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 to Disable Linux kernel tracer

I have installed Ubuntu 12.04 (32bit). The current tracer is set as nop. cat current_tracer nop cat tracing_on 0 Although the current tracer is nop and tracing is disabled, all these following ...
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51 views

Atheros AR928X cannot connect to Nokia Lumia Hotspot on latest 4.4 kernel (OpenSuse Tumbleweed)

I've changed distribution from Linux Mint Rafaela to the latest OpenSuse Tumbleweed, and after doing that: my wifi adapter doesn't see anymore the wifi(802.11n) created by the Nokia Lumia phone. ...
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73 views

kswapd uses 100% of one core, no swap in system. Possible _raw_spin_lock kernel bug. No solution for long time

Sometimes kswapd0 uses 100% of one core. This issue happens during all 4.0+ kernels. drop_caches didn't work. Adding swap didn't work. There is no rule when problem appears. It can wait 1-2 weeks. It ...
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1answer
104 views

WD Green Hard Drive and home linux server

Are newer WD Green Hard Drives still a problem for Linux nowadays? The discussion here is focused on home linux servers, not NAS or data centers. Here is a summary of my research from googling. ...
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24 views

GNU/Linux distro with the kernel v3.13 low latency

I am a Linux guy with a 100% free Linux distro sponsored by the Free Software Foundation called Trisquel GNU/Linux (v7) 64-bits. It has the linux kernel v3.13 low latency and I wanted to update the ...
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2answers
75 views

Does a USB drive have head, track etc?

I wrote a bootloader and I need it to be written to a USB drive. Since I am on Windows, my bootloader must support file systems such as FAT32 and FAT16 etc. I have used BPB (BIOS Parameter Block) for ...
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1answer
34 views

does the gcc compiler have any relation with the OS scheduler? [closed]

All is in the title I want to know if is there any relation between the compiler and the scheduler ?
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1answer
108 views

Pressing Alt+Left/Right causes screen flicker

I run Arch Linux with a "normal" Xorg desktop, that is, using LightDM as login manager and the i3 Window Manager (with some components from Xfce, GNOME and KDE as needed). The graphics is the ...
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27 views

welcome to emergency model

After I change the disk partitions and reboot I get this message and can not enter system normally. /dev/sda1 * 2048 10487807 10485760 5G c W95 FAT32 (LBA) /dev/sda2 10487808 ...
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99 views

Why is a dkms module still installed in “dkms autoinstall” after “dkms remove --all”?

I have the flashcache dkms module in /var/lib/dkms/flashcache/1.0-235-g4754b66cfe56. I ran dkms remove flashcache/1.0-235-g4754b66cfe56 --all multiple times, but everytime I run dkms autoinstall the ...
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1answer
77 views

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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120 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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1answer
40 views

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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513 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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1answer
207 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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56 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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0answers
81 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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1answer
169 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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1answer
36 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
46 views

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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679 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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141 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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43 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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5answers
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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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378 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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1answer
172 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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92 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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1answer
104 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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56 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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859 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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3answers
2k views

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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66 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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2answers
781 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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50 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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2answers
105 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
364 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
390 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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1answer
28 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 ...
2
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0answers
140 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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1answer
71 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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901 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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560 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
645 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
2k 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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310 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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98 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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314 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 ...