Date: Tue, 10 Dec 1996 22:00:36 -0800 From: "Jordan K. Hubbard" <jkh@time.cdrom.com> To: John Dyson <dyson@freefall.freebsd.org> Cc: CVS-committers@freefall.freebsd.org, cvs-all@freefall.freebsd.org, cvs-sys@freefall.freebsd.org Subject: Re: cvs commit: src/sys/ufs/ufs ufs_readwrite.c Message-ID: <2419.850284036@time.cdrom.com> In-Reply-To: Your message of "Tue, 10 Dec 1996 21:17:26 PST." <199612110517.VAA14335@freefall.freebsd.org>
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> makes MADV_SEQUENTIAL much more effective. I suggest that > we start using MADV_SEQUENTIAL on system utilities that mmap > their input files, and the I/O is predominantely sequential. I was wondering whether or not cp(1) would benefit from this, then I noticed that its mmap() handling had been made conditional on VM_AND_BUFFER_CACHE_SYNCHRONIZED, which is not defined. I thought they had been for a long time. :-) Or is this #ifdef just poorly named? Would #ifdef MMAP_ACTUALLY_BOUGHT_US_PERFORMANCE .. #endif Be more appropriate? Jordan
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