Date: Fri, 01 Feb 2002 12:46:42 +0100 From: Mathieu Arnold <ma@absolight.fr> To: FreeBSD questions <freebsd-questions@FreeBSD.ORG> Subject: Re: the LINT file Message-ID: <3C5A8022.E87CEF88@club-internet.fr> References: <3C5A7FBC.CC58C4ED@club-internet.fr>
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Mathieu Arnold wrote: > > I'm actually upgrading one of my test box from 4_4 to 4_5, and I > stumbled on this : > > # Tune the kernel malloc area parameters. VM_KMEM_SIZE represents the > # minimum, in bytes, and is typically (12*1024*1024) (12MB). > # VM_KMEM_SIZE_MAX represents the maximum, typically 200 megabytes. > # VM_KMEM_SIZE_SCALE can be set to adjust the auto-tuning factor, which > # typically defaults to 4 (kernel malloc area size is physical memory > # divided by the scale factor). > # > options VM_KMEM_SIZE="(10*1024*1024)" > options VM_KMEM_SIZE_MAX="(100*1024*1024)" > options VM_KMEM_SIZE_SCALE="4" > > the comment says that VM_KMEM_SIZE is set to 12MB but it's set to 10, > and that _MAX is set to 200 but it's set to 100... > I heard once that if the comment and the code differed, they were both > wrong :) > so, what should be the default values ? adding to myself : # Tune the buffer cache maximum KVA reservation, in bytes. The maximum is # usually capped at 200 MB, effecting machines with > 1GB of ram. Note # that the buffer cache only really governs write buffering and disk block # translations. The VM page cache is our primary disk cache and is not # effected by the size of the buffer cache. # options VM_BCACHE_SIZE_MAX="(100*1024*1024)" it says 200M in the comment, but 100 in the code # Tune the swap zone KVA reservation, in bytes. The default is typically # 70 MB, giving the system the ability to manage a maximum of 28GB worth # of swapped out data. # options VM_SWZONE_SIZE_MAX="(50*1024*1024)" 70 -> 50... -- Mathieu Arnold To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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