The main component of most operating systems, the kernel manages most of a computer's communication between hardware and software. Typically, the kernel is the lowest level of abstraction a programmer can have to a resource.

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How can I install kernel 3.4 and its sources on Ubuntu 14.04

The application I am trying to build is incompatible with the current kernel (3.19). It only supports kernel versions up to 3.4. I'm running ubuntu 14.04. What would be the correct procedure to ...
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113 views

Linux kernel AVX2 support

I would like to know when was the Linux kernel modified to incorporate full support for AVX2 instruction sets. I have tested some software using AVX2 instruction set that someone else claims is 20% ...
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What is the size of nanokernel?

My kernel size is approximately 32KB. Can I call this as nanokernel? what is the size limitation (or range) for kernel to be called as nanokernel?
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447 views

How to upgrade kernel in Ubuntu 14.04?

I want to use Docker on my Linux server for which I need to upgrade the kernel to 3.10 or higher. So following this answer I was trying sudo apt-get install linux-generic-lts-trusty, which results in: ...
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171 views

Hairpinning in Linux

I have a router in which I installed a Linux system. I want my router to support NAT hairpinning. Does a such feature exists in Kernel Linux? If yes how to activate it? Are there a patch to apply it ...
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53 views

Disable kernel module loading on custom initramfs.igz

my machine, which runs GNU/Funtoo Linux on one of the 2 raid0 arrays it has, needs an initramfs with dmraid support to boot into the system. During the last 7 years i've been using a custom initramfs ...
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1answer
42 views

Backing Up Kernel Modules from a GNU/Linux installation

How can I create a backup of all the driver modules (especially those that are not part of the original kernel yet) from an installation of GNU/Linux OS? The original source of the proprietary ...
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69 views

Installed libncurses5-dev, but can't make menuconfig [closed]

I'm new to Linux, I found some links in Internet to Build and install Kernel(Just want to play :-P). I installed required libraries(ncurses libraries), kernel headers(sudo apt-get install ...
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145 views

ping not calculating microseconds anymore

Today I decided to update my old el5 kernel with yum after years. What I didn't know is that the kernel that was running was custom and after updating and rebooting the network drivers started to fail ...
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34 views

user mode linux - how to create 32-bit linux

i am trying to compile my own UML kernel. I achieved to created a ./linux executable, however this is 64bit on my 32 bit system. file vmlinux vmlinux: ELF 64-bit LSB executable, x86-64, version 1 ...
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2answers
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Does Installing a driver increase linux kernel memory footprint?

I have read that linux kernel is monolithic kernel and it contains drivers within it, in a single file. For example, I have two linux kernels 3.16.0.40 and 3.16.0.50 Currently booted system with ...
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616 views

Kernel-Power 89 (86) entries in Windows system log

Earlier my PC used to reboot randomly showing: CRITICAL: Kernel-Power 41(63) there were 2 AVIRA antivirus file avpbb.sys and other launching at same time, therefore I removed AVIRA FREE EDITION. ...
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136 views

High kernel latency ALL windows

I have been known about this site for a while. So I decided to register since most hardware and enthusiast forums well uhh you know, not worth it. Im a certified hardware tech and I noticed some ...
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42 views

Is OS X still using Mach as kernel and why did they move it?

When I updated to Yosemite I found out that Mach_kernel was no longer present in root (I develop a lot so I have show all hidden files set to YES). After a bit of searching I found the new location of ...
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Why is the first BIOS instruction located at 0xFFFFFFF0 (“top” of RAM)?

I know that BIOS loads its first instruction from 0xFFFFFFF0, but why this specific address? I've a bunch of questions and hope you can help me with some of them, at least. My questions: Why is the ...
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365 views

Ubuntu 15.04 kernel panic — not syncing attempted to kill the idle task

I just purchased a Lenovo W540 workstation with the following specifications: CPU i7-4810MQ (quad core) 32 GB RAM 2 TB SSD storage capacity Nvidia Quadro K1100M 2GB graphics card. Windows 7 Pro OS I ...
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157 views

How does the kernel determine cache line size at runtime?

I noticed /proc/cpuinfo offers a cache line size: # cat /proc/cpuinfo | egrep "(cache|clflush)" cache size : 6144 KB flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat ...
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88 views

kernel(security_netlink_recv) = 0x3a2204c6 is needed

I am trying to install drbd (packages are fetched from elrepo). Both drbd and kmod-drbd are version 8.4.3-1 and I am using CentOS 6.7 with kernel version 2.6.32-573.el6.x86_64. When trying to ...
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95 views

udev - change event from udev_device_get_action

I am monitoring the events of all devices connected to the host. Linux has udev daemon , which listens to all the device specific events such as online, offline, add, remove and change. I use a ...
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55 views

How can I understand what happens to my laptop?

I'm running Ubuntu 14.04 LTS which was recently upgraded to 14.04.03. With that upgrade came a new kernel (i.e. 3.11.0-18-generic) that breaks my X server. If I select a previous kernel version (i.e. ...
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28 views

IOstat command changes in Linux Kernel 4.2

I implemented this IOStat command http://sourceforge.net/projects/iostat/ in Java successfully but it turns out that this command is working only for Linux Kernels between 2.4 and 2.6. If someone is ...
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792 views

Computer crashes constantly after upgrading from Debian Wheezy to Jessie

I’m on a Lenovo ThinkPad T430 which had Debian Wheezy running solid/stable. No crashes, ever. Upgraded to Debian Jessie recently and been having crashes; it seems like Gnome crashes. By crash, it ...
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Debian 8.2 with Kernel 4.2 on Dell XPS 13 9343

I followed the guide at https://wiki.debian.org/InstallingDebianOn/Dell/Dell%20XPS%2013%209343 and managed to make everything work. (I installed an extra package for Wi-Fi afterward.) Then I ...
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61 views

Getting “Microsoft-Windows-Kernel-Power” on an Acer Aspire 7740

Sometimes I’m getting the blue screens of death on my Acer Aspire 7740. Those are due to “Microsoft-Windows-Kernel-Power.” I Googled and thought its because of overheating. So I cleaned my notebook ...
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716 views

iwlwifi failing with error code -2

On fedora my wifi isn't working. I tried re installing it but that didn't work. When I perform a dmesg | grep wifi I get errors: [ 15.680914] iwlwifi 0000:01:00.0: Direct firmware load for ...
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48 views

Customized kernel shows one cpu in core2duo

I have installed Debian 8 in my Core2Duo system. lscpu shows 2 cores are available- 0,1 To build my customized kernel, I have downloaded kernel 3.18.21 from kernel.org. I have followed this ...
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25 views

Does a kernel control the opcodes allow by applications?

I'm wanting to get a head start on my course and one major topic is kernels. If a program (.exe) was to try and write over the kernel space, what blocks it from doing so? Does the kernal decide ...
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102 views

kworker is running modprobe every second

Using fatrace, I discovered that on my computer, modprobe runs approximately every second. To find out why, I replaced modprobe temporarily with this script: #!/bin/bash echo "$0" "$@" > ...
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2answers
345 views

High CPU from ntoskrnl.exe during idle on GetStackLimits

I'm having a weird bug in Windows 10. After 5 minutes of idle, my cpu goes high. I used Win Performance Analyzer and found that it happens inside the ntoskrnl.exe on the thread GetStackLimits. I ...
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1answer
369 views

Centos 7 , cant update kernel

I am running centos-7(vm) on http://www.ovh.com/. My kernel version is 2.6.32-042stab108.8. Even after yum clean all && yum update and reboot. still kernel version is 2.6.32-042stab108.8. Any ...
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27 views

Linux kernel working only on kernel mode [closed]

Porting the Linux kernel to an architecture that has no execution modes (is always in kernel mode) and has no MMUs seems like a very unprotected system. Would it be possible to make Linux run in that ...
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136 views

Kernel task memory is not released in Mac OS X 10.10 (Yosemite)

I was working on a large Illustrator project in Mac OS X 10.10 (Yosemite) which takes up 4.5GB+ memory but after I save and quit the application, my kernel task has still 4.8GB in it and not being ...
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69 views

Signing Error during kernel compilation

I was trying to compile kernel on my system by following this link http://www.ramkitech.com/2012/04/how-to-compile-kernel-step-by-step.html when I run make command, I am getting the following error ...
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868 views

kernel_task cpu usage 300% plus long press power button to start Mac Air

I'm having Mac Air 13inch 2014 having 4 gb memory and 120 gb Hard disk , from the few days i have been facing a problem that kernel_task is taking 300% of my cpu and my mac is running very slow and ...
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539 views

Free space in /boot partition with dependency loop

Summarising my problem is that my /boot partition is almost full but I can't free it up due some dependencies loop. Detailed description: I am running a Ubuntu 14.04.2 LTS which has the /boot ...
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1answer
602 views

Kernel Data Inpage Error

I started getting this "BSOD" error a few weeks ago, and I have no idea how to find out why... It happens at random times and events so I have no idea what's causing it. I did a google search a few ...
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1answer
1k views

openSUSE 13.2 kernel upgrade to stable version (4.1)

I have openSUSE 13.2, and I try to upgrade the kernel to the last stable version. I added http://download.opensuse.org/repositories/Kernel:/stable/standard/ to repository and try to upgrade with ...
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279 views

Where to get the kernel source directory Kali Linux

This is a branch off of this question: Installing new driver on Linux, missing the 'Build' directory Since the PC has no internet I can not use apt-get to rebuild the kernel and get the ...
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94 views

Test program to configure MPLS datapath in Latest Kernel 4.1.3

Latest Kernel supports MPLS datapath in kernel, However there is no test program, or any guide how to write user space program to configure a MPLS datapath in kernel. I browse the kernel code and ...
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1answer
304 views

Kali Linux will not boot from USB, terminal asks for kernel image

I have been trying to boot Kali Linux from a USB. I have turned the USB bootable with the newest 64 bit Kali ISO and Universal USB Creator or whatever it was called, and it seems to have worked just ...
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119 views

ethtool or mii-tool support for kernel 2.6.24

I have a embedded system that has kernel version 2.6.24. I want to use ethtool or mii-tool in this system. I cross compiled ethtool package for powerpc mpc8250 cpu. when i use ethtool, I get ...
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0answers
52 views

Copy On Write will stop working with Docker?

I have been using Docker with great pleasure, but there is a question that concerns me and for what I have found not explanations on the Web. In a "normal" GNU-Linux server, executing different ...
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1answer
34 views

I need to calculate time of booting RPI using Watchdog? Can any one help me please

The boot sequence of the Raspberry Pi is basically this: Stage 1 boot is in the on-chip ROM. Loads Stage 2 in the L2 cache Stage 2 is bootcode.bin. Enables SDRAM and loads Stage 3 Stage 3 is ...
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249 views

OSX 10.9.5 running very slow

I have Macbook Air having Memory 4 Gb and Intel i5 Processor, it is running very slow as no application is opening and if it opens it freezes and its very hard to work over it , I check the Activity ...
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712 views

Mac hangs indefinitely at shutdown

When I reboot my mac running Yosemite, all the applications will quit, the desktop icons disappear, but then the computer hangs indefinitely. The desktop background and dock are still visible and the ...
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234 views

Is it possible to run 64bit kernel on 32bit Linux Mint with NVIDIA drivers?

I have found several forum posts and SE questions (example) where this seems possible, but my attempt has failed. I've tried the following: sudo dpkg --add-architecture amd64 sudo apt-get update sudo ...
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3k views

High CPU - NT Kernel & System, Windows 8.1 Pro 64-bit

I have 64-bit Windows 8.1 Pro, Lenovo X220. All updates are installed (both Windows and from Lenovo Solution Center). Every time my computer starts, one of the processes uses 25% of CPU (until ...
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41 views

Of how mutch importance is it to distinguish between subsystem and subsystem/kernel pair

There is no system but GNU and Linux is one of its kernels It is possible to have a kernel with different subsystems and a subsystem running on different kernels. Some real life examples ...
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187 views

how to fix kernel_task process cpu overflow on Macbook Pro 15inch late 2012

I have a Macbook Pro 15 inch Quadcore 2.6GHZ 1TB SSD, 16GB Ram and Nivida GPU. Lately it crawls to a halt so often because the kernel_task process will eat up to 500% of CPU, even when I'm just on ...
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62 views

Kernel parameter to set framebuffer resolution

What is the parameter to set framebuffer resolution (1920x1080)? With a nouveau driver I didn't have problem with it - now I'm using nvidia (non-free)