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I'm trying to measure efficiency of the networking system and looking for a tool that either allows to limit max bandwidth for each test or, ideally, limit cpu utilization. At the end I need to have an answer like "for 10% CPU bandwidth is 10Gbit/s".

Natural choice to test bandwidth alone would be the iperf tool, but it seems to always utilize 100% CPU making it useless for this.

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I am guessing you have multiple CPUs. Then look into cpusets and cpushares. With cpuset you can pin specific process to specific cpu. Then with cpushares you can limit the cpu utilization.

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  • In other hand the idea is to bind iperf to a given core and then measure load on the rest?
    – Kentzo
    Commented Oct 10, 2017 at 19:38
  • yes, that should be ok to do. iperf also has a cpu affinity option.
    – Tux_DEV_NULL
    Commented Oct 11, 2017 at 7:19
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  1. You can consider Apache JMeter tool which can throttle its connections to the defined throughput value which you can set via manipulating the following properties:

    httpclient.socket.http.cps=0
httpclient.socket.https.cps=0

    where cps stands for characters per second

    References:

  2. For limiting CPU usage per process you can use taskset and cpulimit commands combination, check out Restricting process CPU usage using nice, cpulimit, and cgroups article for more details.

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