High load and high cpu kernel usage

[enid]

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?

Thanks,
Enid