Date: Wed, 2 Jun 1999 17:13:01 -0400 (EDT) From: Zhihui Zhang <zzhang@cs.binghamton.edu> To: freebsd-fs@freebsd.org Subject: allocate file blocks contiguously Message-ID: <Pine.GSO.3.96.990602170017.26420A-100000@sol.cs.binghamton.edu>
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In FFS, there is a parameter called maxcontig (default to 16) that determines the number of blocks we can allocate contiguously for a single file. What is its optimal value? I mean, if we allocate ALL the data blocks of a very big file contiguously, will its I/O performance be improved greatly? It seems to me this number may also be limited by system buffering capability (MAXPHYS?) and underlying hardware controller. Can anyone give me some hints on the choice of the value of maxcontig? Any help is appreciated. -------------------------------------------------- Zhihui Zhang. Please visit http://www.freebsd.org -------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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