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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.

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Using reserved / deprecated IPv6 ranges on older linux kernels

I have an old Synology NAS with kernel 2.6.32.12. And I use the Yggdrasil network, which uses the deprecated range 0200::/7 for addressing. About the range 0200::/7: http://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml About…
Evgeny
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Message printing after I apt-get install or needrestart about services, containers, user sessions and VMs

I've just put Ubuntu 22.04 on my server, and when I execute apt-get install x(where x a package I want to download) or needrestart, I get this message that I haven't found an explanation for. Running kernel seems to be up-to-date. No services need…
Costas M
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Debian reboot suggested after kernel update since Bullseye

So I've been using Stretch as a production server for a small academic research office. Had a nice ~500 or so days of uptime, and I kept it up to date as updates rolled. This summer, Stretch was phased out from LTS. So I updated to 10, then 11…
marsisalie
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Kernel version for MySQL 8

I have a server with kernel version 3.10. This seems to be a quite old kernel (though patches are backported). Is there any reason to force an update to kernel 5.x?
Sascha
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Why my server have less maximum number of queues than my processor?

I'm using ubuntu 20.04 LTS with kernel version 5.4.0-117-generic my machine have 12 thread of CPU using Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz. The problem is why my maximum multi-queue configuration is 4 it should be 12 right? following my vCPU…
beruanglaut
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Where is my RAM? Memory leak?

I have a bunch of servers. It's a mix of baremetal, VMs. All running Ubuntu Bionic. This issue has been observed on both types. FYI, I have read similar questions and I've read the answers. I believe this is a unique problem. I am the Infra guy…
Zoro Steve
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System failed, please help me interpret last console messages (screen capture)

This server runs several processes of satellite imagery, it has 256GB of RAM, 12TB disk, 64 CPU cores Intel(R) Xeon(R) Gold 6226R CPU @ 2.90GHz. It should not fail with this charge but it does sometimes. This is a screen capture of a typical…
user2309000
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Should Hard drives always set the rotatinonal flag in /sys/block//queue/rotational?

Folks, AWS exposes HDDs in their D3 instances (https://aws.amazon.com/ec2/instance-types/d3/) as nvme drives and these drives DON'T set the rotational flag as they're supposed to (https://lwn.net/Articles/408428/). I have cut a ticket to AWS, but…
Subu Sankara Subramanian
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Sed issue!! i tried to trigger this command cat test.txt | gf xss | sed ‘s/=.*/=/’ | sed ‘s/URL: //’ | tee testxss.txt

i tried to trigger this command cat test.txt | gf xss | sed ‘s/=.*/=/’ | sed ‘s/URL: //’ | tee testxss.txt but getting error as sed: -e expression #1, char 1: unknown command: ' sed: -e expression #1, char 1: unknown command: ' please help resolve…
Shiv shivay
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atftpd service start and removal error

I am facing error while doing apt --fix-broken install I searched on google but no luck. After this operation, 5,120 B of additional disk space will be used. Do you want to continue? [Y/n] y Preconfiguring packages ... (Reading database ... 487600…
Sanketh MJ
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Openstack ( using libvirt image type as LVM )- Very low IOPS

As part of the base line testing, able to see qcow is providing much higher iops compare to the LVM. Ideally it should be the reverse ( as per my knowledge gathering ) Kindly please advise me on how can i get the better iops while using…
keerthivasan
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traffic shaping with "netem delay" works ok, but limits upload bandwidth to 330KB/s. Why?

I'm using Ubuntu 9.04 and the kernel 2.6 build-in NETEM tool to delay traffic. After I apply: tc qdisc add dev eth0 root netem delay 100ms The upload bandwidth can't go further than 330KB/s and I have a 100Mbit connection. How can I fix this so…
dsmilkov
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Load Testing CPU utilization that occurred while executing at the system level

Is there a way to load test CPU utilization at the kernel level? Output for sar 09:00:01 AM CPU %usr %nice %sys %iowait %steal %irq %soft %guest %gnice %idle 09:01:01 AM all 12.61 9.28 77.46…
taq
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Server has continuous beep alarm when I reload the kernel

Here is the situation: I have a Lenovo ThinkCentre M900 with Linux CentOS 7. I tried to do a kernel load (kexec -l + kexec -e), and it works fine, with one problem. As soon as I enter the kexec -e command, the Server starts a long alarm beep which…
Samuel PE
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CentOS 8 compiling kernel 5.13.7 BTF Error

I'm compiling Kernel 5.13.7 for Centos 8.4.2105 I've got the below error MODPOST vmlinux.symvers MODINFO modules.builtin.modinfo GEN modules.builtin BTF: .tmp_vmlinux.btf: pahole (pahole) is not available Failed to generate BTF for…
Am3Y
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