Dynamips: compute your idle-pc value

Previously, I talked about dynamips and how to run Cisco hardware virtually. I also talked about an “idle-pc” value that you needed to compute in order to reduce the CPU usage of dynamips.

Let’s try to compute this value:

  1. Start dynamips with your IOS image and an empty configuration.
  2. Wait for the “Press RETURN to get started!” Prompt, and do NOT press enter.
  3. Wait some time (5-10secs) and press “Ctrl-] + i”. Some statistics will be generated during 10 seconds.
  4. You will then see an output such as this one:

  1. Just try to relaunch dynamips with theses values of –idle-pc, If you have found the correct one, and idle router should use between 5 and 15 percent of your CPU..
  2. Keep this value preciously 😉

That’s it

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