Date: Thu, 21 Feb 2002 08:21:00 +0100 From: =?ISO-8859-1?B?U/hyZW4gTmVpZ2FhcmQ=?= <neigaard@e-box.dk> To: Erik Trulsson <ertr1013@student.uu.se> Cc: Alex <akruijff@dds.nl>, Alex <FreeBSD@cybertron.tmfweb.nl>, questions@freebsd.org Subject: Re[2]: OT: Re: Max RAM supported by Hardware Message-ID: <193651536.20020221082100@e-box.dk> In-Reply-To: <20020220220028.GA21515@student.uu.se> References: <1556477954.20020220210026@e-box.dk> <14217053982.20020220215646@cybertron.tmfweb.nl> <15518324328.20020220221756@cybertron.tmfweb.nl> <20020220220028.GA21515@student.uu.se>
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Wednesday, February 20, 2002, 11:00:28 PM, Erik wrote: ET> On Wed, Feb 20, 2002 at 10:17:56PM +0100, Alex wrote: ET> Sorry, but you just don't seem to understand how things work. ET> With a 32-bit address space the maximum amount of memory that can be ET> addressed is 2^32 = 4Gigabytes. This is also the max that FreeBSD ET> supports on i386. Great - So I did understand it right then :) ET> There should be no need to recompile anything. ET> (Although there has been some reports of problems with >2G but I think ET> that has been fixed now.) That sounds super, I love FreeBSD, it's so much easier than any other OS I have tried :) ET> Modern x86 CPUs (Pentium Pro and later) can address up to 2^36 (=64G) ET> bytes of memory. To use the extra memory requires you to play some ET> tricks with the MMU (Memory Management Unit) to map the memory into the ET> 4G address space. Even then you cannot really have a single process use ET> more than 4G. This capability is currently not supported by FreeBSD ET> and to support it would require some fairly serious rewriting of parts ET> of the kernel. Ok ET> On Alpha the max that is supported is 2G. I am not sure why that ET> limitation exists but it does. Strange - It should be able to support much much more. I guess FreeBSD is mostly for i386, right? Not much being done for other platforms? -- Med venlig hilsen/Best regards, Søren Neigaard mailto:neigaard@e-box.dk To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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