gentoo/systemd machine. since the VTs try to mirror the outputs, they do not use the whole size of the higher resolution screen. I ...
2
votes
1answer
204 views

Virtualbox complains that I don't have headers

I've installed Virtualbox (on Debian testing amd64)according to the wiki. But I get this error: $ virtualbox WARNING: The character device /dev/vboxdrv does not exist. Please install the ...
1
vote
1answer
92 views

Debian/Ubuntu:How to compile a Linux kernel on one machine and use on other machines (same architecture)

Debian/Ubuntu: How to compile a Linux kernel on one machine and use on other machines (same architecture)? I know how to do it on the same machine. But to use a compiled kernel other machines, is ...
0
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1answer
129 views

Which Linux distributions offer a stable release based on the 3.10 kernel?

I'm looking for a stable Linux distribution (preferably a well-known one) based on the 3.10 kernel. So far I have identified Gentoo as one such distribution. But I'm having trouble finding any others. ...
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31 views

Patching the kernel source through git

I'm trying to understand how the patching of the kernel source works. I found the patch that I would like to try an apply on the following page. I found no .patch files that I can use to apply the ...
5
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0answers
158 views

Why are cgroups mapped differently on these two systems by systemd

I have two systems, both running customized variants of OpenSuSE 12.2 (Mantis), both running exactly the same kernel. I get two very different outputs of /proc/self/cgroup or /proc/$$/cgroup on the ...
2
votes
1answer
57 views

How much time do user => kernel mode transitions take?

I'm running Android-on-Linux, and communication of OpenGL ES calls over the QEMU pipe is very slow. QEMU pipes should be the fastest possible way to do this; could this be due to the repeated ...