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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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Set number of threads when auto compiling kernel

I use Ubuntu as main operating system. I have found that when a new kernel is included in a system upgrade, during the upgrade, certain kernel-related items are compiled (kernel modules?). During this process, I check that the processor usage is…
Ommadawn
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Is it possible to use DPDK in a server with single NIC?

I have a a server with single NIC which has 4 pci ports. I already tried DPDK binding so before binding "dpdk-devbind.py -s" returns this : Network devices using kernel driver 0000:01:00.0 'OneConnect NIC (Skyhawk) 0720' if=eth0 drv=be2net…
Nafiul Alam Fuji
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Is it possible to disable and re-enable on-board PCI devices in Linux?

So as the title suggests, Is there a way I can disable and re-enable PCI devices or on-board devices on Linux using Terminal like the disable and enable device functions in Windows' Device Manager. I want to do that everytime my PC boots up because…
Insertx2k_Dev
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iotop PRIO column is showing ?sys

How can i fix iotop to show PRIO correct value?
CrazyRabbit
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Unknown kernel command line parameters "BOOT_IMAGE=/vmlinuz-5.18.11-1.el7.elrepo.x86_64", will be passed to user space

On CentOS 7, after upgrading the kernel to version 5.18.11, I observed the below message in /var/log/messages: Unknown kernel command line parameters "BOOT_IMAGE=/vmlinuz-5.18.11-1.el7.elrepo.x86_64", will be passed to user space. What is the root…
Sandeep
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On Linux ZFS Server - What is eating my memory?

Our monitoring tool regularly reports low memory for one of our servers running ZFS. # free -g total used free shared buff/cache available Mem: 125 84 39 0 2 …
Hansjakobli
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Could running gcore increase resident memory (RSS) of the target process on Linux?

gcore attaches gdb to a process, runs through most of the virtual memory areas of a process and dumps them to disk. Does this mean that every piece of anonymous virtual memory will need to be paged into memory within that process and thus increase…
kgibm
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nftables ignoring should-be matches, nftables log shows nonsense frames, tcpdump shows expected frames

EDIT: Solution found. Will post after synthesization and verification. Having come across some head-scratching behavior with nftables, I am hoping for some community insights. When using the below ruleset in a QEMU-KVM guest, Ethernet frames in…
Tanel Rebane
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EDAC reports error on a csrow that does not exist

The kernel log shows many instances of the following EDAC error: EDAC MC0: 1 CE ie31200 CE on unknown memory (csrow:3 channel:1 page:0x0 offset:0x0 grain:1 syndrome:0x1c) The thing is... there is no csrow #3 on my system (output truncated for…
pjwr
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Does iptables rules have control over raw socket packets?

A program I use generates some TCP connections using raw packets mode. Let's say that I executed those two commands: /sbin/iptables -A INPUT -s 8.0.0.0/8 -j DROP /sbin/iptables -A OUTPUT -d 8.0.0.0/8 -j DROP Is it safe to assume that no packets…
d33tah
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Using a compressed initrd when pxe booting

I'm using netboot/pxeboot with grub. menuentry "Install Ubuntu 20.04" { set gfxpayload=keep echo 'Loading vmlinuz ...' linux /tftp/vmlinuz ip=dhcp netboot=nfs nfsroot=10.0.0.20:/data/netboot/nfs/ubuntu2004/ boot=casper toram noquiet…
Rino Bino
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VirtualBox on linux: hangs on __lock_acquire on Fedora Core 35

VirtualBox (VirtualBox-6.1.x86_64) has for sometime been useless on my workstation (Linux FC35,kernel is 5.16.12-200.fc35.x86_64+debug: but the issue existed previously on FC33). The GUI starts, but attempting to activate any VM results in a hang…
Alien Life Form
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Precipitous page allocation failures leading to system crash

We run a platform that uses Linux bridging to filter traffic and also logs that activity to a MySQL server. Occasionally we have an issue where the unit will experience very high latency, and leading up to that we often see a repeating page…
Chuck Horowitz
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Why do I see many "kernel: vif ...: Guest Rx stalled" / "Guest Rx ready" messages?

Since upgrading a Xen host that also is a node in a pacemaker cluster from SLES15 SP2 to SLES15 SP3, I see these messages roughly every 30 seconds, and I wonder: What are these messages telling me? No traffic? What causes these messages? A change…
U. Windl
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DELL R320, Xeon E5-2450 v1, Oracle Linux 8 marks clocksource 'tsc' as unstable, random crashes under load

I recently acquired used Dell R320 with Xeon E5-2450 v1, all firmware's are updated to most recent versions using Lifecycle controller. On boot dmesg reports: microcode: microcode updated early to revision 0x71a, date = 2020-03-24 [ 12.384040]…
valc
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