Date: Wed, 11 Dec 1996 09:23:42 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: bde@zeta.org.au (Bruce Evans) Cc: jkh@time.cdrom.com, cvs-all@freefall.freebsd.org, CVS-committers@freefall.freebsd.org, cvs-sys@freefall.freebsd.org, dyson@freefall.freebsd.org Subject: Re: cvs commit: src/sys/ufs/ufs ufs_readwrite.c Message-ID: <199612111423.JAA03249@dyson.iquest.net> In-Reply-To: <199612110216.NAA27773@godzilla.zeta.org.au> from "Bruce Evans" at Dec 11, 96 01:16:28 pm
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> > There are a number of clones of the cmp and cp code in the tree. E.g., > xinstall.c has a version of cmp with an arbitrary 8MB limit like cp. > It's not clear that the mmap() version is faster than the read() version. > The mmap version has almost always recently been faster than read() when the file is already cached. Also, cp isn't nearly as bad as cmp when actually reading from disk (due to the disk head contention that cmp causes.) John
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