Date: Tue, 17 Sep 1996 20:55:45 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: terry@lambert.org (Terry Lambert) Cc: dyson@freebsd.org, terry@lambert.org, dyson@celebration.net, dg@Root.COM, bde@zeta.org.au, proff@suburbia.net, freebsd-hackers@freebsd.org Subject: Re: attribute/inode caching Message-ID: <199609180155.UAA03535@dyson.iquest.net> In-Reply-To: <199609172311.QAA05000@phaeton.artisoft.com> from "Terry Lambert" at Sep 17, 96 04:11:55 pm
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> > > I have saved the original correspondence (or you can look it up in the > > > -current list archives, which I suggest you do so that there is no question > > > of me biasing the information) where we originally discussed the vclean > > > interface. In it, you claimed that device/extent and vnode/extent > > > mapping were irreconcilable because the device/extent mapping would > > > cause a reduction in the mappable region down to 2^31, the max filesize > > > (clearly, 31 pages == 4096/512 + 31 bits of blocks -- the origin of the 39). > > > > > maxfilesize is in units of bytes, right? > > Yes. > VM system addressibility is (2^31) * PAGE_SIZE = 2^43; I/O system addressibility is (2^31) * DEV_BSIZE = 2^40. There may have been some implementation limitations in the past, but those have been fixed (AFAIK.) John
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