Date: Thu, 16 May 1996 00:22:53 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: alc@cs.rice.edu (Alan Cox) Cc: questions@FreeBSD.ORG Subject: Re: Size of the Virtual Memory Page Message-ID: <199605160522.AAA00186@dyson.iquest.net> In-Reply-To: <199605160402.XAA00946@noel.cs.rice.edu> from "Alan Cox" at May 15, 96 11:02:12 pm
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> > P.S. Theoretically, you could do the same thing on the x86. John (Dyson), > have you ever thought of trying this just for grins? Some stuff would likely > break, but... :-) > I have thought about it (in passing.) Actually, it could decrease overhead in some cases, at the expense of memory. 8/16K pages *might* be interesting. The VM and vfs_bio system (after my changes) will have problems with bigger than 16K pages. I am sure that they could be worked around. The limitation has to do with the bit-mask that I use for valid and dirtyness being in 512 byte increments. We have 32bits/word, so that means that 16K is kind of the max (if you ignore long-longs.) Long-longs would bring it up to 32K. I would guess that 64K might be cool also, but require a few changes. John
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