Date: Tue, 22 Jul 2003 11:55:27 -0700 From: Sean Chittenden <sean@chittenden.org> To: Christopher Weimann <cweimann@k12hq.com> Cc: Paul Pathiakis <paul@pathiakis.com> Subject: Re: Tuning for PostGreSQL Database Message-ID: <20030722185527.GU64860@perrin.int.nxad.com> In-Reply-To: <20030722143449.B10666@smtp.k12us.com> References: <200307191818.13516.paul@pathiakis.com> <20030720110939.GN24507@perrin.int.nxad.com> <20030720164237.GC55392@nasby.net> <20030720205339.GP24507@perrin.int.nxad.com> <20030722143449.B10666@smtp.k12us.com>
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> > You might want to get in the habit of using sysctl for getting > > that kind of info. `sysctl -d vfs.bufspace` > > I'm confused. Everything I have ever read about FreeBSD indicates > that it uses all free ram for the disk cache. >From loader(8): kern.maxbcache Limits the amount of KVM reserved for use by the buffer cache, specified in bytes. The default maximum is 200MB. This parameter is used to prevent the buffer cache from eating too much KVM in large-memory machine configurations. Only mess around with this parameter if you need to greatly extend the KVM reservation for other resources such as the swap zone or NMBCLUSTERS. Note that the NBUF parameter will override this limit. Modifies VM_BCACHE_SIZE_MAX. -sc -- Sean Chittenden
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