Date: Mon, 15 Sep 2003 16:05:20 +1000 From: Peter Jeremy <peter.jeremy@alcatel.com.au> To: Irvine Short <irvine@sanbi.ac.za> Cc: freebsd-stable@freebsd.org Subject: Re: Large memory issues on 4-STABLE Message-ID: <20030915060520.GS430@gsmx07.alcatel.com.au> In-Reply-To: <20030915070012.U36360@fling.sanbi.ac.za> References: <20030913092804.S46465@fling.sanbi.ac.za> <20030913123257.C51554@fling.sanbi.ac.za> <20030914162113.GA89177@dds.nl> <20030915070012.U36360@fling.sanbi.ac.za>
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On 2003-Sep-15 07:07:26 +0200, Irvine Short <irvine@sanbi.ac.za> wrote: >However we have a situation where if I set MAXDSIZ to 2048 or above then >things break, so FreeBSD right now has an effectivce limit of 2GB per >process. +/- a GB or so, yes. This is a side-effect of userland and the kernel living within the same address space. It is possible for the kernel and userland to use different address spaces - most of the PDP-11 Unices did this - but I don't believe it's been done on any of the 32-bit or higher Unices. Implementing on an i386 would be very messy. >This is relevant to the work we're doing - some of my users actually >really do need this amount of memory. PAE is at best a kludge. If you really need a large RAM configuration, I strongly suggest you start saving for a 64-bit system. Peter
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