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

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713 views

Broadcom Corporation BCM4313 WLAN does not work on installed Arch

I have a Broadcom Corporation BCM4313 WLAN Controller in my netbook. When I boot the Arch live ISO and set up the network with wpa_supplicant everything works fine. On the installed Arch I get the ...
3
votes
0answers
1k views

“Northbridge Error (node 0): ECC Error in the Probe Filter directory”

I've received an e-mail from a user worried that the following errors on one of his servers is indicative of a serious problem. The trouble is, the errors below are all that I have to go on. I ...
2
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0answers
52 views

Linux kernel API changes/additions

I'm trying to find a webpage or docs or XYZ that will allow me to see all the API changes/additions/removals between two kernel versions. I found http://kernelnewbies.org/LinuxChanges, but I'm not ...
3
votes
2answers
942 views

replace xen kernel with non xen kernel

I have a virtual appliance in Xen format (XVA) that I wish run to on another hypervisor (MS Hyper-V). What have I done so far: I have converted the XVA to OVF using XenConvert, this resulted in a vhd ...
1
vote
1answer
556 views

How to configure linux to output to monitor

I'm currently running a lightweight Debian distro on a development board from Compulab. I have to login to the system via serial port everytime. The system has graphical card and the driver is ...
8
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4answers
2k views

enabling numa for Intel Core i7

In Linux kernel, the documentation for CONFIG_NUMA says: Enable NUMA (Non Uniform Memory Access) support. he kernel will try to allocate memory used by a CPU on the local memory controller of the ...
9
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3answers
510 views

kernel: Namespaces support

I am wondering what exactly the “Namespaces support” feature in the Linux kernel means. I am using kernel 3.11.1 (the newest stable kernel at this time). If I decide to disable it, will I notice any ...
0
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1answer
74 views

Random bug in Linux

Some time ago, I remember reading an article on randomization in computing, and how random you can actually get a system to be. The article came about, if I'm not mistaken, because of some seemingly ...
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2answers
878 views

Can anyone explain the output of mount?

I'm getting the following output when the mount command is executed. [root@]# mount /dev/sda2 on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type ...
0
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1answer
631 views

OS errors : kernel: EDAC k8 MC0: extended error code: ECC chipkill x4 [duplicate]

We noticed the server crashes with below errors. Not sure it is related to any defected piece of the hardware or totally not related to Server detail:Red Hat Enterprise Linux ES release 4 (Nahant ...
0
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0answers
138 views

How to compile video4linux for ARM?

I would like to use a webcam using a Linux over ARM board. Through reading, I have discovered video4linux so I would like to compile it for ARM. My unique notes are: git clone ...
0
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2answers
60 views

Is there kernel patch to prevent load files into RAM for LiveCD?

Is there kernel patch to prevent load files into RAM for LiveCD? I mean, if I'm use LiveCD with "boot to Ram" option, there is no needs for kernel to load executable binaries to RAM from RAM. It ...
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1answer
38 views

Linux Kernel Firewire Feature: Use Unclear

In the Linux kernel, there is a setting "FireWire SBP-2 fabric module". I do not understand the documentation: Say Y or M here to enable SCSI target functionality over FireWire. This enables you ...
2
votes
2answers
578 views

Why is the kernel boot failing?

I am trying to boot from 3.11.1 kernel image on my system having Ubuntu 12.04 (kernel 3.2.0-53) I used make defconfig and then compiled, placed the image in /boot, updated GRUB, and then rebooted. ...
0
votes
1answer
112 views

centos 6.4 trouble with /dev/pts/ptmx

I have a problem with the server running on CentOS. CentOS has been upgraded to version 6.4 and has all updates. Updates were made according to the official repositories. On the server running the ...
7
votes
2answers
157 views

Why should I build a custom kernel? [closed]

Several of my coworkers have been building custom kernels for their workstations and servers. What advantages/disadvantages are there to building a custom kernel? Why should I build a custom kernel? ...
4
votes
2answers
454 views

How do I search the linux kernel mailing list archives?

I want to research why a Linux kernel feature appears to be missing from my Linux install by searching the Linux kernel mailing list for recent discussions on the subject. The only site that I've ...
1
vote
1answer
117 views

Using qemu to boot OpenSUSE (or any other OS) with custom kernel

I want to run OpenSUSE as guest with a custom kernel image which is on my host machine. I'm trying: $ qemu-system-x86_64 -hda opensuse.img -m 512 -kernel \ ...
8
votes
1answer
531 views

How is nice working?

sched_setscheduler says : All scheduling is preemptive: if a process with a higher static priority becomes ready to run, the currently running process will be preempted and ...
2
votes
3answers
407 views

How do I know which kernel configuration option enabled my driver?

TL;DR: when I was trying to compile a driver for USB DAQ device I have reconfigured the kernel. The driver refused to compile under the default distro's kernel but everything works with my tweaked ...
105
votes
3answers
7k views

What does the Windows flag in the Linux logo of kernel 3.11 mean?

I've just installed kernel-3.11.0-1.fc20 for my Fedora 19 installation. During the rebooting progress, I saw the Linux logo with a Windows flag in it, what does it mean? The Fedora 19 is installed ...
2
votes
3answers
739 views

Boot my kernel in a Virtual Machine?

I'm learning now how to compile and boot linux kernels. Is there a way to boot kernels in a virtual machine, rather than messing my system? I use VMWare Workstation on Windows 8. Can I use that to ...
2
votes
1answer
418 views

Compile the Ubuntu “Raring” Kernel with the Intel Compiler

Of course, the first question is: why I'm doing this. Just for fun! I'm learning more about Linux kernels and I have a virtual machine that I can replace in 15 minutes. Getting to business, I don't ...
2
votes
1answer
316 views

How enable watchdog?

I'm struggling with the watchdog timer (wdt) for a while. I can't get it working. My microcontroller is a AriaG25, based on the AT91SAM925. I have used this tutorial to compile the kernel. The ...
2
votes
1answer
62 views

Monitoring file reads for cache warming

After adding more memory to my Linux machine I was tempted to use the cache more agressively. The thing is: I boot up my machine, go to bathroom, come back and log in. It takes like half a minute to ...
0
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1answer
59 views

What part of the Linux kernel determines the execution order of userland apps? [closed]

Stripping the source, I can't pinpoint which part of the kernel sets and manages the userland apps, and how it does it. For example, in the Linux main source, is the procedure have options to set ...
2
votes
1answer
862 views

How to learn kernel programming from the start? [closed]

I have completed my graduation recently. And I have only basic knowledge in C. But I would like to work on the Linux Kernel, and customize it according to my needs. Not only customize I would also ...
2
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0answers
206 views

how to stop kernel threads preempting real time user space processes?

I created some processes in user space and tried to visualize its working in kernelshark with the trace recorded using trace-cmd. But kernel processes like the ones shown below are preempting my ...
2
votes
1answer
462 views

CONFIG_RTC_SYSTOHC: how to use the NTP synchronization option in the kernel

I have noticed in kernel 3.10, there is an option CONFIG_RTC_SYSTOHC Device Drivers -> RTC -> Set the RTC time based on NTP synchronization The help says: If you say yes here, the system ...
3
votes
2answers
1k views

Which file in kernel specifies fork(), vfork()… to use sys_clone() system call

When ltrace is used for tracing the system calls, I could see that fork() uses sys_clone() rather than sys_fork(). But I couldnt find the linux source where it is defined. My program is ...
3
votes
1answer
139 views

How can I override the kernel default options for mount?

I'm struggling with a program that creates a file system in a file and mounts it as a loopback device. The purpose of the program is to create a clone of the root file system and it thinks it's being ...
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vote
3answers
122 views

Does a fault in a kernel module necessarily result in a system crash?

Or is it possible to overcome the fault, since the code isn't in the monolithic part of the kernel?
32
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3answers
2k views

Does the kernel have a main() function? [closed]

I am learning device drivers and Kernel programming. According to Jonathan Corbet's book, there is no main() function in device drivers. So I two questions: Why don't we need a main() function in ...
2
votes
2answers
1k views

Install kernel-devel of specific version in fedora 19

So I have different "installed" kernel versions from the running kernel version, on my fedora 19 machine. To give a more clear idea, here is my terminal output: [user@home ~]$ uname -r ...
11
votes
4answers
6k views

Can I create a virtual ethernet interface named eth0?

This is a rather odd question, because normally it would not make sense to do that. I am running Arch based on the Linux 3.10.5-1 kernel. The system uses the new de-facto naming conventions of ...
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0answers
375 views

PC sudden shutdown, Sensors show normal temps, Thermal event interrupts shows 1276

I'm experiencing sudden shutdowns on my Linux systems. Using Ubuntu 12.04, my kernel version is 3.5.0-37-generic #58~precise1-Ubuntu. Running a Acer M5 581t(G) with 6 gigs ram laptop. I have been ...
2
votes
1answer
214 views

Generate interrupts for purpose of stress testing

I'm testing the quality of a generated PWM signal on a Raspbery Pi. I would like to test how it behaves if there are lots of interrupts coming. Is there a way to fake interrupts or force 2000 ...
1
vote
1answer
642 views

Beaglebone Black Device Tree for LCD4 cape

The device tree for LCD4 cape is located at /lib/firmware/BB-BONE-LCD4-01-00A1.dts When I looked into it, the declaration of those GPIO buttons confuse me. There are five buttons according to ...
0
votes
1answer
78 views

Building Linux from Scratch stuck, incompatible sed version? [duplicate]

I am trying to build Linux from Scratch per LFS website While I was able to install all the packages until 6.7.1 without any error, I am stuck at Installation of Linux API headers (This is after I ...
7
votes
2answers
241 views

Strange temporary network outage in Linux

I'm facing a very annoying problem that I noticed a week from now and for which I can't find an answer: my network suddenly stops responding, usually coming back exactly 25 seconds later. I was using ...
2
votes
2answers
1k views

Linux (debian/testing) cannot boot after installing kernel 3.9.1

Today I wanted to upgrade the kernel on my debian/testing system from 2.6.32-5-686 to 3.9-1-686-pae. So I installed the image by sudo aptitude install linux-image-3.9.1-686-pae (or something like ...
1
vote
1answer
167 views

What value is stored in linux xtime variable?

Whenever I print the value of /proc/interrupts the value of rtc0 in IRQ8 which is for RTC shows only 1 interrupt on CPU0. I have read that when booting the value of the xtime variable is stored from ...
2
votes
1answer
384 views

Why CONFIG_NO_HZ is not set by default

In the Linux Kernel CONFIG_NO_HZ is not set. But an initial reading suggests that setting that option would be nice from a performance point of view. But reading some posts like this made me think ...
1
vote
1answer
86 views

Why can't new versions of kernel solve the backlight problem?

Currently I am using Linux 3.8.0-27-generic kernel on my Samsung laptop. I replaced grub configuration file with the following text to make backlight control work: GRUB_CMDLINE_LINUX_DEFAULT="quiet ...
3
votes
1answer
1k views

What is meant by interrupt remapping in Linux?

Can anyone explain what the interrupt remapping is? Would turning this feature off in the Linux kernel cause any problems, or bring any benefits?
1
vote
1answer
147 views

Efficiency of Linux Kernel [closed]

In a documentary, Linus Torvalds says that even in the future, if anyone wishes to make a new OS from the scratch, they could use the Kernel which he wrote. It was very inspiring. Is it true that ...
2
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2answers
788 views

Can system calls be interrupted?

Please comment on the following sentence: On the standard Linux kernel without the rt patch, interrupts can't interrupt ongoing system calls. The reason why our machine doesn't stop working ...
2
votes
1answer
349 views

Are time interrupts always followed by a scheduler call?

When a timer interrupt occurred the ISR is called to service the interrupt. Is it okay to assume that every timer interrupt ends with a call to the scheduler on which process should continue running ...
0
votes
1answer
49 views

CentOS - acts abnormal every week and causes my whole setup to be down, how can I rollback / restore back to one week?

I have CentOS and Red hat enterprise Linux running, where I have now working Google Apps Engine and related other Python web applications. Every week or depending on any Google Apps Engine latest ...
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0answers
78 views

boot updated kernel image on beagleboard

Boot updated kernel image on beagleboard. I had installed a kernel on Beagle-board to update image of kernel to it. I've used this command: $ sudo apt-get install linux-image-3.2.0.49-omap It ...