> From: Garrett D'Amore [mailto:garr...@nexenta.com]
> 
> It is tunable, I don't remember the exact tunable name...
Arc_metadata_limit
> or some such.

There it is:
echo "::arc" | sudo mdb -k | grep meta_limit
arc_meta_limit            =       286 MB

Looking at my chart earlier in this discussion, it seems like this might not
be the cause of the problem.  In my absolute largest test that I ran, my
supposed (calculated) DDT size was 287MB, so this performance abyss was
definitely happening at sizes smaller than the arc_meta_limit.

But I'll go tune and test with this knowledge, just to be sure.

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