Thanks Florin

I plan to get a lib onto the load setup today and get a ceiling value ( i just 
picked 64 out of the air ).

Both the samples and sample_lookup where popping out in the flame. In fact i 
went with pre allocating the samples 1st, but the box still wasn't stable. Then 
added in the rb tree backing alloc and this seemed to stabilize it.

I suppose a better approach might have been per worker memory - but then this 
works well with known fixed sizes ( like we can set a max supported sessions or 
something like that ) but doesnt really lend itself to something dynamic as you.

Ill have to have a think on how to provide details on the use case - as its 
basically a load test setup, some trex and some other custom scripts / traffic. 
I have flames but i suppose that's only showing the call path.

Finally - I have took a heap hit with the change above - so ill have to see 
what the ceiling / ave comes back with in the testing. Hopefully its a bit less 
than 64.
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