In computing, the kernel is the main component of most computer operating systems; it is a bridge between applications and the actual data processing done at the hardware level. The kernel's responsibilities include managing the system's resources (the communication between hardware and software ...

learn more… | top users | synonyms

1
vote
2answers
486 views

debian kernel upgrade to 2.6.32-5-amd64 but uname still shows 686

I'm try to upgrade a debian system to 2.6 64 bit kernel with the command aptitude install linux-image-2.6.32-5-amd64 which works fine. The system reboots, /vmlinuz -> boot/vmlinuz-2.6.32-5-amd64 ...
1
vote
1answer
4k views

How to force Debian to boot new Kernel?

I'm running Debian 6, Debian GNU/Linux, with Linux 2.6.32-5-amd64 under Grub2 ( 1.98+20100804-14+squeeze1) on a remote system (no possibility to view the pre-boot messages). I compiled and installed a ...
-1
votes
2answers
235 views

server not working smoothly [closed]

Hi I am getting this error message in log. Please suggest something to fix this issue Sep 6 06:19:17 sa1 kernel: sd 0:0:0:0: SCSI error: return code = 0x08000002 Sep 6 06:19:17 sa1 kernel: sda: ...
1
vote
1answer
131 views

ip_conntrack ideal or not for server stability

By default the module ip_conntrack is installed into the kernel. My question is simple, is having ip_conntrack a performance booster for better tracking of connections? On VPS nodes they do not have ...
4
votes
1answer
389 views

Disabling/Enabling Modules Parameter RHEL

I'm working with kernel module parameters, and I've found myself a bit confused. In particular, I'm attempting to enable posix ACL support for XFS file systems. This requires the XFS module to be ...
2
votes
2answers
3k views

How to update from RHEL6.1 to RHEL6.2 ,not RHEL6.3

Now I'm using RHEL version 6.1, and would like to update to 6.2. If I use the command , yum update the OS version become 6.3. so I used the command below yum install kernel-2.6.32-220.23.1.el6 ...
0
votes
0answers
582 views

XEN Domain crash - kernel panic

I have a server with CentOS 5.8.Final, running the 2.6.18-308.4.1.el5xen kernel. I installed the Virtualizorpanel 2 months ago and my VPS are OK, but yesterday one of my VPS crashed. I changed theRAM ...
2
votes
1answer
162 views

What is the best way to get kernel 3.2 on Debian 6?

I'm using Hyper-V as hypervisor and there is a need to use Debian 6 in production on it, but as I know it's not supported. I want to use kernel 3.2 with integrated linux integration components. What ...
1
vote
1answer
420 views

Hotplug area too small error

I have VM running under RHEL6, which is running under HyperV. It has a lot of important soft installed, but does not have suffocating workload (~10% CPU is used). It's been really unstable recently ...
2
votes
1answer
3k views

Windows Server 2008 R2 Kernelbase.dll exceptions

Hi we have a Windows Server 2008 R2 server that has been having issues lately. Right at the same time as most of the issues started happening I noticed that there are lots of exceptions in the logs ...
0
votes
1answer
3k views

Fatal: module iscsi_trgt not found — trying to get my iscsi target to run on debian

Sorry about the formatting below... Linux Microknoppix 2.6.39.3 #21 SMP PREEMPT Sat Jul 23 09:48:39 CEST 2011 i686 GNU/Linux modprobe iscsi_trgt results in FATAL: Module iscsi_trgt not ...
0
votes
2answers
733 views

systemtap not initializing correctly on Ubuntu 12 (Precise)

I work at a firm with a certain amount of legacy batch-processes. Some of that stuff is really leaky when it comes to database connections. I need to log every process in the system, which opens a ...
-1
votes
1answer
291 views

ubuntu 12.04 server comes with Odd Kernel Development version.How can it be upgraded??

I have downloaded latest ubuntu server edition but after installing its showing kernel of 3.2.0-23 Generic kernel,which is a development version. So how can i change to stable release with out ...
0
votes
2answers
305 views

What is the difference between -generic and -virtual kernels?

I am using XEN server 6.0 on machine and I want to install ubuntu 12.04 64bit. I want to optimize OS for running as VM. I choose to install from "http://archive.ubuntu.net/ubuntu/" but its showing ...
1
vote
1answer
130 views

How to package a custom kernel for Debian?

I've build a custom linux kernel from the vanilla source tree using the deb-pkg target: make deb-pkg After that package has been built I've got several .deb files. However I'd like to upload those ...
0
votes
1answer
1k views

An oom killer that I cannot explain

I am not able to understand why would kernel issue this oom killer when I see enough memory is available: I say enough memory is available after looking at Normal DMA Normal free lines This is an ...
0
votes
1answer
366 views

Kernel will not upgrade after installing linux-image on Debian

I am attempting to upgrade my Linux kernel to 3.2 on my Debian server. I have installed the image package, but even after rebooting I still seem to have my old 2.6 kernel. I am assuming I probably ...
1
vote
1answer
465 views

Netconsole not working

I've gotten netconsole setup on a server that's been having a variety of kernel panics lately and I'm trying to log kernel messages to another server. I've tested netconsole after setting it up on the ...
-3
votes
1answer
396 views

Centos 6 ISO with custom kernel

I need to build a Centos ISO with a 3.2 Kernel to setup a new server, how I can do this? The server has a Raid Controller that's not supported in previous Kernel Versions, which means I can not ...
3
votes
2answers
462 views

Tell the linux kernel to put a file in the disk cache?

Is there any command to for a file to be read in and loaded into the linux disk cache? This is on an up-to-date debian system. I know in the general case, it's better to let the linux kernel figure ...
3
votes
1answer
17k views

can high load cause server hang and error “blocked for more than 120 seconds”?

Currently running a few VM's and 'baremetal' servers. Java is running on high - over 400%+ at times. Randomly the server hangs with the error in the console "java - blocked for more than 120 seconds" ...
2
votes
0answers
105 views

Upgrading kernel on Debian server hosting Xen 3.2.1

I have a physical server running Debian 6 and Xen Hypervisor 3.2.1, and kernal -a says "2.6.26-1-xen-amd64". I have not updated for a long time, because when I run apt-get upgrade, one of the updates ...
3
votes
3answers
943 views

Journaled filesystems and power failure

I heard that even a journaled filesystems such as EXT3/EXT4 might corrupted during power failure, e.g. from wikipedia [1]: In the event of a system crash or power failure, such file systems are ...
0
votes
3answers
1k views

Kill processes if high load average

Not so far ago LA on my server raised to 400 and I couldn't even login to server using ssh. Does exists any software, that can prevent this situations by automatically killing processes that making ...
0
votes
1answer
260 views

Linux kernel 3 TCP IP tuning

I found several resources about tuning linux TCP/IP stack parameters in /etc/sysctl.conf for high bandwidth connections, but all refer to kernel 2.6. Does anyone have suggestions about how to tune ...
0
votes
1answer
219 views

ARM Debian (squeeze) USB driver with mismatch 3.3.3 kernel but /lib/modules/2.6.36

Hei guys, my sheevaplug embedded server works fine, but when I wanted to use USB, the device gets not attached to /dev/tty/USB0 lsusb shows correctly: Bus 001 Device 002: ID 067b:2303 Prolific ...
1
vote
2answers
281 views

Solaris: what's a kernel trap?

I'm trying to understand whether the high trap count reported by top on Solaris 10 Kernel: 1659 ctxsw, 1069 trap, 4433 intr, 3837 syscall, 5 fork Memory: 8192M phys mem, 299M free mem, 4103M total ...
1
vote
1answer
415 views

Networking / Multipath dropping

I'm having problem with few linux boxes running xen. They are acting as hypervisors and they are connected to SAN using multipath setup to provide storage to guest vms. Every now and then one of two ...
2
votes
0answers
197 views

Monitoring Linux Kernel Space Processing

I'm running two "services" that are served in linux kernel-space: Linux Netfilter Firewall ("iptables") Linux Virtual Server Loadbalancer ("IPVS", "LVS") Now I want to (performance-)monitor my ...
3
votes
1answer
570 views

Kernel appears to have no modules

Useful info: OS: CentOS 5.8 final Kernel: 2.6.32-042stab056.8 My kernel came prebuilt with the server, I don't know anything about kernels and not a lot about linux however as far as I do know I ...
3
votes
1answer
540 views

What is shrink_slab, and why is it showing up in /var/log/messages?

I'm investigating some application issues on a Linux system and noticed this around the time of the most recent problem, but not close enough to be definitively related: Jun 7 17:51:49 localhost ...
0
votes
1answer
160 views

ss utility does't work properly

I've learned that ss, which is base on netlink, is much faster than netstat when amount of sockets is large. And the secret is here. But when I tested on my suse linux minutes ago, the result ...
0
votes
1answer
817 views

How to avoid syn cookies

I've got a (TCP) server that handles a big number of new connections per second (1000 - 5000). This causes syn cookies to be send: kernel: possible SYN flooding on port 2710. Sending cookies. Syn ...
0
votes
1answer
244 views

Debian and Kernel Versions

Debian is running 2.6.32-5. Recent kernels seem to have addressed some kernel soft lockup issues, I'd like to try them. Although... the patches don't seem to be in the Debian-stable repository. # ...
1
vote
1answer
112 views

Compiling Linux kernel “correctly”

Recently I have come across a security module for the Linux kernel called Linux-VServer which allows you to virtualize many things and "partition" the OS to reduce the effects of a compromise. I was ...
1
vote
2answers
2k views

server running out of memory

the server is running out of memory and get to the point where it starts killing the process, the total PSS memory(actual memory used from the Resident memory) consumed by top using applications is ...
2
votes
1answer
216 views

Two server freezes with in two weeks

Two consecutive server freezes with in two weeks. We are running ubuntu 11.04 64bit on Intel(R) Xeon(R) E5620 @ 2.40GHz with 48 Gb RAM on 2.6.38-13-generic kernel dedicated server. after making ...
-1
votes
2answers
371 views

Can it be because of any Kernel Bugs?specifically spin lock

We are running ubuntu 11.04 with 2.6.38-13-generic kernel on Intel(R) Xeon(R) CPU E5620 @ 2.40GHz with 48 GB RAM dedicated server with Hardware RAID. top command output is showing many kernel ...
2
votes
1answer
3k views

What is oom-kiler and why is it happening ? Should I avoid it?

I have a server that is now having "invoked oom-killer" many times a day ! I never saw that and even after reading tons of forums on Internet I'm still puzzled : is it a big problem ? Why is it ...
0
votes
1answer
92 views

OpenAFS on OpenVZ guest

I'm trying to install and configure an OpenAFS server inside an OpenVZ container. However, when running afs-newcell, it complains that the AFS client cannot be started. It says "AFS module ...
1
vote
4answers
1k views

rtl8139 driver in modern linux kernels - is it included?

I need to support the realtek rtl8139 network card - is this included in modern (> 3.0) linux kernels? do I have to load any modules or install anything?
1
vote
0answers
281 views

Ubuntu - random reboot since 3.0 kernel

I have an Ubuntu Server that is now upgraded to 12.04 LTS server. Ever since I've upgraded from 10.10 to 11.04, when the kernel went from 2.6.38 to 3.0.anything, my machine would constantly randomly ...
3
votes
1answer
1k views

Redhat Linux Kernel what does GA mean?

When Redhat release a new major version such as 5.3, 5.4,5.5 .. the kernels seem to be referenced as GA , what does GA stand for ? example in this info doc ...
0
votes
0answers
148 views

which `install.sh` does `make install` use?

I am trying to learn what make install does in the context of building a custom kernel. (reference: ...
0
votes
2answers
1k views

Compiling linux kernel - `make install` asks for LILO. Now what?

So I am following this guide to compile my custom kernel - http://library.linode.com/linode-platform/custom-instances/pv-grub-custom-compiled-kernel#sph_compile-and-install-the-kernel So far so good, ...
1
vote
1answer
478 views

What could cause a sudden extreme increase in io load on my postgres database server?

I have a postgres server running since years and the load have been more or less constant (load average around 0.5-5). Yesterday it reached an average of 110! It is a virtual server running Debian ...
1
vote
0answers
154 views

Find counts of ulimit quotas

So, we may have some sort of zainy leak in our software. We're using Mono and spawning many processes over the course of weeks/months. Eventually, we can't spawn anymore on our clients machines. It ...
0
votes
1answer
492 views

E: Sub-process /usr/bin/dpkg returned an error code (1)

I'm getting an error while trying to update the linux-image-2.6.32-5-amd64 package on Debian 6, x64. Setting up linux-image-2.6.32-5-amd64 (2.6.32-41squeeze2) ... Running depmod. Running ...
2
votes
2answers
330 views

named gets killed

Every once in a while, my server will kill named. This gets logged: Apr 16 17:00:08 li127-203 kernel: Out of memory: Kill process 15723 (named) score 38 or sacrifice child Apr 16 17:00:08 li127-203 ...
2
votes
1answer
926 views

HP ProLiant Support Pack (PSP) creates multiple grub entries

After installing HP's PSP 8.73 on RHEL5 with a G7 Blade, I end up with 4 grub entries 1 The Standard RHEL 2 HP (choosen as default) 3 HP hpahcisr 4 HP mptlinux I'm confused as to why I get all ...