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Cisco ASA 5510 Enabling Top Usage Status Resource Utilization?

Does anyone have experience with what kind of effect enabling Top Usage Status has on system resources on a Cisco ASA 5510 with 256 MB of RAM and CPU?

Currently we are using low amounts of CPU, below 20%.  But we are using about 141MB of RAM.

It seems like an interesting feature to use, I am hoping that it will allow me to check basic usage statistics for bandwidth hogs and then I can walk over and yell at them.

I found this Cisco forum post, it's short with only one response.  The responder seems to indicate that it uses quite a bit of RAM resources...
https://supportforums.cisco.com/thread/2089141

Has anyone actually enabled this on an ASA 5510 with 256 MB of RAM?  Did they have any issues?  Did it cause the ASA to freeze or lockup in anyway?

Also, I am guessing that like with all things Cisco, such a change would not automatically be committed to flash memory unless I instructed it to save running config to flash, so that in worst case scenario, I can simply restart the ASA and it would revert back to start-up configuration before I had enabled the feature?

Thanks
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Istvan Kalmar
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