I found collecting simple trace caused processor busy about 75% on an idle HUS110.
Is it normal or it's dynamic?
as many others "dump", it consumes some resources to collect all the stats/logs/errors/etc...
remember tuf information:
Do not collect the Simple Trace while the PFM data is being collected. Collecting a Simple Trace during PFM data collection will have an adverse effect on the PFM results.
Retrieving data ...