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 ...

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drivers/rtc/hctosys.c: unable to open rtc device (rtc0) after recompile on boot

After recompiling a new kernel on CentOS 6.3, using the same kernel I have been using on several other machines, I am getting a kernel panic on two machines. I get the following when trying to boot: ...
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1answer
337 views

Realtek R8168 network driver 8.034.00 not compiling under CentOS 5.8 64-bit [closed]

I'm trying to compile Realtek R8168 driver 8.034.00 on CentOS 5.8 64-bit and I got this: make -C /lib/modules/2.6.18-308.16.1.el5/build SUBDIRS=/r8168-8.034.00/src clean make[1]: Wejście do ...
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1answer
138 views

EC2 kernel decision and issues with creating a new machine with my AMI

I could really use some advice. I started a new instance on EC2 using Amazon's AMI and during the deployment process I selected a Kernel ID of "Use Default". I then configured my server the way that ...
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3answers
914 views

“postgres blocked for more than 120 seconds” - is my db still consistent?

I am using an iscsi volume on an Open-E storage system for several virtual machines running on a XenServer host. Occasionally, when there is a very high disk I/O load on the virtual machines (and ...
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1answer
465 views

Issue with kernel boot [OVH SERVER]

Trying to install OpenVZ kernel on Centos 6.3, Yes my kernel is installed i can see it in the /boot folder, yes it is Rhel6 and yes it is all up to date, i checked this with yum update. My issue ...
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2answers
1k views

FreeBSD Listen Queue Overflows - can't increase max queue size

I have a decently high trafficked FreeBSD Nginx server, and I'm starting to get a large number of listen queue overflows: [root@svr ~]# netstat -sp tcp | fgrep listen 80361931 listen queue overflows ...
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2answers
398 views

Refresh /dev/sdx list

I've been messing around with my storage array (in that case 2xMD3000 SAS) and between the scans/rescans/delete/add my /dev/sdx block devices are all messed up. Some of them are non existent and using ...
2
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1answer
397 views

Linux Kernel IRQ Routing with irqbalance / kernel options

I'm trying to get my Xen Dom0 distributing the irqs in an smp enviroment. As far as I know there are 2 Options: Use irqbalance Configure the kernel without cpu hotplug support My System is Debian ...
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0answers
175 views

what does setting kernel.shmall too high do?

I'd like to know what the kernel does when the value of kernel.shmall works out to being larger than the total amount of available memory (main memory + swap space). Is the value ignored and the ...
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2answers
407 views

yum update kernel without removing old?

When I yum update it wants to remove the oldest of the 3 kernel I have and upgrade to a new. Is it possible to get yum not to remove old kernels?
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1answer
1k views

Scientific Linux won't boot after yum updates kernel

I just updated kernel for my Linux: [root@localhost ~]# cat /etc/redhat-release Scientific Linux release 6.1 (Carbon) [root@localhost ~]# uname -a Linux localhost.localdomain ...
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2answers
540 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 ...
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1answer
5k 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 ...
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2answers
256 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: ...
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1answer
133 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
418 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 ...
3
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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 ...
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0answers
619 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
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1answer
164 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
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1answer
431 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
4k 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 ...
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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 ...
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2answers
774 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 ...
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1answer
293 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 ...
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2answers
348 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 ...
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1answer
138 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 ...
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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 ...
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1answer
414 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
518 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 ...
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votes
1answer
405 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
553 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
19k 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
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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
1k 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 ...
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3answers
2k 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
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1answer
265 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 ...
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1answer
221 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 ...
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2answers
298 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 ...
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1answer
436 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
207 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
665 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
558 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 ...
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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
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1answer
841 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 ...
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1answer
252 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. # ...
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1answer
114 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 ...
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2answers
3k 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
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1answer
218 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 ...
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2answers
378 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
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1answer
4k 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 ...