Date: Tue, 3 Oct 2000 12:28:46 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Wilko Bulte <wkb@freebie.demon.nl> Cc: FreeBSD-alpha mailing list <freebsd-alpha@FreeBSD.ORG> Subject: Re: max memory on Alpha? Message-ID: <Pine.LNX.4.21.0010031225430.12214-100000@zeppo.feral.com> In-Reply-To: <20001003212847.A1868@freebie.demon.nl>
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> 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 dunno. Doug would be the one to know. I was supposed to look into this for the Rawhide, but all I ever got was 1.5GB. I could do a book exercise and look at it, but (see below). > > > 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 ;-) Feh. Quote from a DEC Field Service Tech, 1977, Portland Oregon, after replacing the RP06 for the 4th time: "Damned Unix does single 512 byte sector I/O all over the pack- RP06 was designed for RSTS with 8 block clustering....." > > > 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. Yes- I'm still struggling to clear a block of time to help more with this. I had to move offices and other stuff happened as well - I'm still about 1.5 meters underwater. -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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