Linux kernel

Discussion about the Linux kernel.

scheduler_tick

Submitted by Anonymous
on April 29, 2009 - 5:56am

what is the use or function scheduler_tick in kernel??????????

Has anybody tried doing PCIe to PCIe DMA? will it work?

Submitted by Anonymous
on April 28, 2009 - 1:29pm
Linux

I have been trying to modify some driver code to essentially setup the DMA engine that is on a PCIe card and have it DMA to another PCIe card's memory region instead of the system memory. I am using a machine that has (I think) an Intel X38 Express north-bridge or similar and I believe it is also using ICH9 south bridge.

2.6.9-67.ELlargesmp rip __do_softirq+0x4d/0xd0

Submitted by Anonymous
on April 28, 2009 - 2:53am
Linux

Hello all,

I'm experiencing in some strange troubles. I've an IBM x series server with 4 quadcore intel processors and 22gb of RAM. I'm using RH 4 U6 with kernel 2.6.9-67.ELlargesmp.
This system serves an heavy used Oracle 10g database.

After 1 hours from boot, under have I/O maybe due to a transaction, system seems to hang. dmesg reports:

xfs slow to delete directory trees

Submitted by Anonymous
on April 26, 2009 - 8:23am
Linux

xfs is so slow at deleting directory trees that I wonder if there's some performance problem with the xfs code. I have read this is a known characteristic of xfs, but still, minutes, as in, more than 120 seconds, to delete a few lousy directories containing a mere 370M of files?

[usb] [ehci-hcd] huge number of interrupts when transfering file

Submitted by mbmessaoud
on April 24, 2009 - 11:43am
Linux

Hi

when copying file on a usb disk connected to a mips card there are many interrupts issued

before transfert
# cat /proc/interrupts

CPU0

4: 0 ADI fusiv gpio

6: 4899 ADI fusiv serial

9: 15275 ADI fusiv timer

10: 22261 ADI fusiv timerPulse

13: 33 ADI fusiv eth1

Telnet session consumes 8KB which is never released after session is terminated

Submitted by NilesBor
on April 23, 2009 - 12:46pm
Linux

I am seeking assistance to this memory problem in Linux:

My distro: MontaVista version 2.6.10 (mvl401-ep852)

In "steady state", I execute the "free" command to display info about free and used memory on my system:

> free
              total         used         free       shared      buffers
  Mem:       127396        42884        84512            0            0

Why does the Linux Completely Fair Scheduler degrade the performance of my system?

Submitted by Anonymous
on April 23, 2009 - 4:29am
Linux

My system performance is dropping by a whopping 75% when run with the CFS packaged with Fedora 10. My software runs well on Solaris, Windows, earlier Fedora releases and Centos releases but not on Fedora 10. Note: It is only my best guess that the CFS is responsible for the performance degradation.

Need a process arguments of process which calles reboot to be printed by kernel when rebooting

Submitted by xsanch
on April 21, 2009 - 8:55am
Linux

Hi all,

have a problem, for some reason one of our machines is being rebooted by some process which calles reboot() to reboot machine and we can not figure out what process is doing that :(

User Processes are getting starved

Submitted by sathya
on April 20, 2009 - 11:26pm
Linux

Hi All,

I am developing one router for my own purpose. I have a specific scenario in which my user processes are getting started.

Setup:
=====

H1 ---------------> G1 --------------> G2 -------------------> H2

H1 - Lan host of Gateway(g1).

H2 - Lan host of Gateway(g2).

Please help to configure working kernel

Submitted by Tomas
on April 19, 2009 - 12:49pm
Linux

Hi all,

I'm veeeery new to the kernel building business, please pardon my lameness

I'm building 2.6.30-rc2 kernel from scratch, I've;
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git linux-2.6
$ cd linux-2.6
$ make 0=../build defconfig
$ cd ../build
$ make -j4
# make modules_install
# cp arch/i386/boot/bzImage /boot/bzImage-2.6.30-rc2

hijacking of network subsystem function

Submitted by nagliyvred
on April 19, 2009 - 2:00am
Linux

Hi all, guys!
I'm now writing my thesis to degree at the university. My work is about the covert (or
subliminal) channels in network protocols. The practice part of my
work is to implement such channels and suggest the security mechanism.
I'm a Linux fan and developing it under 2.6.27 kernel.
The problem occured when I tried to use the mechanism of function

KGS

Submitted by Anonymous
on April 18, 2009 - 5:16pm
Linux

If it's made impossible for a buggy or malicious application running on one VT to mess up state or

Also, make sure you remember:

1. Fonts

I have been burned many times by an X server that didn't save/restore font tables properly. VT 1: setfont foobar.psf. VT 8: Do stuff in X. VT 1: the font is messed up.

debug ext4 problem

Submitted by geoffleach
on April 16, 2009 - 7:34pm
Linux

I have a PVR running Fedora 10 with a 250G ext4 filesystem, created when the disto was installed from DVD. The filesystem is used to store OTA HD TV, files on the order of 6-7G, created by an HD HomeRun, an ethernet-based HDTV tuner, capable of creating two files concurrently. I'm running an almost-latest 2.6.27 kernel, from the Fedora binary rpm.

compile kernel as a library

Submitted by Mathieu
on April 15, 2009 - 8:40pm
Linux

Hi,

I am looking for a way to compile the kernel as a library.

Any idea? suggestions?

how to make a bootable uncompressed iso kernel image for linux kernel 2.6

Submitted by Anonymous
on April 15, 2009 - 2:14pm
Linux

Hi,

I am new to linux kernel. I am trying to make an uncompressed iso kernel image for linux 2.6 so that i can load kernel on some i386 emulator like qemu. I know that make bzImage makes compressed image.

can u please tell me if there is any way for building "uncompressed" bootable iso image for linux kernel?

Thanks in advance,
Sunny.