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When I did a 'top' command on my SUSE 11 sp1 system, I noticed that command telnet is 88% CPU. Sometime I saw 99% cpu. My understanding is this is ...
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  1. #1
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    When I did a 'top' command on my SUSE 11 sp1 system, I noticed that command telnet is 88% CPU. Sometime I saw 99% cpu. My understanding is this is what is used at the point in time when top is getting the data. But should I be concern about this?

    I also see
    Cpu(s): 35.0%us, 64.9%sy, my understanding of this is kernel is using 64.9% of CPU and User is using 35%. This adds up to be 99.9%. Does it mean CPU usage is 99.9% at that point in time ?

    me@server0001:~> top
    top - 16:12:57 up 11 days, 11:06, 6 users, load average: 7.37, 7.47, 7.51
    Tasks: 232 total, 8 running, 204 sleeping, 0 stopped, 20 zombie
    Cpu(s): 35.0%us, 64.9%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.1%si, 0.0%st
    Mem: 8064932k total, 7878900k used, 186032k free, 154292k buffers
    Swap: 8388600k total, 75776k used, 8312824k free, 1664272k cached

    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
    2153 root 20 0 8592 712 544 R 88 0.0 1482:51 telnet
    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
    2153 root 20 0 8592 712 544 R 88 0.0 1482:51 telnet

  2. #2
    Linux Engineer docbop's Avatar
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    High numbers are no big deal in short spurts, what you don't want is 95%+ sustained for long periods.
    A lion does not lose sleep, over the opinion of sheep.

  3. #3
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    IMO these days the fact that "telnet" is running at all is odd. That it's consumed a significant amount of CPU and is running as "root" is unusual as well. Any idea why there are "telnet" clients running on the system?

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