Everything about UNIX kernels: development, configuration, compilation, design, etc.

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Looking for a list of modules that are used during boot sequence

I'd like to use deferred init calls. This function allows to load modules in userland, that should actually be loaded during the boot sequence. Just for testing I'd like to modularize as many entries ...
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298 views

D-Link usb dongle detection problem [ Debian Wheezy ]

according to this topic,I was upgrade kernel from 3.2 to 3.12 (using .deb backport),But at installation process I get some error message like this : # dpkg -Ri kernel3.12 Selecting previously ...
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300 views

How to disable PAE feature of kernel, after installation?

I am using RHEL 5.3(x86) as a base platform for my development purpose.My machine's spec is as follows: Intel, Core-i3 Processor @ 2.5GHz 4GB RAM Problem is whenever I am attempting to install the ...
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47 views

Patching the kernel source through git

I'm trying to understand how the patching of the kernel source works. I found the patch that I would like to try an apply on the following page. I found no .patch files that I can use to apply the ...
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kernel 3.1x and optimus support

I have encountered a negative observation regarding bumblebee. Namely, using optirun the performance of the GPU seems to be an order of magnitude lower than it should be. To be more specific: I have ...
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1k views

Qemu: No file system could mount root (unable to mount roofs)

In Linux, I've created the root file system (rootfs) by following commands: dd if=/dev/zero of=ramdisk.img bs=1M count=4 mkfs.ext2 ramdisk.img sudo mount -o loop ramdisk.img rootfs sudo cp init ...
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157 views

Kernel IPsec SA database: FIFO instead of LIFO

When processing an IP packet, the kernel looks into the security policy (SP) database to determine whether it is to be protected with IPsec. If the identifiers of the packet (e.g. IP addresses, etc.) ...
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229 views

Virtual address of Global variables in Kernel code

If my understanding is not wrong, every process has a Kernel Address space associated with it (which is typically 1GB). As far as local variables are concerned, they are assigned on the kernel stack ...
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91 views

configure allowed_tcp_congestion_control via config files in linux kernel

I am trying to come up with a custom set of TCP congestion control variants as part of the tcp_allowed_congestion_control. I do have multiple variants on my tcp_available_congestion_control list but ...
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105 views

Decreasing mouse sensitivity at kernel level

I have developed a custom-GUI Server, which runs on virtual console of Linux.For mouse-handling purpose, it reads the mouse device file /dev/input/mice and retrieves the event data and updates ...
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250 views

Pinnacle TV tuner card, readreg error, dvb_register failed, cx8802 probe failed, firmware never loads

I'm trying to make this card work in a touch screen kiosk running Ubuntu 10.04, kernel 2.6.32-45-generic This card seems to use the s5h1411 chip instead of the s5h1409 the modules are expecting. I've ...
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792 views

Lowering kernel timer interrupt frequency

When I run my Virtual Machine with Gentoo as guest, I have found that there is considerable overhead coming from tick_periodic function.( this is the function which runs on every timer interrupt).This ...
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Intel Core i3/i5/i7 Sandy Bridge CPU throttling

Intel Sandy-Bridge family i5 Core CPU, running Linux kernel 3.2 (Debian Squeeze/Wheezy), under heavy computation load, does not react to to cpufreq-set -g powersave (using acpi_cpufreq module). It is ...
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551 views

Unusual vmware.modconfig-console output

Upon running a batch file I created to iterate recursive directories from / trying to find the Kernel headers for vmware-modconfig-console running on openSUSE, when it comes across /usr/include/ it ...
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507 views

Make and apt-get Have Stopped Working

So I downloaded the non-free broadcom driver(b44) for my debian install, however when I try to make it I get the following error: make make -C /lib/modules/2.6.32-5-amd64/build ...
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107 views

Change terminal resolution on Whiite (Wii Linux)

Is there a way to change the terminal resolution in Whiite (Linux for Wii)? All the answers I can find suggest editing grub configuration, but Whiite uses a custom bootloader instead of grub.
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167 views

BackTrack5 R2 video driver works, but presents disturbing error message

I've installed backtrack 5 R2 on my computer and everything works fine but the video driver. The solution described here does work, but whenever I start the graphics mode, a message saying that the ...
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702 views

Install CentOS in a VirtualBox to a Compact Flash and use it on a mini PC

I got into a very specific situation and want to get to know your opinions. I have got a mini PC with Intel Atom processor which should run CentOS with an upgraded kernel to 3.x and some ...
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227 views

memtester runs faster after couple of runs

I am using this test tool : http://pyropus.ca/software/memtester/ And I noticed that first 3 iterations take 4 hours but 30 iterations take only 12 hours. I was hoping that 30 iterations will take 40 ...
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647 views

Linux thin station

I have this pc that I just installed and set it up as Linux thin station. I did all the formatting procedures and copying of image to the HD. When I boot it up, I get these, which I think are driver ...
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72 views

Mouse pad error after new Linux kernel install

Yesterday I upgraded my debian laptop with the backports repository. Amongst the packages it installed, a new kernel was added (3.2.0). When booting on this kernel, the right-click on my mouse pad (is ...
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236 views

Install an app made for SUSE Enterprise 11 on openSUSE 11.4

I'm trying to see if I can install Symantec System Recovery 2011 Linux edition on an openSUSE 11.4 system. According to the docs, SSR 2011 for Linux supports (among others) SUSE Linux Enterprise ...
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492 views

How is the Linux kernel stack organised for ARM architecture?

Can any one explain how exactly linux kernel stack organisation is handled? When a child process is created using the fork() system call, how is the kernel stack space initialized?
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Linux + what are the steps use the oldest kernel version in place of the current

I have Linux red-hat 5 version I want to reboot the machine with the previous kernel - 2.6.18-408.el5 so I set the default to 1 but before I will reboot the machine to startup with the older kernel ...
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Kernel bug at at fs/dcache.c on XenServer

Yesterday on of our servers running Xen 6.5 restarted, in /var/log/messages I found following messages: Apr 29 11:52:59 server kernel: [7476681.051566] ------------[ cut here ]------------ Apr 29 ...
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How do I enable higher C-states on Xeon 1505m with Linux?

I am running a Lenovo ThinkPad P70 with a Xeon E3-1505M v5. Installed the 201604 Arch, most everything is running well, except power states. The kernel I'm using is 4.5.1-ARCH, but I've also tried 4.6 ...
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How do I compute the angle of the 2D 3 points ? [[ In kernel space]

I 'm looking at the touch driver 's Kennel. Sometimes a touch is bouncing County singah appear. Collected by recruiting three points 'm trying to calculate the angle between . But there is no such ...
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25 views

Kernel problem after upgrading to 4.5.1

I updated my kernel from 3.19 to 4.5.1 (which is the latest ubuntu-based upgrade), and when I rebooted, I saw an alert: Alert! /dev/disk/by-uuid/xxxxxxxxxxxxxxxxxxx does not exist! where x's are ...
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12 views

ALG IPSEC and RSTP

I have linux 3.18. my Linux is installet on a router. in this router I activate a NAT from the wan side. Does this Linux support ALG of IPSEC and RSTP ?
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18 views

Installing Wireless Adapter (GWU625 v1.1) On Modern Fedora OS

I am trying to install the driver to GWU625 v1.1. You can download it here for what it is worth. It is recommended for Fedora v10 but I want a to run an OS which is supported by the people who ...
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26 views

m2c : Command not found

I want to experiment on DCTCP protocol. For that I am trying to compile linux kernel version 3.2.18 and include a dctcp patch for that. I am following the directions given here. While I am compiling ...
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minimum time between two consecutive UDP packets

I am interested in developing a C application which sends UDP packets with minimum delay between two consecutive packets. Is it possible to "book" the UDP stack with the NIC hardware from user space ...
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it terms of terminology is there an accepted difference between a kernel agent and a kernel module or a kernel driver?

In terms of terminology is there an accepted difference between the concept of a kernel agent, kernel module, or a kernel driver?
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55 views

dracut-initqueue: Could not boot, /dev/disk/by-uuid does not exist

I've just installed second linux kernel on my machine and after the boot, I'm getting following error: dracut-initqueue: Could not boot [Warning] ...
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Kernel make install error for RTAI 3.8 on CentOS 6.5

Before posting I have read almost every similar post I could find on this and other websites but I haven't found an useful answer. I have to install a custom software that needs RTAI 3.8 on top of ...
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Mouse button stops working intermittently

I have noticed that I'm not the only one with mouse button problems. This problem seems to affect multiple users on many different Linux versions regardless of Desktop versions (at least in Unity ...
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Raspbian Kernel Oops at fs/dcache.c

We have a Raspberry Pi 2 running Raspbian 8 Jessie. We are running a simple Python 3 based Flask server to read from GPIO pins and toggle a relay (Externally powered). This system is polled every ...
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23 views

GMA500 video chip uses mode that monitor can't sync to (even text mode)

I have a new CentOS7 installation which starts fine (I see the Grub2 menu). If I disable RHGB I can even watch bootup to a point - then all video disappears. The OS is booting to runlevel 1 (text ...
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23 views

Dynamic mdev ifup and ifdown of network interface

Is it possible to have an mdev.conf rule that would run ifup on device creation and ifdown on detach? i.e. eth[0-9] root:root 660 @ifup $MDEV | $ifdown $MDEV
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37 views

Kernel panic dump analisys

We got a kernel panic today and I think that one scsi device caused it. Can you help me to interpret this output? What does <<EOE>> mean? <0>Kernel panic - not syncing: Watchdog ...
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17 views

ip_local_port_range kernel parameter confusion

On my system we have following setting: [root@voip ~]# cat /proc/sys/net/ipv4/ip_local_port_range 32768 61000 We have asterisk running on it which is using RTP port range 12000-13000 in case we ...
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35 views

Help debugging a kernel oops

My system has been freezing up for a while, and I keep seeing this particular kernel oops: syslog. Xorg.log Here's another similar crash from a few months ago. syslog Can you help me debug this? How ...
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54 views

Kconfig (bool/def_bool/tristate)

In a Kconfig file, what are the differences between : bool def_bool tristate Thank you.
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26 views

perl script stall nanosleep() call in strace output

I have perl base SIP client which calling for SIP REGISTRATION process but i am seeing it stall for 10 second at nanosleep() call send(4, "REGISTER sip:sip.example.com S"..., 513, 0) = 513 select(8, ...
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What is the role of these RPM packages( kernel-debuginfo and kernel-debuginfo-common RPMs, and the kernel-devel RPM)?

I want to know what the role of these RPM packages( kernel-debuginfo and kernel-debuginfo-common RPMs, and the kernel-devel RPM)?
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How to interpret some kernel OOPS output?

I'm trying to analyze some kernel OOPS message. I'm able to understand most of the output, but there's still some lines that I have no idea how the should be interpreted. The first thing is PGD which ...
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38 views

How does vfs_write decide to aio_write of which file system?

We know that sys_write call vfs_write that ultimately call fs->f_ops->aio_write.But how does kernel know which filesystem's aio_write call back function to call?? Moreover I have noticed that ...
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45 views

What's different between logical block and physical block?

I know the logical block is viewed by kernel, and physical block is viewed by disk controller. Then, Where the file system like ext3's block is related? Is this logical or physical? I think file ...
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RAPL PMU detected, API unit is 2^-32, 4 fixed counters 655360 ms ovfl timer

I compiled my own kernel (version 4.1.5) using the commands: #emerge --ask sys-kernel/genkernel #genkernel all And then I installed grub2 using these commands: #emerge --ask sys-boot/grub ...
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70 views

Manually move kernel image to /boot directory

I have compiled my own kernel on Gentoo (following the handbook) and then I have moved the bzImage to /boot/vmlinuz-4.0.5. But when I boot the system I get the Grub2 shell. What am I doing wrong? ...