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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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BPF samples in Fedora

man bpf states that Some complete working code can be found in the samples/bpf directory in the kernel source tree. However I can't find any samples at that location: $ uname -r 5.1.11-200.fc29.x86_64 $ ls…
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What is “ptymonitor” seen in the Linux system logs?

I see "kernel: ptymonitor[8742]: segfault at" in the var logs ... what does "ptymonitor" mean? I don't see any online resources to provide an answer.
user7676946
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Issues booting VM

I am new to Linux, and have inherited a VM that is running centos. It sat idle for about 2 years with no-one touching it. I have run some updates to get the system up-to-date. I think I accidentally did something in my newb attempts and now I cannot…
rxtem01
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Changing Linux kernel network settings on active live TCP sockets

If I change settings like this for example: # sysctl -w net.core.rmem_default=500000 # sysctl -w net.ipv4.tcp_rmem='4000 90000 10000000' Is it safe to do this in a heavy duty live production machine (CentOS 7)? Are there any known risks? Does…
Vladimir Ralev
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High Active(file) Memory Usage in Oracle Linux VMs

I recently searched and read lots of posts and questions about Linux memory management but I can't find my case. For example, there is a question in Unix StackExchange about High memory usage but no process is using it. In this post, the accepted…
Mahdizade
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Unable to access resume device (/dev/VolGroup00/LogVol01) after CentOS custom image import DigitalOcean

I'm trying to import an existing CentOS VM from a VMware environment to run on Digitalocean vis their custom images option. I'm able to successfully run the VMDK in both VMware Workstation and VirtualBox. I've tried using the VMDK itself, and…
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What is tmon and how can I use it?

I found a tmon utility in my CentOS 7.5 and I've googled that: TMON is conceived as a tool to help visualize, tune, and test the complex thermal subsystem. ... For monitoring only: $ sudo…
viktorkho
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cannot boot to the newly compiled kernel version

I have a server with RHEL 7.5 OS. The inbox kernel version on the system is 4.14.0-49. I have a requirement to use the latest available kernel, so I downloaded the Kernel 4.17.18 source package and compiled it on my system. So now I have both the…
Venkata Chalapathy
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Centos 6.8 kernel 2.6.32-642.el6.x86_64 crash at linux-2.6.32-642.el6.x86_64/mm/vmalloc.c: 630

I have intel servers running CentOS 6.8 as KVM host,and there was an OOPS or BUG occurs. kernel crash at kernel-2.6.32-642.el6/linux-2.6.32-642.el6.x86_64/mm/vmalloc.c: 630 Did anyone else have this problem and how to solve it. Here's an exerpt…
windrd
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Linux - memory size

How to check exact amount of memory installed in server? MemTotal from /proc/meminfo show something a bit less. I.e. I have 2097152K and meminfo says 2054348K. I can sum all banks reported by dmidecode but it requires reboot to update - I don't like…
Maciej Wawrzyńczuk
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Improve single HTTP transfer bandwith over high latency connection (Ubuntu Linux)

I'm trying to improve the file transfer speed for my web server in Roubaix, France (hosted by OVH) over high distance/latency connections. I know that TCP connections are affected by higher latency, however I've heard that tuning the TCP stack and…
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Redhat vs Oracle Linux benchmarks

I have two servers, both have Intel 8160 processor, 768 GB memory, same hardware specs, same software/package versions. The only difference being that one is running RedHat Enterprise Linux 7 and the other one is running Oracle Enterprise Linux 7.…
Noisy_Botnet
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I can't connect to my AWS server after yum update on centOS 7

I created a new server (EC2) with centOS 7, and after the first "yum update" and a reboot I can't connect…
Diogo Braga
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VGA monitor blinks with KVM

Tried using several computers with a KVM switch that uses the 25th port on the VGA connection for USB (for the keyboard and mouse - StarTech.com SV1631DUSBUK). Manufacture says the cable they use to connect the PC is proprietary and it allows them…
Dovid Bender
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Cannot explain memory occupancy in linux

I'm working on a debian 9.3, the free command return total used free shared buff/cache available Mem: 131940516 100433176 29189576 33940 2317764 30413920 Swap: 124999676 7736 …
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