Date: Sun, 16 Nov 1997 10:21:07 +0200 (IST) From: Nadav Eiron <nadav@cs.technion.ac.il> To: "John S. Dyson" <toor@dyson.iquest.net> Cc: Alex <garbanzo@hooked.net>, tom@sdf.com, hackers@FreeBSD.ORG Subject: Re: 256Meg Message-ID: <Pine.GSO.3.95-heb-2.07.971116102017.12229B-100000@csd> In-Reply-To: <199711160742.CAA12053@dyson.iquest.net>
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On Sun, 16 Nov 1997, John S. Dyson wrote: > Alex said: > > > > > > On Fri, 14 Nov 1997, Tom wrote: > > > > > > > > On Fri, 14 Nov 1997, dennis wrote: > > > > > > > Is there a maximum that FreeBSD can support? > > > > > > > > Dennis > > > > > > > > > What? Filesystems? RAM? Something else? > > > > > > RAM... no problem. I'm running two 256MB RAM servers now. > > > > Actually, there's a limit of 4GB or so of ram, on the 486 (if you call > > tha ta limit ;-) ), and AFAIK the P5, P6 and PII and clones as well. > > > Physically, the limit is 36Bits on a P6. It would require some mods to > the pmap layer, and maybe some enhancements to the upper level VM code. > One disadvantage with the extended 3 level translation mode is that > the PTE's become twice as large. I seriously doubt that we'll need that > on a P6, but on future Slot1/Slot2 processors, we might find that 4GB > is a real limit, and have to accomodate the modified PTD/PTE format. > > Imagine a processor that is perhaps 2X to 5X as fast as a P6, in a > multiprocessor config -- that would appear to be able to use more than the typical There is such a processor! It's called an Alpha! (sorry, couldn't resists). > upper end of 1GByte of memory, and even more than the normally addressable > 4Gbytes. > > I haven't given this alot of thought yet, but these issues are probably going > to be important in the medium-term future (approx 1yr.) > > -- > John > dyson@freebsd.org > jdyson@nc.com > Nadav
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