Date: Thu, 31 Jan 2002 11:58:47 +0000 From: Simon Dick <simond@irrelevant.org> To: Jacques Beigbeder <Jacques.Beigbeder@free.fr> Cc: freebsd-questions@freebsd.org, Dohy Hong <Dohy.Hong@ens.fr> Subject: Re: how to size memory? Message-ID: <20020131115847.GE461@irrelevant.org> In-Reply-To: <20020131123155.A10595@trefle.ens.fr> References: <20020131123155.A10595@trefle.ens.fr>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, Jan 31, 2002 at 12:31:55PM +0100, Jacques Beigbeder wrote: > Hardware (2 years old): > PC Dell Optiplex GX300 > 2 processors 800 Mhz > 256 Mo ECC RDRAM (in the Setup) > > Windows NT 4.0 says that the memory is 256 Mb. Perfect. > > But FreeBSD within the boot says: > FreeBSD 3.4-RELEASE #3: Thu Jan 31 09:47:44 CET 2002 > ... > real memory = 66707456 (65144K bytes) > avail memory = 61202432 (59768K bytes) > ... > > How can you explain this difference (64 Mb vs 256 Mb)??? Have a read of this from LINT, it may explain it: # MAXMEM specifies the amount of RAM on the machine; if this is not # specified, FreeBSD will first read the amount of memory from the CMOS # RAM, so the amount of memory will initially be limited to 64MB or 16MB # depending on the BIOS. If the BIOS reports 64MB, a memory probe will # then attempt to detect the installed amount of RAM. If this probe # fails to detect >64MB RAM you will have to use the MAXMEM option. # The amount is in kilobytes, so for a machine with 128MB of RAM, it would # be 131072 (128 * 1024). so you'll probably see your full memory if you put this in your kernel config file and rebuild your kernel: options MAXMEM="(256*1024)" -- Simon Dick simond@irrelevant.org "Why do I get this urge to go bowling everytime I see Tux?" To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20020131115847.GE461>