Debian Configuration :: Sid Kswapd0 High CPU Consistently

Mar 23, 2016

My sid running fine for months until recently. It is now freezed more frequently. Brief looking at process I found kswapd0 constantly consume 50% cpu right after booting in, even when swap usage is only 3%.

Code: Select all$top
top - 12:00:30 up 47 min,  2 users,  load average: 2.11, 2.36, 2.40
Tasks: 155 total,   3 running, 152 sleeping,   0 stopped,   0 zombie
%Cpu(s): 17.0 us, 59.1 sy,  1.2 ni, 20.4 id,  2.3 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :  1868396 total,   695024 free,   656048 used,   517324 buff/cache
KiB Swap:  4095992 total,  3972288 free,   123704 used.  1096476 avail Mem

[Code] ....

My current release is

Code: Select all$ uname -a
Linux GlobeTravelers 4.4.0-1-amd64 #1 SMP Debian 4.4.6-1 (2016-03-17) x86_64 GNU/Linux
$lsb_release -a
No LSB modules are available.
Distributor ID:   Debian
Description:   Debian GNU/Linux testing-updates (sid)
Release:   testing-updates
Codename:   sid

disable swap is not my priority...

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Debian Configuration :: Consistently Getting Errors With Apt-get Update

Oct 22, 2015

I have Jessie in a VM. For some days I have been consistently getting errors with apt-get update, no matter if I use httpredir of ftp.us. These are the errors:

Code:
Select allErr http://ftp.us.debian.org jessie/updates/main amd64 Packages
  404  Not Found [IP: 64.50.236.52 80]
Err http://ftp.us.debian.org jessie/updates/contrib amd64 Packages
  404  Not Found [IP: 64.50.236.52 80]
Err http://ftp.us.debian.org jessie/updates/non-free amd64 Packages

[Code] ....

E: Some index files failed to download. They have been ignored, or old ones used instead.

And this is the syntax in my /etc/apt/sources.list

Code:
Select alldeb http://ftp.us.debian.org/debian/ jessie main non-free contrib
# deb-src http://ftp.us.debian.org/debian/ jessie  main non-free contrib

deb http://ftp.us.debian.org/ jessie/updates main contrib non-free
# deb-src http://ftp.us.debian.org/ jessie/updates main contrib non-free

# wheezy-updates, previously known as 'volatile'
deb http://ftp.us.debian.org/debian/ jessie-updates main contrib non-free
# deb-src http://ftp.us.debian.org/debian/ jessie-updates main contrib non-free

# Jessie Backports
deb http://http.debian.net/debian jessie-backports main contrib non-free

Mirrors cannot be down for so long, so what is going on?

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Debian Configuration :: Java Uses High CPU In Jessie

Jun 24, 2015

I have a relative fresh install of jessie in which I face a high cpu usage of java (top shows about 165% CPU and 12% MEM). The problem occurs right after booting the computer. These values stay constantly high for days if I leave the box running. This happens even if the computer is just sitting there without doing anything.

I have to kill java to go back to normal. So, when I do a
Code: Select allkillall -KILL java
the problem goes away. After that it doesn't reappear and I can use all apps installed without a problem.

Currently I am based on openjdk
Code: Select allupdate-alternatives --display java
java - auto mode
  link currently points to /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java - priority 1071
  slave java.1.gz: /usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/java.1.gz
Current 'best' version is '/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java'.

But I have also tried the SUN version with the same result.

Where to look to find more information on what exactly java app is using so much resources and how I can solve it? I guess I could just put somewhere in rc.d a kill java command and forget about it but I would really like to find out whats going on...

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Debian Configuration :: High CPU Temp Wheezy X200

May 10, 2015

I am noticing some rather high CPU temps while using Debian 7.8 KDE on a Lenovo X200 laptop.

Even when its not doing anything its getting as high as 70C sometimes. I opened it up and went in with a can of compressed air, it went down a little to 36C now its back to 70c the day after.

Then I realised the fan was hardly spinning is there any way I can control how much (or little) the fan spins at certain temps?

My guesses are it could be done with a bash / shell script in the kernal loaded at booting up. But am unsure.

Here is my dmesg [URL] ....

And lsmod [URL] ....

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Debian Configuration :: Fault Tolerance / High Availability

Aug 19, 2015

I work for a data center where we use a whole lot of VMware's "Fault Tolerant" Solution. As a personal project, I want to piece together an alternative solution out of open source software.

Here's my punchlist:

*Configure Debian (or build from scratch) to be as slimmed down as possible so that I may call it "Just Enough OS" or "baremetal"
*Install and configure Xen with XenMotion
*Prove that both the physical and virtual fail-overs work as intended
*Prove the automatic repair of failed virtual machines.

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Jan 20, 2011

I have three 10Gb Fibre PCI ethernet cards and 2 onboard gigabit ports. The two gigabit ports always seem to be mapped to eth0 and eth1. I set the network configuration for eth2, eth3, and eth4 in the /etc/sysconfig/network-scripts/ifcfg-eth# files. Would the NIC in PCI slot 1 always be mapped to eth2, NIC in slot 2 mapped to eth3, and NIC in slot 3 always mapped to eth4?

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Debian :: Hibernate Is Not Consistently Resuming

Jun 29, 2015

Although it's worked very consistently in the past, since moving to the newer kernels (3.16 or 4.0) on strech/sid, resuming from hibernation seems to randomly work -- sometimes it loads the image from swap, but other times it simply does a fresh boot. To troubleshoot, I've increase the size of swap and then updated 'fstab', the initramdisk, and grub -- but still no reliable behavior...

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Debian Installation :: Disk Partitioning Consistently Triggers Computer Restart

Jan 3, 2016

I'm trying to perform a clean installation of 8.0.0-i386 from a CD. Seven consecutive attempts all result in the same issue: Almost immediately after commiting the disk partitioning settings (i.e., to begin formatting), the computer does a hard restart. I have tried doing the partitioning as early as possible in the installation process, just in case the system is running out of memory; I have also tried using the lowmem option. I suspect the problem may be related to my very old hardware...

Micronics serverboard 440BX chipset*
Dual Pentium II 450MHz CPUs*
1GB ECC RAM*
Adaptec AHA-2940UW SCSI adapter
IBM Ultrastar 36GB UW-SCSI HDD
ATAPI CD-ROM
Matrox G100 AGP video card*
*starred items are all original parts from an Intergraph server with validation/verification stickers attesting to their intercompatibility

No POST errors, the HDD passed verification using the Adaptec ROM utility, all unnecessary hardware removed

Could it be that I need an older release or some custom-compiled kernel? The only thing I could come up with on the web was that a lot of people have a similar failure with modern distros on non-PAE CPUs, but the P-II should not be susceptible to this problem.

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May 17, 2011

I am using Ubuntu11.11 on my Samsung netbook. Since my installation, I am meeting a problem from time to time that the process kswapd0 leads to high data exchange of my solid-state hard-disk, and freezes the entire system which forces me to restart my computer. This problem occurs even though kswapd0 occupies only 28% CPU resource.

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OpenSUSE :: Kswapd0 Interupts Media Players?

Apr 4, 2010

I use suse 11.2 86_64 on a comp with Nvidia Geforce 8300 on the motherboard using 512 Mb from main memory, AMD X2 Dual Core 4600+ RAM 8 GB DDR2 Dual channel and have following problem - from time to time when play a video (streaming or playing a file with any video player - vlc, smplayer, kaffeine etc.) the sound suddenly disappears short afterwards everything freezes even mouse, the hard disk work as wild and after 5 minutes or so the players quit and everything comes alive again. Long time I could not see the process responsible for that because even screen freezes, once I had the luck and noticed a process kswapd0 appearing in time of such an event. I googled and there were similar complying connected with that daemon. I read it will be a good idea to minimize the amount of swap, which in my case is 2 Gb , I unmounted the entire swap and restarted and the OS remains only on RAM 7,5 GB . The event appeared again and there were significant different, it obviously was shorter in time (about a minute) and mouse freezes for short period of time, but again the player quits on the end of the event. Is there a way that the process could be managed in some way as it is very annoying appearing all of a sudden with no warning or something ? Of course if that memory shifting or cleaning is the main problem, again it happens only in case player works and not every time, it is random.

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Oct 20, 2010

Our CentOS 5.5 server has an intermittent problem where kswapd0 begins using 100% CPU, driving the system load to 20-30 and higher, and eventually crashes the server. The problem seems to be triggered by an intensive Java process (Lucene indexing), but only once every month or two. Lucene reindexing normally runs every 15 minutes without a problem. When the problem happens, there is still plenty of free RAM (as measured by /usr/bin/free's "buffers/cache" value, which is 1.5GB) and free swap space. The server is running MediaWiki 1.15 with the standard CentOS Apache, PHP, MySQL. My intuition is that this is a kernel/swapper bug.

Kernel info:
$ uname -a
Linux myhost 2.6.18-194.11.1.el5 #1 SMP Tue Aug 10 19:05:06 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

Memory info:
Normal memory usage:
$ free
total used free shared buffers cached
Mem: 3090688 2769932 320756 0 258416 1531780
-/+ buffers/cache: 979736 2110952
Swap: 2097144 8212 2088932

Memory usage 30 seconds before a crash:
$ free
total used free shared buffers cached
Mem: 3090688 3050764 39924 0 113772 1309972
-/+ buffers/cache: 1627020 1463668
Swap: 2097144 179480 1917664

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Sep 15, 2015

I have a debian system with the following version you can se bellow. My problem is that one one single core of 4 it's running 100% all the time and i cant seem to find out why. The load is also high(load average: 0.91, 0.75, 0.40) because of this. This keeps happening even after reboots. The system if freshly installed twice and the same problem occours as soon as it boots. Something called kworker is running and causing the load / CPU load, is that normal for a fresh install??

root@Cyberdyne:/# lsb_release -da
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 8.2 (jessie)
Release: 8.2
Codename: jessie

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Feb 8, 2011

my server normally has low load of 0.80 now it is 4.0 'top' shows that programs are not using high cpu, but %wa is very high (80-90%). it has been like this for hours now.how can i find out which program has caused this?

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Mar 12, 2011

I've installed my debian sid about one month ago (first xfce, next gnome) but noticed that it's kind of really slow. The upgrades take ages, launching (and using) firefox takes so much time,... In comparaison to my ubuntu, archlinux (on the same computer) or previous installation of debian there is clearly a problem somewhere.Today I tried to do a "top" sorted by mem usage : 3.5% xulrunner-stub, 2.1% dropbox, 1.4% aptitude (doing upgrade), 1.4% clementine,... nothing terriblebut still I've 2.7Gb or RAM used (more than 50%)

$ free -m
totalusedfreeshared bufferscached
Mem: 396726851282 0791938

[code]....

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Jun 27, 2011

I try to open an application, and it's painfully slow, and i think "this is weird i've had it open just 10 seconds ago and it should be in the cache". the disk is constantly working, so maybe i ran out of ram and it's swapping, so i check: according to 'free -m', about 200m of 2g ram is used (without buffers/cache), but still also 200m of swap is used, although swappiness is set to 1 (low tendency to swap). so this is not normal.also, kswapd0 is eating pretty much cpu (but not 100%). switching to tty1, logging in, and starting iotop takes about a minute. according to iotop, about 8 random processes (could be a browser, could be some daemon) have 99% IO activity (i'm not sure what that means, how can 8 processes take 99% each?).after the first 3 times, i disabled swap by adding swapoff -a to rc.local, but it's still the same, and kswapd is still among the cpu-eaters.

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Sep 10, 2011

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I'm not a "computer hobbyist," far from it. I use my machine mainly for browsing, word processing, and business (QuickBooks and Turbo Tax). It is a tool. I don't really enjoy fiddling around with computers. My current machine is now barely able to support a good research session on the 'Net anymore, the little processor seemingly gagging on the heavy flash content you see everywhere nowadays, the 2GB (the most she'll take) of RAM easily filled.

I'm planning some rough travel international motorcycle trips (see my motorcycle build thread here (don't worry about registering on this motorcycle forum.....they are good folks and I've never gotten any spam from them) and purchased, a while back, an Asus eee PC 901 with the OEM Xandros (a bastardized offshoot of Etch) loaded to use with those trips. From learning that OS, I saw for myself the benefits of Linux (vs. Windows). Of all the distros, Debian is the most attractive to me (even though I'm currently rocking Puppeee (new version) on the 901.....it makes that little machine zoooooom!) as I really like the package management system, the logic, and the stability. I also like the feeling of personal responsibility that comes with Debian.

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Sep 30, 2015

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Aug 5, 2015

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Aug 15, 2015

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I'm terrified about making the GPU burnt.

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Feb 23, 2010

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If you need any more information about my setup, let me know.

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Apr 16, 2010

After 6 months or so I noticed my 9.10 install getting sluggish and it started to freeze habitually. I let it go until one day it consistently froze at the startup login screen. I installed 10.04 and the problem continued - After first installing it worked for about 6 hours without a crash, and then once again the problem developed into consistently freezing at the login screen.

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I think it's maybe a software issue with the nvidia drivers. I'm having trouble diagnosing this bug or providing information. I've included the output of lspci -vvv I have the nVidia GeForce Go 6100 graphics card

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May 16, 2010

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Jun 10, 2010

I can't seem to get apt-get or the update manager to work consistently since I upgraded to 10.04. First, I get a regular segmentation fault on about a daily basis, I run sudo rm /var/cache/apt/*.bin as I saw in other threads, and then it usually works.

However now anytime I try to update, upgrade or install, I get the following error:

Reading package lists... Error!
E: Problem parsing dependency Depends
E: Error occurred while processing git-cola (NewVersion1)
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E: The package lists or status file could not be parsed or opened.

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Jan 19, 2010

Why does Ubuntu still have such a hard time hibernating? I've been running it since 7.04 and never have I had a system that consistently hibernates correctly. With 9.10 it starts to, does the big CPU use to store stuff, then all the sudden it just turns back on....

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Jun 9, 2015

I've a high resolution monitor(2560x1440) on my laptop running Debian testing and would like to change the font size in X. I manage to change most of the fonts to a readable size through the openbox configuration manager. But the font in my login window and for example in apps like vlc is still very tiny. How this could be changed ....

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Jun 10, 2011

On my lenovo g560 i have Intel core i3-330m, i have both debian squeeze and windows 7 installed on my laptop.Today i noticed that while playing music (amarok) and playing a flash game (google chrome, game - tetris, lol (: ) the processor core temperature was around 70-71deg celsius.I restarted and booted windows 7, doing the same thing (music and tetris) the processor temperature is aournd 54-55deg celsius.Can anyone explain why the high temperature when running debian?

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Jul 17, 2011

I'm having trouble getting my microphone to work. Here is my sound card:

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00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio (rev a2)

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Dec 6, 2010

I want to use 1920x1080 in the virtual consoles, with:

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Switching back to the open source drivers, it works automatically, but I got no clue with these ones. Someone say I should use uvesafb by modifing initramfs accordingly.

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Dec 7, 2010

I recently upgraded from Fedora 11 to Fedora 14 on my Dell Latitude E6400 notebook PC. It's a Dual core processor, as seen in the uname provided below:

uname -a:
Linux COMPUTERNAME 2.6.35.6-48.fc14.i686 #1 SMP Fri Oct 22 15:34:36 UTC 2010 i686 i686 i386 GNU/Linux
redhat-release:
Fedora release 14 (Laughlin)

Since the upgrade, I've noticed some unexplainable behavior: The load average is consistently 0.5 - 1.75 when my PC is completely idle (99% according to top). No processes are in the D (I/O) state, and I have no Zombie processes. This happens on a fresh boot, every time. It gets worse and less worse, and bounces from unusable (cursor stops moving as I type in the terminal, to actually losing keystrokes at times). I'm wondering if anybody else is experiencing similar issues, or knows of a (the) kernel bug which is causing this behavior? Actively researching the issue. I've come across the following: Tens of wakes per second in "[kernel scheduler] Load balancing tick" on Core 2 Duo even with only 1 core enabled

[Code]....

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Jan 6, 2010

I have a mail server running ubuntu 9.04 w/ the default setup (for the most part): Postfix + Dovecot + SSL. I generally use Ubuntu 9.10 as the client machine running evolution. I have a myriad of subfolders to the inbox on the server that I created in Evolution. Occassionally I do connect using another machine and use IMAP. In one instance I use the Windows 7 I have on the same machine (dual boot) and access the server. Most of the server's sub-folders are not visible but many are.

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