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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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What are the advantages NAPI before the IRQ Coalesce?

As known there are two approach to avoid some overheads of hardware interrupts in highload networks, when there are too many hardware interrupts, that switching to them takes too much time. It is very important for performance and choosing approach…
Alex
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Unidentifiable processes under Redhat Linux

Upon issuing a ps ax command on a server I see the following processes that I can't identify. Googling them yields nothing useful. Does anybody know what these are or how I would track them down? The system is a virtual machine running on VMware.…
thatguy
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order 4 allocation failure disaster

Some environment details first: Hardware: Intel Server Board S2600GZ 2 x Intel Xeon CPU E5-2620 64GB DDR3 RAM Intel RAID Controller RS2BL (LSI SAS2108) with 4TB LVM Volume made of SAS disks Software: Ubuntu 12.04.4 LTS / Linux 3.11.0-24-generic…
Jacob Becker
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Linux kernel thread dependency graph?

I'm trying to benchmark a system with a software RAID-10 volume, backed by Fusion IO cards. Is it possible to display a Linux kernel thread dependency graph? I would like to know how all the [xfs], [md], [md0_raid10], and [fct-smp] threads…
skohrs
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What is the purpose of /proc/config.gz

Please what is the purpose of the /proc/config.gz file in my Linux server filesystem? Is it some backup file, or it is an updated file by the Linux system? Can I change it?
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Linux high load with ImageMagick convert utility and server freezes (blktrack output attached)

I'm using ImageMagick to convert a JPG to TIF file, and I'm using the limit options for Imagemagick as below: /usr/bin/convert -limit memory 256 -limit map 512 subjectfile.jpg -colorspace Gray -depth 8 -resample 200x200 output.tif When I run the…
Imran Imtiaz
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Debian on Hyper-V

I installed Debian with kernel 2.6.32-5-686 on a Hyper-V virtual machine. I had to add a legacy network card. I follow this tutorial http://www.yusufozturk.info/linux-server/debian-2-6-36-kernel-upgrade-for-hyper-v-client-drivers.html to add Hyper-V…
Tobia
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How can I tell the kernel to free cached memory during memory allocation request instead of the OOM killer terminating the application

I am running Ubuntu 10.04 with the below kernel version Linux ip-10-0-1-119 2.6.32-343-ec2 #45-Ubuntu SMP Tue Feb 14 18:18:17 UTC 2012 x86_64 GNU/Linux The memory status shows that the cache is using the maximum share of the…
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What is the interrest of playing with drop_caches?

I've seen sysadmins playing with /proc/sys/vm/drop_caches (echo 3 into this file from a cron) in order to free caches. Is there a real interrest in doing this? Aren't the clean caches reclaimed when needed? Thanks.
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how do i set hard and soft file limits for a non-root user at boot?

I have a xen HVM vps and I'm trying to raise the hard and soft file limits for nobody at boot time. I'm using Ubuntu 10.04.3 and inside /etc/security/limits.conf I have: nobody soft nofile 10000 nobody hard nofile 30000 But…
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Installed 2TB disk in ubuntu server, dmesg reports it as 9444732965540666 MB

I've have an ageing Linux server running on Dell PowerEdge hardware, with a SAS 5IR RAID controller. It has a pair of SAS 146Gb disks in a RAID 1 configuration that has the OS and other software. I have a need to add a large chunk of storage to the…
Bryan
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netconsole or serial logging in XenServer DomU

I have some problems with stability of Debian guests in my XenServer hosts. To debug this problem I wanted to use netconsole kernel module, unfortunately, because the Ethernet controller is emulated, it doesn't support polling and in effect…
Hubert Kario
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Can't find the pdflush thread?

I just found out there's no pdflush on my Linux, v2.6.38. But when I do a ps uax | grep flush It shows: root 269 0.1 0.0 0 0 ? S 13:05 0:04 [flush-8:0] My kernel is: Linux yonggang-laptop 2.6.38-11-generic #50-Ubuntu…
yonggang
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Linux kernel crash - any ideas?

Been getting these runaway conditions on a lightly loaded vps (debian squeeze kernel 2.6.38-bpo.2-amd64, 2GB, SSD) - top load is nothing , then jumps to 30.0 & everything grinds to a halt. I'm guessing the Xen Hypervisor kicks in and limits things…
jimg
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Very low performance of raid6

I noticed that writing to raid-6 is very low, but when I make tests with hdparm the speed is reasonable: dd if=/dev/zero of=/store/01/test.tmp bs=1M count=10000 Gives: 50Mb/s or even less. The hdparm gives: hdparm --direct -t…
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