There was some discussion about this last week. It appears to
be due to ext2's directory placement policy. Al Viro has a
patch which implements the "Orlov allocator" which FreeBSD are
using.
It works, and it'll get you close to disk bandwidth with this test.
But the effects of this change on other workloads (the so-called
"slow growth" scenario) still needs to be understood and tested.
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