The following reply was made to PR misc/27233; it has been noted by GNATS.

From: Arto Selonen <arto@selonen.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: misc/27233 (still confusing)
Date: Wed, 2 Feb 2005 10:25:46 +0200 (EET)

 Hi!
 
 There are still two explanations for the vm.bufcache:
 
 1) it is a percentage of total available RAM (different from physical RAM?)
 2) it is a percentage of kernel memory (whatever that is)
 
 I think #1 is the correct one (or closest to correct), see eg. 
 buf_memcalc() in src/sys/kern/vfs_bio.c.
 
 Currently, the following cover vm.bufcache (or options BUFCACHE):
 
  	- options(4); explained as #1
  	- sysctl(3); explained as #2
  	- 'sysctl -d vm.bufcache'; explained as #1 ?
 
 I guess this PR could be closed once sysctl(3) agrees with those two
 other explanations, although I'm not sure if options(4) and
 'sysctl -d vm.bufcache' mean the same thing or whether there is a
 meaningful difference there.
 
 
 Artsi
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