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Newsgroups: comp.unix.bsd.freebsd.misc Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.mel.connect.com.au!munnari.OZ.AU!news.ecn.uoknor.edu!news.cis.okstate.edu!col.hp.com!nntp.coast.net!howland.reston.ans.net!swrinde!cs.utexas.edu!uunet!in1.uu.net!DIALix!melbourne.DIALix.oz.au!seeware!mark From: mark@seeware.DIALix.oz.au (Mark Hannon) Subject: Re: ???---RAM vs cache : is 256k cache enough for 24M RAM ---??? Organization: SeeWare Software Message-ID: <DKFJoD.EIq@seeware.DIALix.oz.au> References: <4bc3g4$eo@docder.demon.co.uk> <4brk1q$dt8@hustle.rahul.net> Date: Sun, 31 Dec 1995 02:45:49 GMT Lines: 43 Bill Hogan (bhogan@rahul.net) wrote: : dmitri (100334.712@compuserve.com) wrote: : : I've got 486DX-2,66 computer with 8M RAM, 256k cache and thinking to add 8 or : : 16 M more. The motherboard is not upgradable to more cache. As I heard too much : : RAM can slow down system without adding cache. What is the ratio RAM vs. cache? : : Thank you. : : ---- : : Dmitri : If you have 256kn sram cache, your mb should I think be able to cache : RAM addresses as high as 32mb. : 128K sram cache is only good up to 16MB ram. : The moment you go past 16mb ram, you have to increase your cache because : otherwise the ram > 16mb will simply be not cached. : I have 20MB RAM and only 128kb cache, so I enable the "limit RAM to : 16MB" option when I compile the Linux kernel. Hi all, Saw this in a linux newsgroup. Is this a general motherboard problem or is it only some types of 486 motherboards?? Has anybody done any tests to see if RAM over 20MB really slows things down? I am using a 486 DX33 with 20MB RAM and 128KB cache and things are reasonably snappy (I had 8MB before and it's much faster than this!) Is there anyway I can test/measure the difference between 16MB and 20MB? ie can I stop the kernel from using >16MB? If I do this can I use the 4MB for anything useful? Regards, Mark -- +-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+ | Mark Hannon,| FreeBSD - Free Unix for your PC| mark@seeware.DIALix.oz.au| | Melbourne, | PGP key available by fingering | epamha@epa.ericsson.se | | Australia | seeware@melbourne.DIALix.oz.au | |