Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [linux-kernel]

The Linux kernel is the operating system kernel used by the Linux family of Unix-like operating systems. It is one of the most prominent examples of free and open source software.

The Linux kernel is the operating system kernel used by the Linux family of Unix-like operating systems. It is one of the most prominent examples of free and open source software.

The Linux kernel is released under the GNU General Public License version 2 (GPLv2) (plus some firmware images with various non-free licenses[citation needed]), and is developed by contributors worldwide. Day-to-day development discussions take place on the Linux kernel mailing list.

585 questions
3
votes
0 answers

How to setup nvmetcli for FC loopback mode?

I have a NVMe SSD, KC1000, from Kingston and a HBA, QLE2672 2-port 16Gb Fibre Channel Adapter, from QLogic and are installed on Linux kernel 4.16.6. Then I would like to set up a scenario which has a fc loop mode which is to use the sole FC HBA as…
codexplorer
  • 181
  • 5
3
votes
2 answers

Network interface periodically going down with speed changed to 0 kernel errors

Over the last couple of days, the bonded network interface on one of our servers has stopped responding. Looking through the kernel logs, I notice when the interface goes down, we are getting lots of repeated errors of the form: [76019.645601]…
PicoutputCls
  • 253
  • 4
  • 15
3
votes
1 answer

Why the buff/cache showed in free command is more than which listed in vmstat and meminfo？

$ free total used free shared buff/cache available Mem: 16349804 4727520 9075260 13992 2547024 11238920 Swap: 19528700 12284 19516416 $ cat /proc/vmstat nr_free_pages…
Bbs Faqs
  • 31
  • 1
  • 2
3
votes
2 answers

Faster alternative to echo 3 > /proc/sys/vm/drop_caches

On a system with huge memory available: 12TB of RAM echo 3 > /proc/sys/vm/drop_caches takes like half an hour to complete. Does anyone know a faster alternative to drop_caches? I'm using RHEL 6.5 on this server. Do you know if more recent RHEL…
user380763
3
votes
0 answers

How to get x86_energy_perf_policy // linux-tools-* for Linux kernel 4.7.0-xyz

I am using pstate-frequency to set our server cpu's frequency. This tool needs the x86_energy_perf_policy which is provided by the linux-tools-common package. Using the distributions standard kernel I could simply install…
Flatron
  • 318
  • 2
  • 5
  • 19
3
votes
3 answers

Change kernel of Centos OVH

I'm using a server of OVH with OS centos7. OVH has its own linux kernel: 3.14.32-xxxx-grs-ipv6-64 Now I try to configure another Centos7 kernel. I installed the other kernel(s). yum install kernel ls /boot shows…
DenCowboy
  • 313
  • 3
  • 6
  • 15
3
votes
1 answer

Can I extract a private key out of Tomcat's memory?

I'm running Tomcat 6. I was messing around with my keystore in order to try to fix some certificate chain problems, and I accidentally rm'd the production version instead of the .new file I was working with. Now, Tomcat is still running and still…
strugee
  • 891
  • 11
  • 25
3
votes
1 answer

How to use pNFS in NFSv4.1

As I know, pNFS is an extended protocol over NFSv4.1. So, I have two questions: How to use pNFS in NFSv4.1? Is there any special requirement for kernel version in server side?
Waveter
  • 564
  • 2
  • 6
  • 23
3
votes
0 answers

Kernel Crash - kernel: BUG: unable to handle kernel paging request at 00000000ff8179b9

One of my Oracle Linux 6.5 Server running Oracle ASM/GRID experienced a kernel crash, it didn't respond i have performed a hard reboot. Server is Oracle Linux 6.5, kernel 2.6.39-400.214.3.el6uek.x86_64, 32GB RAM, 35GB swap, also there is no warning…
J. B. Hat
  • 31
  • 2
3
votes
1 answer

Oracle invoked oom-killer even when RAM and SWAP is plenty free?

Can you please tell me what cause this Oracle process killed? Seems like plenty of RAM free, and plenty of SWAP free. There followed few other oracle processes killed. The VM has the 16G of vMem and 8 vCPU. But I am posting here the first oracle…
RADONE
  • 33
  • 1
  • 4
3
votes
1 answer

Unmount a rbind mount without affecting the original mount

There is another question discussing about umounting rbind mounts, but the solution has unwanted effect. Consider the following directory layout: . ├── A_dir │ └── mount_b ├── B_dir │ └── mount_c └── C_dir Now I bind C_dir to B_dir/mount_c and…
icando
  • 229
  • 2
  • 8
3
votes
1 answer

Linux route unexpected mtu

i'm observing rather strange (at least for me) behaviour for few routes in my network. i use gre interfaces on top of ipsec tunnels. these gre interfaces have mtu 1400 on my entire network. normally i see this kind of tracepath output: 1?:…
RMielnik
  • 31
  • 1
3
votes
0 answers

TCP buffer sizes and ethernet bonding

(This question was originally posted on stack overflow; Andy told me that I could get faster help here, so it is re-posted here now.) I am experimenting with TCP buffer size tuning on Linux, but various results make me confused. The test programs…
user2595776
  • 131
  • 1
3
votes
0 answers

Auto-Reboot on Kernel BUG (not tainted, “fixing recursive fault but reboot is needed”)

I'm running a sometimes highly loaded Debian 7 VM with the latest 3.2.x kernel on a XenServer 6.2 host. Sometimes this VM runs into the following state: Ping is okay, All Services unreachable (including SSH) A message showing a trace + "kernel BUG"…
Julian Kessel
  • 151
  • 7
3
votes
1 answer

Linux OOM-killer disabling woes

I have a Linux machine with no swap, which has vm.overcommit_memory=2 and vm.overcommit_ratio=100 set. However these settings seem to have no effect. Some newly-started processes which attempt to consume a lot of memory are still being OOM-killed…
jotik
  • 159
  • 6
1 2 3
…
38 39