Date: Thu, 24 Feb 2005 23:10:09 +0100 (CET) From: "Lars Kristiansen" <lars+lister.freebsd@adventuras.no> To: FreeBSD-gnats-submit@FreeBSD.org Cc: Lars Kristiansen <lars+lister.freebsd@adventuras.no> Subject: docs/78041: docs for md need further explanation of type swap Message-ID: <55421.213.236.228.129.1109283009.squirrel@mail.adventuras.no> Resent-Message-ID: <200502242220.j1OMKLNN019472@freefall.freebsd.org>
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>Number: 78041 >Category: docs >Synopsis: docs for md need further explanation of type swap >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-doc >State: open >Quarter: >Keywords: >Date-Required: >Class: change-request >Submitter-Id: current-users >Arrival-Date: Thu Feb 24 22:20:21 GMT 2005 >Closed-Date: >Last-Modified: >Originator: Lars Kristiansen <lars+lister.freebsd@adventuras.no> >Release: FreeBSD 5.3-RELEASE i386 >Organization: Adventuras >Environment: System: FreeBSD ladyda.master.local 5.3-RELEASE FreeBSD 5.3-RELEASE #1: Fri Nov 12 20:41:58 CET 2004 root@ladyda.master.local:/usr/obj/usr/src/sys/GENERIC i386 >Description: Documentation describes memory disks of type swap as allocated from swap space which leads to believe they are diskbound. This description in a mail from Scott Long to freebsd-fs explains otherwise: ( http://docs.freebsd.org/cgi/mid.cgi?41E01905.3040200 ) "With the swap option, pages are allocated from the buffer/cache and held there. They are only swapped to disk when the system is under memory pressure, otherwise they stay in RAM." or this one in a mail from Poul-Henning Kamp: ( http://docs.freebsd.org/cgi/mid.cgi?45044.1105365790 ) "Swap-backing is very different from RAM disks in that things get pushed out of RAM if better use can be made of the pages." >How-To-Repeat: >Fix: ############### suggested patch from Lowell Gilbert: ############### --- src/share/man/man4/md.4.ORIG Thu Feb 24 11:51:37 2005 +++ src/share/man/man4/md.4 Thu Feb 24 11:51:51 2005 @@ -50,7 +50,7 @@ This allows for mounting ISO images without the tedious detour over actual physical media. .It Cm swap -Backing store is allocated from swap space. +Backing store is allocated from virtual memory space. .El .Pp For more information, please see ############### end of patch ############### Note: Documents which could use corresponding changes includes the manpages for md, mdconfig and mdmfs, and also in this chapter of the handbook: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/disks-virtual.html#DISKS-MD-FREEBSD5 >Release-Note: >Audit-Trail: >Unformatted:
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