Date: Thu, 17 Aug 2000 10:01:01 -0500 (CDT) From: Mark Tinguely <tinguely@plains.NoDak.edu> To: lplist@closedsrc.org, u98jobj@stud.hh.se Cc: freebsd-questions@FreeBSD.ORG, hosting@webcrossing.com Subject: RE: Max Memory question Message-ID: <200008171501.KAA26216@plains.NoDak.edu>
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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
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