Date: Thu, 5 Oct 2000 23:28:05 +0200 From: Wilko Bulte <wkb@freebie.demon.nl> To: Doug Rabson <dfr@nlsystems.com> Cc: Matthew Jacob <mjacob@feral.com>, FreeBSD-alpha mailing list <freebsd-alpha@freebsd.org> Subject: Re: max memory on Alpha? Message-ID: <20001005232805.B7134@freebie.demon.nl> In-Reply-To: <Pine.BSF.4.21.0010042345000.94692-100000@salmon.nlsystems.com>; from dfr@nlsystems.com on Wed, Oct 04, 2000 at 11:46:29PM %2B0100 References: <20001003212847.A1868@freebie.demon.nl> <Pine.BSF.4.21.0010042345000.94692-100000@salmon.nlsystems.com>
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On Wed, Oct 04, 2000 at 11:46:29PM +0100, Doug Rabson wrote: > On Tue, 3 Oct 2000, Wilko Bulte wrote: > > > On Tue, Oct 03, 2000 at 11:57:55AM -0700, Matthew Jacob wrote: > > > On Tue, 3 Oct 2000, Wilko Bulte wrote: > > > > > > > What is the currently max supported memory size on Alpha? 2Gb maybe? > > > > Or will 4Gb also be OK? > > > > > > > > Reason for asking is that I want to try a AS8400 who is equipped > > > > with 3x 4Gb memory module. > > > > > > I've run 8400s up to 2GB. Any more than that and you'll find that S/G > > > DMA hasn't been finished ;-). > > > > Well, on 12Gb it panics with pmap_foo <don't remember what foo was > > off the top of my head> on 4.1-R ;-) Might this mean it cannot create the > > necessary page table admin on > 2Gb? > > > > Do you know *if* there is a hard limit at 2Gb? > > I don't think there is a *hard* limit for the basic VM system but I > imagine it might have problems finding a large enough contiguous region to > map the vm_page_t structures. The main limitation is in the i/o system as > previously noted. From looking at the code it would be instructive to compile a kernel with DEBUG_CLUSTER and see what is says (hopefully before panicing ;-) I need a sensible -current built first (my -current disk that I carry around from machine to machine is a bit whacko). Hmm, or maybe -stable is easier.. Will see what I can do. W/ -- Wilko Bulte wilko@freebsd.org Arnhem, the Netherlands To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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