Tagged Questions

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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1answer
86 views

Ubuntu kernel upgrade after graphic card driver update

I use Ubuntu 12.04 with an ATI Radeon 5450 graphic card. I use 2 monitors, and I had to update the video driver because the default one doesn't remember its settings after reboot. I have found out ...
0
votes
1answer
207 views

Linux benchmark SSD vs HDD

I wonder if there is any performance difference when using SSD as the main Hard drive rather than mounting it to be used by different applications on the server. For example using a command line ...
0
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0answers
27 views

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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vote
0answers
235 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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votes
1answer
73 views

On telnet session file edit not happening using vi editor

I used rlwrap because with telnet session arrow keys were not working, after starting telnet session with rlwrap am not able to edit the file in using vi editor. Whether its problem with rlwrap.If i ...
2
votes
1answer
166 views

What is the rationale behind the default values for adjtimex --adjust?

The adjtimex utility has an --adjust mode that can be used to compare the system clock with the CMOS clock, calculate suggested values for the tick and frequency offset kernel time variables, and ...
1
vote
1answer
85 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 ...
3
votes
2answers
6k views

Why Centos still not using Latest kernel

As i have seen many changes and improvement in kernel 3.xx The improvement i like is dmcache which introduced in kernel 3.9 I have 3 server with centos installed on all machine Centos is still ...
2
votes
1answer
182 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
votes
1answer
155 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
2k views

Ubuntu Server 13.10: How to downgrade kernel

Ubuntu Server 13.10 appears to be very unstable, I got random crashes of the system with no apparent reason and nothing is showing in syslog. This is screenshot from the console when the crash ...
7
votes
2answers
3k 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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votes
0answers
173 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 ...
0
votes
1answer
49 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 ...
0
votes
1answer
750 views

Compile the kernel to increase the command line max length

Following up on http://stackoverflow.com/questions/14176089/system-command-line-max-length-in-perl, which say the max length for exec/command line arguments is controlled by ARG_MAX. So I want to ...
1
vote
0answers
995 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 ...
0
votes
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
votes
1answer
487 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: ...
1
vote
1answer
262 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 ...
1
vote
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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votes
2answers
644 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 ...
3
votes
2answers
272 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?
0
votes
1answer
160 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) [ ...
0
votes
0answers
40 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 ...
0
votes
2answers
109 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 ...
2
votes
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 ...
0
votes
2answers
152 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
votes
0answers
84 views

cifs mount failed with return code 13 after building kernel 3.12.1

I was using the PING.ISO (Part Image is not Ghost) 3.02. The ISO is a simple file structure with all the work being done in a python script. I needed drivers for a newer PC, so I remastered it with a ...
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3answers
2k views

Logitech M560 mouse on linux sends messed up input events

My friend bought yesterday a Logitech M560 mouse (you can see it here) and tried it on her Ubuntu system. It seems to be a relatively new model, so there is no info about it anywhere, except for ...
0
votes
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. ...
1
vote
1answer
668 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 ...
0
votes
3answers
69 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 ...
1
vote
2answers
105 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 ...
2
votes
2answers
137 views

Can linux kernel be installed alone without any other existing OS

Hi I am newbie to linux world. I have just downloaded the latest kernel from kernel.org. I want to install this simple kernel into my PC(my PC is formatted and has empty hdd). Can I do that? if so, ...
1
vote
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: ...
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
votes
1answer
149 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 ...
2
votes
1answer
63 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 ...
3
votes
4answers
272 views

Is the Windows kernel considered an “application”?

If it is true that all Windows files with the ".exe" file extension are considered "applications", is NTOSKRNL.exe, the Windows kernel, an "application", or is this an exception to the rule? What ...
0
votes
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 ...
2
votes
1answer
441 views

Problems with mounting HFS+ drives

I have a problem mounting some hfsplus drives. I just need them mounted readonly. (disabling journal is not an option) I did a lot of research and found out that due to changes from kernel version ...
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
vote
0answers
79 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 ...
0
votes
2answers
102 views

Why do linux kernels include files for all devices?

The kernel for my device includes so many files for other devices and situations that my device cannot use. The kernel carries around the files for everything and is much bigger than just the files ...
0
votes
1answer
162 views

Mouse stops moving after a every few seconds, but revives after click action

I am using Arch Linux and according to "uname -r" my Linux Kernel Version is 3.10.10-1-ARCH. This problem appeared after a full system update recently. Any idea how to fix this? Thanks in advance ...
3
votes
1answer
2k views

Adding system call to kernel 3.11 [closed]

What I want to do is add a dummy system call to the 3.11 Linux Kernel. What I did: Downloaded and extracted kernel v3.11 from kernel.org and placed it in /usr/src In file, ...
2
votes
1answer
174 views

Linux kernel option to force video card to stay on

I just installed Debian Wheezy 7.1.0 on an Intel vPro System (Intel Core i5-2520M, SuperMicro MBD-X9SCV-Q-O). Intel AMT's KVM works perfectly until Debian has completed booting and shows the login ...
0
votes
1answer
58 views

Is the source code for OS X kernel logging messages available via XNU, or is it “proprietary.”

It would be kind of nice to understand just exactly WHAT all those messages that appear in log files really mean. I'm not necessarily talking about errors, but even informational messages. I realize ...
1
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 ...
2
votes
1answer
403 views

Kernel bypass possible with non-specialised NIC?

Is it possible to perform kernel bypass and have a NIC send data to the user space (where I will write my network stack) with no copying, without having to purchase a specialised Solarflare etc NIC?