From owner-freebsd-alpha Tue Oct 3 12:26:56 2000 Delivered-To: freebsd-alpha@freebsd.org Received: from post.mail.nl.demon.net (post-10.mail.nl.demon.net [194.159.73.20]) by hub.freebsd.org (Postfix) with ESMTP id 4160C37B503 for ; Tue, 3 Oct 2000 12:26:54 -0700 (PDT) Received: from [212.238.54.101] (helo=freebie.demon.nl) by post.mail.nl.demon.net with smtp (Exim 3.14 #2) id 13gXiG-0006f7-00; Tue, 03 Oct 2000 19:26:53 +0000 Received: (from wkb@localhost) by freebie.demon.nl (8.11.0/8.11.0) id e93JSlA01931; Tue, 3 Oct 2000 21:28:47 +0200 (CEST) (envelope-from wkb) Date: Tue, 3 Oct 2000 21:28:47 +0200 From: Wilko Bulte To: Matthew Jacob Cc: FreeBSD-alpha mailing list Subject: Re: max memory on Alpha? Message-ID: <20001003212847.A1868@freebie.demon.nl> References: <20001003200741.A1318@freebie.demon.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2i In-Reply-To: ; from mjacob@feral.com on Tue, Oct 03, 2000 at 11:57:55AM -0700 X-OS: FreeBSD 4.1-STABLE X-PGP: finger wilko@freebsd.org Sender: owner-freebsd-alpha@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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 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? > Also, haha, you'll find that ECC errors aren't corrected, since TLASER screwed > the pooch wrt ALPHA spec and requires you to run around and fix ECC errors > induced by the I/O boards. Que? This is real UNIX[tm]: expect nothing but flawless hardware (like the error free disk packs on the PDP; worth their weight in gold ;-) > Since I now, for the first time in 4 years, have a real external customer who > actually might run TLAser, I guess I'd better finish this, hadn't I? Well, I'd like to impress a few of the T64 folks. BTW: it has 8 EV5/625 CPUs, so it is a good SMP testbed as well. 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