From owner-freebsd-questions Thu Aug 17 8: 1:14 2000 Delivered-To: freebsd-questions@freebsd.org Received: from plains.NoDak.edu (plains.NoDak.edu [134.129.111.64]) by hub.freebsd.org (Postfix) with ESMTP id 3CDFD37B635 for ; Thu, 17 Aug 2000 08:01:09 -0700 (PDT) Received: (from tinguely@localhost) by plains.NoDak.edu (8.9.3/8.9.3) id KAA26216; Thu, 17 Aug 2000 10:01:01 -0500 (CDT) Date: Thu, 17 Aug 2000 10:01:01 -0500 (CDT) From: Mark Tinguely Message-Id: <200008171501.KAA26216@plains.NoDak.edu> To: lplist@closedsrc.org, u98jobj@stud.hh.se Subject: RE: Max Memory question Cc: freebsd-questions@FreeBSD.ORG, hosting@webcrossing.com Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Wed, 16 Aug 2000, Joel Bjork mumbled: > If I recall correctly the 4GB memory limit is due to the x86 structure. There > is some info on this on the cdrom.com homepage but I can't find it. Basically > it said that they were thinking of moving to Alpha architecture to be able to > handle more requests. even with more addressing bits, the VM code would have to be rewritten to support more that 4 GB of RAM, because the FreeBSD's Intel physical page map contains pointers to 1024, 4KB pages. eventhough, the Alpha the addresses are larger and a single page map holds less pointers, they use another layer of pmap pointers giving a much larger potential address space. --mark tinguely. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message