From owner-freebsd-performance@FreeBSD.ORG  Wed May  6 15:02:34 2009
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From: Olivier Mueller <om-lists-bsd@omx.ch>
To: Arkadi Shishlov <arkadijs.sislovs@affecto.lv>
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Date: Wed, 06 May 2009 17:02:26 +0200
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Cc: freebsd-performance@freebsd.org
Subject: Re: filesystem: 12h to delete 32GB of data
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On Wed, 2009-05-06 at 16:15 +0300, Arkadi Shishlov wrote:
> Its probably "dirhash' that is not enabled or its cache is too small for the task.

$ sysctl -a |grep dirha
  UFS dirhash  1262   286K       -  9715683  16,32,64,128,256,512,1024,2048,4096
vfs.ufs.dirhash_docheck: 0
vfs.ufs.dirhash_mem: 2087495
vfs.ufs.dirhash_maxmem: 2097152
vfs.ufs.dirhash_minsize: 2560

So it's active, but probably too small as you suggest. Can I update this
value "on the fly" or does it require a reboot (+ settings in
loader.conf) ? 

regards,
Olivier