Questions tagged [linux-kernel]
This tag is for questions about the internals of the Linux kernel itself - particularly about use or configuration of kernel modules or drivers.
492
questions
1
vote
0
answers
495
views
net.core.netdev_max_backlog - what's the impact when set too HIGH?
I'm working on optimizing and right-sizing my EC2 syslog-ng servers and have some carryover settings in our ansible playbook for kernel settings that were used on "in-house" data center ...
- 11
0
votes
0
answers
208
views
How can I install Kernel 5.17 on CentOS 7?
On a CentOS 7.9 installation I have some troubles running newer CPUs, e.g Ryzen 5 5600G (with included graphics).
I concluded that it is the Kernel because it boots with certain versions, with kernel ...
- 272
2
votes
1
answer
445
views
Is there anything preventing modifying linux's tcp stack to have over 65,535 ports?
I was reading this and started to wonder of there was anything preventing me from just modifying a copy of the linux tcp stack to support more than a 16-bit header to allow for more ports. Would this ...
- 23
5
votes
1
answer
8k
views
High System CPU usage on Linux
We have an unusual problem where some of our Linux servers are going into a state where the CPU utilisation is very high and when we dig down, most of it is in kernel space. The %sys utilisation is 80%...
- 161
0
votes
1
answer
3k
views
Change default kernel for an AWS instance running Ubuntu 18.04
1. Problem summary
I have an instance on AWS running Ubuntu 18.04. The kernel version is 5.4.0. I have installed kernel 4.15.0 but I am failing to set it as the default.
2. What I have tried
A) I set ...
- 1
0
votes
1
answer
146
views
Can't open pseudoterminals from local following an update on Arch
I did a complete update (via yay->pacman), restarted, and now I seemingly can't open any pseudoterminals. All I can do is switch to TTY/teletype terminals. If I try to open a terminal app, it just ...
- 351
1
vote
0
answers
721
views
Fedora 35: Switch back to stock kernel?
A few months ago I built a new machine and installed Fedora on it. At the time, 5.15 was the latest "stock" kernel, but I needed some of the Alder Lake fixes/improvements from 5.16 and 5.17,...
- 11
1
vote
1
answer
154
views
linux-ck-ivybridge stuck on 5.12.18-1
I use the CPU optimized kernel linux-ck-ivybridge on Arch Linux using the repository below, however for unknown reasons pacman has stopped upgrading the kernel since July 2021.
It is also not listed ...
- 491
1
vote
0
answers
2k
views
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000005
I'm pretty new to embedded linux and I would really appreciate a bit of help. I'm trying to run a linux kernel on the risc-v fpga.
I built linux 5.0.0 with busybox initramfs and compiled with this ...
- 11
1
vote
1
answer
3k
views
UEFI Variable Storage (removing /sys/firmware/efi dump files) when Kernel Variables CONFIG_EFIVAR_FS & CONFIG_EFI_VARS both =y as in Ubuntu 20.04
In the Arch Wiki I see that the two kernel variables CONFIG_EFIVAR_FS & CONFIG_EFI_VARS should be set =y and =n respectively. Arch says, "This option should be disabled to prevent any ...
- 724
0
votes
1
answer
101
views
KVM 3.1.1 installation
I have a requirement to install KVM 3.1.1 on RHEL7 or 8.
When I am checking I found that qemu-kvm is automatically installed on RHEL8 and the version is 4.2.
It would be great if anyone can share the ...
- 23
0
votes
0
answers
133
views
Linux System goes back to vendor's default config after reboot
I hope everyone is 0k.
I have embraced Linux systems for around 3-4 years now, I am not what you called an expert nor a rookie.
Anyway, I have a NAS device running BusyBox v1.20.2 - Linux version 3.2....
2
votes
1
answer
4k
views
How to use dracut in chroot environment established through SLES15 Rescue boot image?
To fix an unbootable SLES15 system, I booted the Rescue image, mounted the existing system to /mnt, and then did chroot /mnt (I'm leaving out the details, as those are probably known (or found in How ...
- 705
2
votes
1
answer
992
views
HDD I/O error after high multithreading usage
I have a computer with 64 physical cores (AMD Ryzen Threadripper PRO 3995WX 64-Cores), with two threads per core capability (that is, 128 logical cores), running on Ubuntu 20.04.3 LTS. Recently, I ...
- 23
3
votes
0
answers
2k
views
Connecting two monitors at boot causes Linux kernel to hang when enabling KMS
When two monitors are connected at boot, the Linux kernel completely hangs at fb0: switching to i915 from EFI VGA. The screens stay on and continue displaying the last message, but everything is ...
- 116