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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with rlwrap vi file edit not happening

Am using rlwrap,with that history fetch commands editing works fine. But in vi mode am not able to edit the file, and not able to exit from vi mode. I added following entries in inputrc, set ...
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249 views

how to resolve kernel_security_check_failure

I am trying to re-install my Nokia-E5 software by Nokia suite ,I have windows-8.1 OS on my laptop , I am getting this error kernel_security_check_failure . And my laptop restarts. I have no idea how ...
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1answer
3k views

How can I enable kernel crash dumps in Debian?

I want to enable kernel crash dumps for my Debian 5.0.7 machine. The kernel version is 2.2.26 amd64. How can I configure this?
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1answer
371 views

How to combine Ubuntu/Debian kernel config into single config

Ubuntu has split up the kernel configs in the debian.master/config/ directory like this: linux-3.2.0/debian.master/config % tree . ├── amd64 │   ├── config.common.amd64 │   ├── config.flavour.generic ...
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5answers
5k views

Is kernel a process?

In Linux, we always say the first process is init(pid==1). but why is not the kernel(startup) which setup the system and create init process. Is kernel a process? We know all the user space threads ...
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1answer
86 views

Questions about behaviour of running LiveCD Linux after unmounting a CD-ROM

Could anyone explain what happens in system after unplugging CD-ROM during working with LiveCD session? Suppose that I'm using Ubuntu LiveCD and suddenly by accident the CD-ROM disconnect for a ...
6
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1answer
4k views

How do I analyze excessive Windows kernel mode CPU usage?

My Windows XP machine recently started to semi freeze on me every odd reboot after a few minutes of usage (different programs / no additional prg start at all). Update: I have now managed to get a ...
2
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1answer
187 views

Can a kernel that supports multi-core reduce cpu overhead, reduce cpu overheat

I found only a single core as identified by kernel from /proc/cpuinfo. Therefore I am installing a 686 pae kernel to identify all cores and get multi-core functionality. I read about how a process ...
2
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1answer
165 views

Ubuntu: change kernel order

How can I change the boot kernel order in Ubuntu server 13.10? grep menuentry /boot/grub/grub.cfg menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option ...
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2answers
4k views

Allow non-root process to bind to port 80 and 443?

Is it possible to tune a kernel parameter to allow a userland program to bind to port 80 and 443? The reason I ask is I think its foolish to allow a privileged process to open a socket and listen. ...
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0answers
182 views

System frequently hangs/freezes with all processes in D state

When I am browsing the web with chromium (with lots of tabs/images/etc.) or running virtual machines with kvm, occasionally (at least a few times a day) my system will suddenly become unresponsive for ...
2
votes
2answers
168 views

What cache makes a file search faster for the second time exactly?

On Windows on a HDD partition with Total Commander, if I make a file search on the file system root e.g. C:\, it will take considerable time: it display as it walks the entire directory structure ...
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1answer
50 views

Strip Linux for a fixed-hardware system [duplicate]

Apologies if this is not the appropriate place to post! I am designing a minimal Linux system to test on an industrial PC. The ultimate goal is security. The hardware of the PC is known and will not ...
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2answers
573 views

How to keep Linux running after hard drive removal?

I am working on an embedded Linux device with a USB hard drive. There is a swap file on this drive. The hard drive may be powered down at any moment before being powered back on few seconds later. ...
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0answers
1k views

What does this mean: considerRebuildOfPrelinkedKernel prebuild rebuild has expired

A line I accidentally spotted in system.log on MacOS X 10.9.1 when I connected an external USB webcam for the first time ever.... Subsequent connects to the usb port did not produce this message ...
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0answers
38 views

Is it common to get error while kernel compilation?

I was just wondering if its normal getting error while compiling kernel with ubuntu 12.04. (i've already done 2.6.37.3 after solving few errors) Is there any kernel version which will be compiled ...
8
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1answer
558 views

Which files are cached by linux?

I understand that linux uses unused RAM to keep some files cached. But I wonder, which files it actually caches! If you take a look at free : Gesamt Belegt Frei Gemeinsam Puffer Cached Speicher: ...
3
votes
1answer
210 views

How to connect Linux to a HDD that has been “security locked”

In the process of playing around with several hard-drives, and hdparm's --security-set-pass and --security-erase options, I have a pile of HDDs that are in a "locked" state and I cannot unlock them. ...
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4answers
5k views

Error while validating for Ubuntu 12.10 Kernel headers

I have my VMware Player (v 5.0.0 build-812388) all up and running Ubuntu (12.10) from my Windows (Win 7) machine. When I launch sudo vmware-config-tools.pl, it tries to search for kernel Searching ...
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5answers
13k views

How can a linux kernel be so small?

An ordinary stable 3* kernel is about 70 mb now. But there are little linux distributions of 30-10 mb with software and other stuff running out of the box. How can the linux kernel be so small in ...
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1answer
280 views

Linux: Random kernel oops in mmap functions

For the last month or so I've been getting seemingly random kernel oopses. I've started to notice a pattern: from looking at the traces, the call trace always involves mmap functions. Whenever one of ...
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1answer
3k views

What does `apt-get install linux-headers-generic` do

Looking for explanation on apt-get install linux-headers-generic. What does installing linux-headers for a kernel do ? The significance of that command at the time of kernel installation and after a ...
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2answers
426 views

Linux PCIe Physical Bus Address

I am working on designing a custom PCI-Express card. I am trying to write a kernel module that will DMA my custom card. Right now when I plug the card into Linux no valid PCI device shows up ...
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2answers
746 views

How to add a new kernel entry in grub2? [duplicate]

Please anybody help me! I am building kernel from source code downloaded from http://kernel.org. I successfully built it and installed modules. Now i want that my kernel option should come at the ...
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2answers
11k views

Missing linux headers during ATI driver installation

I've updated the kernel on my Linux Mint following this tutorial. But now, when I try to install the latest fglrx, I'm getting this error: Check if system has the tools required for installation. ...
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2answers
27k views

How to disable IPv6 on Debian Wheezy?

I know there's a wiki entry http://wiki.debian.org/DebianIPv6#How_to_turn_off_IPv6 that shows how to disable IPv6 in Debian Squeeze, but that's a 2.6.* kernel. What about 3.2.* kernels running ...
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2answers
296 views

Why will dmesg have message from user space?

you can use dmesg -u to see log from userspace. In my case, I have log from systemd and lvm. Why is this happening, why userspace program can print to kernel buffer ring?
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1answer
168 views

Dmesg boot dumps, udev and boot time

The following is my dmesg dump. [ 1.452016] udevd[121]: starting version 175 [ 1.522976] thermal LNXTHERM:00: registered as thermal_zone0 [ 1.522989] ACPI: Thermal Zone [THM] (76 C) [ ...
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0answers
41 views

Kernel logs and Boot logs

I am trying to analyse the logs of whats happening during boot. Grub config My GRUB_CMDLINE_LINUX_DEFAULT option in /etc/default/grub reads GRUB_CMDLINE_LINUX_DEFAULT= dmesg I have analyzed my ...
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5answers
4k views

Linux distro with just busybox and bash?

I just want a linux distro that boots fast, has a bash terminal (no gui) and busybox. Is there any such distro or is it hard to compile a kernel and just make one myself?
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2answers
118 views

How to understand this messages in /var/log/messages?

the messages is: Dec 18 10:08:55 localhost kernel: sdb: Current [descriptor]: sense key: Recovered Error Dec 18 10:08:55 localhost kernel: Add. Sense: ATA pass through information available Dec ...
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2answers
1k views

How many characters are in one line?

Hy guys. I got a noob question, tried to look on the internet without success. Look the following notice: Linux kernel exceeds 15 million lines of code Now, how many characters are in one line ? I ...
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1answer
61 views

Turn on out of memory killer

I am running ubuntu 13.04 and currently if any user accidently writes some code that uses too much RAM it brings the whole system down so badly I have to switch the power off and on again. Is there ...
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2answers
1k views

How to find out which driver files belong to a certain hardware device like a printer?

On a certain machine I installed a Dell 2355dn Laser MFP printer, now how can I find out what files on the hard drive are used as drivers to access the printer. I assume they must be under ...
0
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2answers
101 views

File POSIX Capabilities

In Linux kernel v2.6.~ there was an option File POSIX Capabilities in kernel configuration, which, in particular, is necessary to build and use Linux Containers successfully. I'm currently using ...
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2answers
161 views

Unable to configure the Linux Kernel v3.8.9 source code

I'm running Linux Mint with kernel version 3.8.0-29-generic. So I downloaded and extracted the Linux Kernel 3.8.9 source code and placed the folder in the main directory. Now using the command make ...
0
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0answers
54 views

Can a driver be compiled alone instead of the whole linux kernel?

I made some changes to the serial driver on my linux machine. I've been trying to compile the module and reload it, but it throws some errors. Instead, if I recompile the whole kernel it works fine. ...
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1answer
723 views

Why are user level threads faster than kernel level threads?

I found out that user level threads are a lot faster than kernel level threads but I could not find any convincing example of WHY is user level threads are faster than kernel level threads ? Could ...
1
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2answers
108 views

Will applications running in root mode be able to overwrite OS's or other program's memory section?

I read here that any application running in root mode can issue a kernel call and execute in kernel mode. Is is possible that ANY application running in root mode can make a kernel call, go to kernel ...
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3answers
70 views

How do I get the latest linux kernel, and why would I want to do that in the first place?

I'm running 3.10-3-686-pae, and I think I would like to upgrade to 3.12 just so I can learn more about how it all works. My computer runs pretty well considering how old it is. I have been learning to ...
9
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7answers
13k views

Any reason not to disable Windows kernel paging?

So I'm planning on eventually going to 2 GB (mobo max) RAM from 1 GB, and I want to disable kernel paging once I do, because I've heard it can give a performance boost (and that I believe). Any reason ...
0
votes
1answer
85 views

Why is my Mac contacting Romania?

I just used Onyx to clean out my caches and log files after which I did a reboot. Browsing the "All Messages" panel of the Console app I noticed this line: 10/27/13 3:38:03.000 PM kernel: ...
2
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1answer
155 views

How to make Linux reliably boot on multi-cpu machines?

I've got two machines, one with 4x12 AMD Opteron cores (AMD Opteron(tm) Processor 6176), one with 2x8 Xeon cores (HT disabled; Intel(R) Xeon(R) CPU E5-2660 0 @ 2.20GHz). On both machines I experience ...
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0answers
7 views

How to approach searching for sources of interface unresponsiveness

On Debian Linux: On a relatively powerful machine I ran an update and both the kernel and the window manager got updated to newer version. At that point the machine become noticeably less responsive: ...
2
votes
1answer
65 views

Which classes of drivers require an ABI bump for Windows 8.1?

I noticed that Windows 8.1 installed a lot of new drivers for several of my devices, but I don't know if that's because there was just an updated one available on Windows Update, or if the kernel ...
1
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1answer
170 views

Where is config kernel file in ubuntu10.10?

I am trying to follow these instructions http://linuxwireless.org/en/users/Drivers/ath9k_htc and it is telling me to edit my kernel config. I don't know where it is.
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3answers
75 views

Are linux driver support at kernel level?

Until now, I thought that linux drivers are at kernel level. That means, drivers are packed inside the kernel, so different distributions should support the same hardware as long as they run the same ...
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vote
2answers
1k views

Linux - prevent disks spinning up

On bootup all disks are spun up, but 4 are just backup (and pretty noisy too). Soo I'd rather prefer to never ever spin them up at all when booting. Is there a kernel option which tells the kernel ...
3
votes
1answer
53 views

On certain Linux boxes, variables in the stack seems to be initialized to 0 - why?

I have a buggy program that pushes a variable onto stack and may use it without initialization. I take the same binary and run it on different Linux boxes. Those boxes have different CPUs (i5, i7), ...
1
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0answers
83 views

linux + squashfs-tools for red-hat 5.3

I want to install the squashfs-tools-4.0-5.el6.i686.rpm But I have the following dependencies ( after RPM installation ) please advice what the additional packages that I need to install on my linux ...