The kernel tag has no wiki summary.
1
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1answer
30 views
How any routing protocol packet reaches(flows of operations) from NIC card (physical layer) to any Routing (OSPF/RIP/BGP) daemon?
The problem is rearding the routing protocol packet flow in any linux/unix device where multiple routing protocol daemons are running.
How any routing protocol packet reaches(flows of operations) ...
2
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0answers
64 views
Improving TCP performance over a gigabit network with lots of connections and high traffic of small packets
I’m trying to improve my TCP throughput over a “gigabit network with lots of connections and high traffic of small packets”. My server OS is Ubuntu 11.10 Server 64bit.
There are about 50.000 (and ...
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2answers
51 views
Issues debugging a kernel panic (custom kernel)
I'm looking to compile a custom kernel from the official source tree (kernel.org). The machine itself runs the latest stable RHEL kernel without issues but I can't seem to figure out why it's ...
0
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1answer
35 views
Understanding “forward” in linux
Which part of the linux is responsible for "forwarding" traffic between interfaces?
I know about "/proc/sys/net/ipv4/ip_forward" but which part of OS, kernel or a module is actually checking this ...
0
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0answers
12 views
Any way to immediately free a bound socket? [migrated]
I’m developing an application server, during which I constantly edit–recompile–rerun the code. Unfortunately, after interrupting the code, the kernel (Ubuntu 11.10) does not immediately reclaim the ...
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0answers
28 views
Server is crashing - kernel panic - screenshot
Can anyone decipher whats going on in this screenshot : http://i.imgur.com/pJ8FV.jpg
My server keeps going down, my host rebooted it and took a photo of the monitor for me
Server config:
AMD 945 x4
...
0
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0answers
18 views
kernel compile error with make menuconfig [migrated]
# make menuconfig
HOSTLD scripts/kconfig/mconf
/usr/local/bin/ld: scripts/kconfig/lxdialog/checklist.o: undefined reference to symbol 'acs_map'
/usr/local/bin/ld: note: 'acs_map' is defined in DSO ...
0
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1answer
48 views
Is this a memory failure being logged (CentOS web server)
$ sudo tail /var/log/messages
Jan 30 13:47:58 www kernel: EDAC MC0: CE row 3, channel 0, label "": Corrected error (Socket=0 channel=1 dimm=1)
Jan 30 13:47:58 www kernel: EDAC MC0: CE row 3, channel ...
1
vote
1answer
105 views
debian package to ko file
I have downloaded hp-be2net_4.0.359.0-2_all.deb package which is used for NIC driver for linux.
I installed the above package using below command
dpkg --install hp-be2net_4.0.359.0-2_all.deb
Then ...
1
vote
3answers
78 views
Reloading a kernel “live” in CentOS / RHEL 6
When upgrading the kernel package on CentOS or RHEL 6, is it possible to load the new kernel without rebooting?
My gut tells me it's not, but if it were, it'd be handy - especially when compiling ...
3
votes
1answer
27 views
What is the way to update /lib/modules after copying disk to a different system?
I have transferred the disk of a a Hardyvirtual machine to another virtual machine with a different kernel but there is no equivalent of /lib/modules// on disk. How can the /lib/modules of the new ...
0
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1answer
131 views
Kernel Panic - not syncing :Attempted to kill init
I am facing this problem on my Debian5. I am running this server in Virtual Box.I have four os in this machine. But in this server only I get this message when I boot .
run init: /sbin/init : ...
0
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1answer
38 views
Debug kernel booting to blank screen
I have a machine which works fine with the precompiled 'generic' ubuntu kernel (3.0.0-13) but when I try to boot up the precompiled 'virtual' ubuntu kernel (3.0.0-13) it just puts me on a blank screen ...
1
vote
2answers
71 views
Kernel Printk: xx message suppressed
Hi I have a watchguard firewall, and I lost access to the firewall before xmas, therefore I visited the site, upgraded the firewall to the latest firmware but unfortunatly, I am now having similar ...
1
vote
1answer
110 views
Upgrading linux-headers-server and linux-image-server fails
apt-get upgradetold me that packages linux-headers-server linux-image-server were kept back, and thus this answer lead me to run apt-get install linux-headers-server linux-image-server.
However, the ...
-3
votes
2answers
71 views
Error in Virtual box with RHEL 6
While using Virtual Box in RHEL 6 at the time of starting virtual OS getting following error. Help me to resolve this.
Virtual Box version VirtualBox-4.1-4.1.8_75467_rhel6-1.i686
Operating System ...
2
votes
2answers
81 views
mkfs refuses to format device in the claim it's mounted when actually it is not
This is the problem:
root@ip-10-126-247-82:~# mkfs.ext4 /dev/xvda3
mke2fs 1.41.14 (22-Dec-2010)
/dev/xvda3 is mounted; will not make a filesystem here!
And this is the debugging:
...
1
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2answers
124 views
task blocked for more than 120 seconds
I'm getting a lot of stuff like this on my ec2 instance:
kernel: [141720.410047] INFO: task kjournald:14019 blocked for more than 120 seconds.
kernel: [141720.410205] INFO: task flush-202:112:2005 ...
5
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2answers
123 views
Kernel updates without rebooting
Similar to some of the topics touched on in this question, Rebooting servers for kernel updates, I was curious if there was a way in which one could apply kernel updates to the system without ...
0
votes
1answer
155 views
error: “net.ipv4.netfilter.ip_conntrack_max” is an unknown key
I have a problem on Ubuntu 10.04.3 LTS x64 with sysctl net.ipv4.netfilter.ip_conntrack_max
. If I run this command on shell, I get back an error:
error: net.ipv4.netfilter.ip_conntrack_max" is an ...
1
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0answers
79 views
Does TIME_WAIT affect dynamic ports?
I've read a bit about TIME_WAIT connections, and know they should be harmless to my server (connection closed, so no resource connected with this socket).
Recently, my server reached the magic ...
12
votes
2answers
290 views
What is the largest hardware clock update the Linux kernel “11-minute mode” can make?
When certain time-related programs (like ntpd) are running on a Linux system, the kernel will switch into so-called "eleven minute mode" (see the hwclock man page) whereby it will automatically update ...
1
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3answers
267 views
Reboot fails on RHEL 6.1 after kernel update on Amazon EC2
Everytime I start a new RHEL instance, I like to perform a yum update to start with the most up-to-date system. However, everytime I try to reboot the instance after that, the instance never goes ...
3
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3answers
236 views
How to fix “BUG: soft lockup - CPU#0 stuck for 17163091968s”?
UPDATE: I updated the title of the message, because I've recently seen more of these problems with this exact time amount of 17163091968s. This should help people investigating the symptoms to find ...
1
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1answer
91 views
Can't launch Oneiric x64 instance on Eucalyptus
EDIT: after many hours, I've found out that the problem has nothing to do with Eucalyptus. It looks like the image is buggy. Very, very buggy. More details in the end. I didn't manage to fix it, and I ...
0
votes
1answer
191 views
Linux [Hardware Error] message from kernel
Since yesterday I get the following message every few minutes:
Message from syslogd@hostname at Nov 23 12:31:17 ... kernel:[8024326.816370] [Hardware Error]: MC4_STATUS: Corrected error, other ...
1
vote
1answer
133 views
Kernel Panic after Installation Issues with Ubuntu 10.04.3 LTS
Update 2
The installation from Update 1 was successful.
Update 1
Just removed RAID10 from all six drives, and RAID10 configured only the first four devices. After doing so, the installation was ...
3
votes
1answer
54 views
Linux: Visualize writes to a file
I am looking for a way to visualize writes to a big file (2GB) in real-time. The writing process isn't just appending data to the end of the file. Instead, it acts like a container or like a block ...
0
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0answers
38 views
Process hangs in umtxn kernel state on FreeBSD 7.2 system
In order to measure traffic, we wrote a simple multi threaded packet sniffer in C using libpcap. Its results are written to a MySQL database. The application runs on a very simple firewall appliance ...
2
votes
1answer
285 views
Compiling realtime kernel from RHEL 6 MRG sources on CentOS 6
I'm trying to compile kernel-rt-2.6.33.9-rt31.75.el6rt.src.rpm from RHEL6 MRG source RPMs on Centos 6 x86_64 system.
It's first time I'm doing this, so I did research on how to do this properly. From ...
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3answers
296 views
Maximum memory allocation for 32bit linux kernel
I was reading this article that talks about how maximum amount of ram dedicated for kernel usage in 32 bit windows is 2GB even when the total amount of ram is >4GB.
...
0
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1answer
80 views
How to serial-over-lan past “Loading initial ramdisk”?
I'd like to use "ipmitool ... sol activate" to record any kernel panics that may happen. I managed to keep GRUB2 in text-mode with "GRUB_TERMINAL=console" in /etc/default/grub. But right after the ...
0
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1answer
16 views
what is the difference between different kernel namings? [closed]
there are terms like
kernel source
kernel default
kernel header
What is the meaning for which of them and the difference?
1
vote
1answer
73 views
Linux kernel module file size
I'm trying to update the kernel on a CentOS 6 machine with a vanilla 3.1.0-rc10 kernel. It seems to work, except the modules that get created are significantly larger in size than those that come ...
4
votes
2answers
270 views
How can I take advantage of IW10 in kernel 2.6.33?
I've read that 2.6.33+ allows setting custom cwnd.
if the IW is 10 by default (for all distros? only some?)
how does one view what the current IW is on a particular compiled kernel?
references:
...
2
votes
2answers
70 views
upgrading kernel from 2.6.27 to 2.6.32
I have an openvz server, currently running on linux-2.6.27-openvz-kiprensky.1-r1
Now, I'm upgrading server and part of the upgrade is kernel upgrade. Now, I'm offered
...
3
votes
1answer
96 views
Determine if TCP socket is in kernel-space
I have no problem finding out if a socket belongs to user space - I simply scan /proc/ to see which PID owns the [socket]. But with TCP sockets open in the kernel space there is no entry in /proc/ ...
1
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0answers
60 views
Would OOM_Killer succeed if SIGKILL didn't?
Last week an user application turns out to hog one of my servers. It was exhausting the memory gradually and slowly. When I attempted to kill -9 PID the PID went in state D. While this was eating the ...
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4answers
140 views
What's worth changing in kernel configuration? [closed]
I was wondering what do you usually change in the kernel configuration. I am having make menuconfig in front of me right and now I need to prepare the best kernel ever for my new shiny servers. I use ...
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0answers
34 views
Centos Kernel initrd fails
I am using Centos 5.6 , i tried to update kernel version 2.6.30.5,during make install the process get stopped. i tried creating initrd manually but it also fails
/sbin/mkinitrd -v ...
1
vote
1answer
121 views
OpenVZ with RHEL6 kernel & page cache?
After upgrading kernel from debian 2.6.32-openvz-amd64 to RHEL6 2.6.32-042stab035.1, I have problem with kernel page cache.
Looks like no OpenVZ containers use page cache and now I have 10-15GB free ...
0
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3answers
499 views
How do i view / enable kernel logs on centos / red hat linux? [closed]
Possible Duplicate:
How do i view / enable kernel logs on an ec2 instance (amazon linux)?
I've got a centos server that i'm playing around with TCP settings in the sysctl.conf to increase ...
0
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1answer
155 views
How do i view / enable kernel logs on an ec2 instance (amazon linux)?
I've got a amazon ec2 server that i'm playing around with TCP settings in the sysctl.conf to increase the number of concurrent TCP connections it can handle, and i want to be able to view the kernel ...
0
votes
1answer
69 views
ISP uses modified kernel, how do I use the official kernel on CentOS?
I have just rented a dedicated server from OVH which uses a custom kernel, so whenever I run a command like the following:
sudo yum groupinstall 'Development Tools
I get errors due to missing ...
2
votes
3answers
210 views
how do I convert a live root ext3 filesystem to ext4?
I have a root filesystem thats live and mounted and I'd like to convert it to ext4. All the howto's i've read deal with booting off a live CD but thats not an option.
2
votes
2answers
56 views
force files and/or directory into the kernel file cache
Is there any way of forcing or prioritizing a directory, files or files being written/read by a certain process into the kernel file cache?
edit: system is linux.
edit: I have 1 process which writes ...
1
vote
1answer
147 views
ProxMox VPS modprobe fuse not working
I'm needing to mount a directory using sshfs, but for that to work I need fuse.
When I run modprobe fuse i'm getting this:
FATAL: Could not load /lib/modules/2.6.32-4-pve/modules.dep: No such file ...
0
votes
1answer
168 views
Log - Server kernel: INFO: task httpd:000000 blocked for more than 120 seconds
Almost everyday my server is crashing due to hight server load, and even restarting apache or mysql can't solve the problem. I need to reboot the server to solve, or it crash again due to the high ...
1
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2answers
83 views
SYN Flooding kernel message
Hi I'm getting this type of message repeatedly from the kernel:
[1697692.076962] possible SYN flooding on port 80. Sending cookies.
Any idea of what this means? It is on an EC2 host if that makes ...
1
vote
1answer
192 views
Unable to mount fat drive in linux
This is sort of a continuation from How to mount a .bin image file in linux but it morphed into a different problem altogether, so I figured I'd ask a new question with the relevant info rather than ...
