I tested the same thing on an xfs fs and the interesting thing was that
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It took me a whole lotta time to delete that stuff. ;-) Maybe under xfs directories just are limited by inodes and nothing else.
COuld u tell me why did u take some much time to delete stuff ??
This is a known performance problem of XFS.
if u know command for and rm and ls u can do it exactly the same what did u do with mkdir command. for i in ls; do rm -rf $i;done thats it. no big deal to remove that files. :)
XFS is slow on large deletes. That is just it.