The kernel of operating systems popularly known as Linux, or sometimes GNU/Linux.

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CDC ACM doesn't working in a custom linux kernel

I've a cubieboard2 running arch linux with a custom linux kernel. In the cubieboard2 I plugged in my usb-serial device (like an arduino), the device is recognized as CDC ACM. My linux kernel has the ...
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1answer
12 views

leds-pwm driver in linux 3.8

I am using custom board based on beaglebone black. I am trying to enable leds-pwm driver in Linux 3.8 version. But Kconfig says the driver depends on HAVE_PWM config, I am not able to see that ...
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2answers
18 views

GPIO User Space App

GPIO User Space App describes user space application to test the GPIO. Another related link is Linux GPIO Driver. This would be running on a xilinx zynq board having an ARM Cortex A 9 processor. I ...
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1answer
117 views

show parameters of running kernel

I would like to see with what parameters the running kernel has been started. i.e., I mean those parameters that are specified with the append option, such as ipv6.disable=1 or rootfstype=ext2 Is ...
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18 views

How to cross compile linux kernel for ARM using GNU ARM toolchain? [on hold]

I'm trying to cross compile latest Linux kernel 3.14 for ARM architecture. When I executed - make ARCH=arm CROSS_COMPILE=/usr/bin/arm-linux-gnueabi- The terminal gave me an error that: make: *** ...
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22 views

Good book for tuning/optimizing Linux? [closed]

I am looking for a good book to learn how to optimize/tune Linux, which also explains how/why the recommendations makes the kernel perform faster. I did find this book, Optimizing Linux Performance: ...
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12 views

Modifying CPU Scheduling algo in linux kernel [closed]

I know how CPU Schedulers work in different linux distributions. I want to see the code for this and modify the CPU Scheduling to optimize it for background processes. But I never worked on kernel ...
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48 views

Ping IP works, nslookup fails. New Kernel

I am compiling my own 3.14 kernel. I fear I may have left out some important networking feature to get DNS working. I can't resolve domain names. I can ping my DNS server. I can resolve using that ...
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3answers
49 views

Enabling IP forwarding at kernel compile time

I am compiling a kernel for a router. I know a way to enable IP forwarding in an existing Linux system. At compile time, CONFIG_IP_FORWARD is said to do the same task. I am configuring version ...
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1answer
23 views

How to use a built in driver in the kernel?

I am building the 3.14 kernel for a board that requires the intel e1000e driver. I would like this kernel to have the driver built in so that I can remove loadable module support. I have chosen the ...
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1answer
40 views

Can a real-time process exist in the 'expired' queue of linux kernel?

In the Linux kernel 2.4: Real-time processes are given a priority of 0-99 and they co-exist in the ready queue along with the nice processes (who's priority goes between 100 and 139). But real-time ...
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1answer
35 views

Kernel Panic on 3.14.0-gentoo on an IBM 9228LGA / SMP Stack Trace

So I've spent the past weekend trying to get this IBM Xeon server up and running. I also took this opportunity to try and get a bootable GPT/Grub2/BIOS setup going. I am able to get the kernel ...
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2answers
29 views

Where kernel configuration file is stored?

I currently run Angstrom Linux 2.6.32. I intend to upgrade linux kernel from 2.6.32 to 3.0.7. For this reason, I had to configure kernel 3.0.7 running make menuconfig. Now, I want to compare the new ...
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0answers
41 views

EDID Invalid on USB DisplayLink Device

I have a Sabrent USB to HDMI adapter which is a DisplayLink device. It's recognized by udl as being a DisplayLink device, yet seems to be rejected/disabled due to having an invalid EDID: ...
2
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1answer
30 views

IPsec doesn't read configuration when the tunnel is deleted

I've created a tunnel between tow Sites using IPsec. I've made an error in configuration, the address of the destination was false. I delete this tunnel. But the ipsec try after deleting to establish ...
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2answers
51 views

Change kernel parameters at runtime

While trying to fix an obscure hardware bug, it was suggested that adding a couple of parameters to the kernel might resolve the issue. I can of course do that, but I was wondering whether I can make ...
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33 views

How to apply a patch correctly?

I am trying to patch a linux 3.13.7 source tree to 3.13.8 using the patch-3.13.8.xz file. Since the patch file is in xz format, I used the following command to apply it while in the source tree: unxz ...
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2answers
83 views

How does the system shutdown of a linux kernel work internally?

I have somehow an rough idea of how the userspace and init-system (be it classic init sysV /upstart/ systemd) work at system shutdown. (Essentially there is an order succession of "Stop!", "Please ...
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2answers
29 views

Monitor when read/write on metadata or mmaped files hit the disk

On a server hosting a wide range of websites, I often see IO becoming a bottleneck without being able to identify the processes responsible of IO operations with tools such as iotop, iostat or sar. I ...
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2answers
65 views

System too slow [closed]

My linux system is responding very slowly.I should wait to get the result of my command. How can i investigate to know the problem of his behavior?
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1answer
30 views

How to automate configuration of the Linux kernel build

I'm compiling a flavor of the Linux kernel based on the default configuration (for an ODROID system), with some additional features enabled. I want to automate this process so that I don't have to ...
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1answer
70 views

How to configure bootloader to boot the new kernel?

I succesfully upgraded linux kernel from 2.6.32.61 to 3.0.7 on BeableBoard-xM, following the steps below: download and untar kernel sources 3.0.7 from kernel.org copy kernel sources on /usr/src ...
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0answers
50 views

death_handler: Fatal signal 15 received

I have problem with my Linux when I try to shut it down. init 0 I get the following error: death_handler: Fatal signal 15 received setsockopt recvref[30]: Protocol not available The sytem will ...
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21 views

Interfacing ds1337 RTC on LPC17xx

I am a newbie and I am trying to understand how to interface DS1337(RTC) on LPC17xx Board. This board uses uclinux 2.6.33. .CONFIG: CONFIG_RTC_LIB=y CONFIG_RTC_CLASS=y CONFIG_RTC_HCTOSYS=y ...
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1answer
23 views

Linux Kernel Compile-time options for Seagate IDE drive

I am configuring linux kernel 3.12.14 obtained from linux.org for compiling using 'make gconfig'. My question is what options exactly I need to enable to make it work for my Seagate IDE HDD? I am ...
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1answer
113 views

Can I upgrade my Linux kernel from 2.6.32 to 3.0.7?

I currently run Angstrom Linux 2.6.32 on BeagleBoard-xM (ARM architecture). Can I upgrade my Linux kernel from 2.6.32 to 3.0.7 and what is the difficulty level in case upgrade is possible? EDIT#1: ...
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59 views

Is my understanding of kernels correct? [closed]

System: Application OS: Scheduler, VMM, IPC, FS Drivers, dispatchers, VFS The above would be a monolithic kernel. In a monolithic kernel all core OS functions are separate from user space. Functions ...
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28 views

Choose kernel version in OpenEmbedded

I want to build Angstrom kernel on Ubuntu 13.04 host machine using OpenEmbedded. git clone git://github.com/Angstrom-distribution/setup-scripts.git cd setup-scripts MACHINE=beagleboard./oebb.sh ...
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20 views

Set up OS and Runnig app using x32-ABI

Intro I just moved to a 64bit installation and I'm experiencing big difference in memory usage ( especially for app like chrome, firefox, mysql and java apps ): - While before 4gb were enough now they ...
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16 views

CLEAN CACHE On X86 Desktop Boxes?

I was building 3.12.13 linux kernel and I came across the CONFIG_CLEANCACHE option. it would seems to reduce I/O considerably especially in conjunction with CONFIG_FRONTSWAP. But I want to know if ...
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41 views

String length limit for a kernel module parameter [migrated]

I am passing a string as parameter when loading a kernel module. When the string is > 1024 chars, modprobe results in an error: FATAL: Error inserting mymodule (/lib/modules..): No space left on ...
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45 views

What is the “kernel build”, and where do I get it?

I am trying to compile OpenOnload from Solarflare for my nic on a server that I'm building. It is saying something about not having a kernel build. root@server:/usr/src/openonload-201310-u2# ...
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1answer
25 views

Trouble using `make gconfig` in ubuntu linux

I am trying to compile vanilla Linux kernel 3.12.14 downloaded from kernel.org. When I try make gconfig, it says: * Unable to find the GTK+ installation. Please make sure that * the GTK+ 2.0 ...
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How to find starting point for packet writing in linux kernel [migrated]

I am looking into linux kernel 2.6.39 for Android. I am trying to find out the functions that are called in an order for writing packets from user space into kernel space. I have two questions ...
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1answer
87 views

How to build a custom kernel with localmodconfig that support hardware of multiple machines?

When configuring a server to run a single task, like an appliance, there might rise the need to build a custom kernel. For example to save disk space. Ubuntu Core 13.10 amd64 root filesystem is a ...
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1answer
124 views

How to strip unused architectures, drivers, etc from headers when building a custom linux kernel?

I am building custom linux kernel packages in a Ubuntu 13.10 amd64 environment usingapt-get source linux-image-$(uname -r)the debian way make-kpkg clean;fakeroot make-kpkg --initrd ...
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2answers
142 views

Why does Linux have poor battery life by default compared to Windows?

Is there something inherent to Linux operating systems that makes them poor managers of battery power by default? I would have thought a light distro like Lubuntu would have a clear battery life ...
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34 views

Where is Linux kernel development headed? [closed]

I regularly read development updates from various components of the Linux ecosystem. Of all these, the kernel is the one that seems least transparent to me. Typical kernel release notes mention tons ...
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1answer
55 views

Kernel /proc ipv6 settings precedence

I'm about to connect our network to the IPv6 Internet and need to control the kernel ipv6 settings found under /proc. I know there are configurations for each interface, for all interfaces, and the ...
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2answers
385 views

How exactly does printk work internally?

I know printf needs help from the OS to do its job. I also know printf does not work in the Linux source code as there is no library. And so we have printk for debugging. How does printk work ...
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1answer
36 views

What is CONFIG_BASE_SMALL=0

Looking at the config file of Linux (that is generated prior to build) I found the following line: CONFIG_BASE_SMALL=0 What does it mean? If I want my linux kernel to be as small as possible shall ...
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84 views

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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53 views

How to cause memory fragmentation on a Linux based embedded device?

Hardware ARM What am I trying to do: Answer: I am trying to create memory fragmentation on a Linux 2.6.31 based swapless embedded device. Why: Answer:I am trying to port some patches to Linux ...
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2answers
129 views

BSD Kernel Vs. Linux kernel? [closed]

I wanted to know in technical terms; what is the difference between BSD Kernel and Linux Kernel. In Linux, we can download the source kernel then patch it and make and make modules it. Even we have ...
5
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1answer
114 views

Linux: What is a tainted kernel?

Under certain conditions, the Linux kernel may become tainted. For example, loading a proprietary video driver into the kernel taints the kernel. This condition may be visible in system logs, kernel ...
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3answers
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Why there are many BSD systems but only one Linux kernel?

Why there are many BSD systems but only one Linux kernel? I wonder why BSD was forked many times, but no such thing with Linux.
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61 views

Try to disable console output, console=null doesn't work

as mentioned above, I want to to completely turn off the console output, but putting console= or console=null in the kernel command line doesn't change a thing. When I enque quiet to the kernel ...
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1answer
87 views

How to relate a kernel config setting to the source files?

Here is an example that will explain better: I have a selected the audio driver from the picture and i would like to browse through its source. How do i get to the path of the source files from ...
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1answer
27 views

Does perf includes some “graphing” abilities?

It's possible to create a bitmap or a vector image out of the data collected by the perf profiler under linux ?
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2answers
60 views

“select” vs “depends” in kernel Kconfig

What are the differences in dependencies between select and depends on in the kernels Kconfig files? config FB_CIRRUS tristate "Cirrus Logic support" depends on FB && (ZORRO || PCI) select ...