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 These are the errors:

Select allErr jessie/updates/main amd64 Packages
  404  Not Found [IP: 80]
Err jessie/updates/contrib amd64 Packages
  404  Not Found [IP: 80]
Err 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

Select alldeb jessie main non-free contrib
# deb-src jessie  main non-free contrib

deb jessie/updates main contrib non-free
# deb-src jessie/updates main contrib non-free

# wheezy-updates, previously known as 'volatile'
deb jessie-updates main contrib non-free
# deb-src jessie-updates main contrib non-free

# Jessie Backports
deb 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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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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Aug 19, 2015

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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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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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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*
Adaptec AHA-2940UW SCSI adapter
IBM Ultrastar 36GB UW-SCSI HDD
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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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

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Mar 12, 2011

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$ free -m
totalusedfreeshared bufferscached
Mem: 396726851282 0791938


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Jun 27, 2011

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Sep 10, 2011

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Sep 30, 2015

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Aug 5, 2015

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I'm terrified about making the GPU burnt.

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

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Apr 16, 2010

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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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Jan 19, 2010

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Jul 17, 2011

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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 #1 SMP Fri Oct 22 15:34:36 UTC 2010 i686 i686 i386 GNU/Linux
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


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