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Old 17th September 2010, 14:02
enid enid is offline
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Default High load and high cpu kernel usage

Hello to all,

On one Debian GNU/Linux 4.0 server , running different servers like dns/bind, sendmail, apache etc, I'm having high load and with top command there is not anything abnormal, but with htop I can see that kernel cpu usage is getting around 100% for all the cores (showing the bars in red) and also the total load average of the server is getting above 100

The nr of processes and RAM usage seems ok.

Where can I look for any problem related with this?

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Old 18th September 2010, 14:06
falko falko is offline
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I suggest you install munin to find out where the problem comes from (maybe a slow hard drive?): http://www.howtoforge.com/server_mon...it_debian_etch
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Old 18th September 2010, 14:11
edge edge is offline
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An other option is to install htop.
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Old 20th September 2010, 11:46
enid enid is offline
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I think it's a good idea to monitor the server with monin, I'll give it a try.
Also i did suspect that the I/O operations were the cause for the high load,
the hdd's of the server are configured as Raid5.
Yesterday the server went "Kernel Panic" and the only thing to do was a force reboot, also with dmesg I'm getting a lot of these messages:
pop3[21475]: segfault at 0000000000000004 rip 000000000044333a rsp 00007fff7ffe3a10 error 4 (what can they be?)

The htop is already installed

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