Date: Mon, 26 Aug 1996 11:14:07 +0200 (MESZ) From: "Hr.Ladavac" <lada@ws2301.gud.siemens.co.at> To: sysseh@devetir.qld.gov.au (Stephen Hocking) Cc: freebsd-fs@freebsd.org, current@freebsd.org Subject: Re: The VIVA file system (fwd) Message-ID: <199608260914.AA242520847@ws2301.gud.siemens.co.at> In-Reply-To: <199608250335.DAA21536@netfl15a.devetir.qld.gov.au> from "Stephen Hocking" at Aug 25, 96 03:35:19 am
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E-mail message from Stephen Hocking contained: Anybody have opinions on this vs LFS? Are we still waiting for the Lite-2 stuff, before LFS can go in? > The package contains a paper on VIVA by its developers, Eric H. Herrin > II > and Raphael A. Finkel, and a report on implementing VIVA in Linux by > Shankar Pasupathy. A brief description of VIVA follows. > > The VIVA filesystem was designed to minimize the time taken for file > operations. VIVA achieves this goal by using an allocation policy that > clusters sequentially accessed disk blocks so that disk-head movement > is minimized. VIVA also uses this clustering to compress block addresses > in an inode from 32 bits to 1 bit, relative to traditional filesystems. > This compression allows us to access about 800KB of data without using > indirect blocks. Benchmark results of our implementation of VIVA in the > Linux kernel show that it is much faster than Ext2, the default Linux > filesystem, for common file operations. > > The Linux implementation of VIVA is a "work in progress". It does not > yet handle partitions larger than 64M (so that the allocation bitmap > fits readily in memory). Individual files are limited to about 8M > (inodes currently have only a single indirect block). There are no > fragments; block size is restricted to 1K. (Adding logical blocks of > larger size will relieve some of these limitations.) Sounds sort of like clustering FFS if I'm reading this correctly. Okay, with a lessened need for indirect blocks, but with a typical unix file length distribution, I don't think they gain overmuch. /Marino > > Shankar Pasupathy > (shankar@pop.uky.edu) > > >
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