Date: Sat, 05 Jul 2008 08:24:29 -0400 From: Boris Kochergin <spawk@acm.poly.edu> To: Robert Heron <robert@heron.pl> Cc: freebsd-bugs@freebsd.org Subject: Re: FreeBSD 7.0 and RAM limit Message-ID: <486F67FD.9000200@acm.poly.edu> In-Reply-To: <B23713B9-F2DD-41B8-A557-B51AF3BE73A1@heron.pl> References: <B23713B9-F2DD-41B8-A557-B51AF3BE73A1@heron.pl>
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Robert Heron wrote: > Hi, > > I use: > > FreeBSD 7.0-R on i386 server with motherboard S5000VSA and 6GB RAM > onboard. BIOS version - 88 (the latest) > > Kernel includes: options MAXMEM=(6*1024*1024) > > And FreeBSD reports only: > > real memory = 2680160256 (2556 MB) > avail memory = 2617892864 (2496 MB) > > Why? What is wrong that FreeBSD sees only about 2.5GB instead of 6GB? > > Robert > > _______________________________________________ > freebsd-bugs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-bugs > To unsubscribe, send any mail to "freebsd-bugs-unsubscribe@freebsd.org" You probably have to compile your kernel with the PAE(4) option, as the i386 architecture only supports up to 4 GiB without physical address extentions, and some of it (512 MiB, I believe) is made unavailable to the operating system because that address space is reserved for PCI. -Boris
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