David G Lawrence wrote:
Try it with "find / -type f >/dev/null" to duplicate the problem almost
instantly.

   FreeBSD used to have some code that would cause vnodes with no cached
pages to be recycled quickly (which would have made a simple find
ineffective without reading the files at least a little bit). I guess
that got removed when the size of the vnode pool was dramatically
increased.
You can decrease vfs.wantfreevnodes if caching files without cached data is not beneficial
for your application.

-DG

David G. Lawrence
President
Download Technologies, Inc. - http://www.downloadtech.com - (866) 399 8500
The FreeBSD Project - http://www.freebsd.org
Pave the road of life with opportunities.
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