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Path: utzoo!linus!decvax!genrad!mit-eddie!godot!harvard!seismo!hao!pag
From: pag@hao.UUCP (Peter Gross)
Newsgroups: net.bugs.4bsd
Subject: tar(I) always reads and writes disk files in 512 byte chunks
Message-ID: <1245@hao.UUCP>
Date: Fri, 2-Nov-84 17:53:42 EST
Article-I.D.: hao.1245
Posted: Fri Nov  2 17:53:42 1984
Date-Received: Sun, 4-Nov-84 05:00:12 EST
Distribution: net
Organization: High Altitude Obs./NCAR, Boulder CO
Lines: 17

Index:	/usr/src/bin/tar.c 4.2BSD

Description:
	4.2bsd tar seems patched together from the older v7 and 4.1
	versions.  The old versions did all their disk I/O using
	512 byte blocks..  On 4.2 this is suboptimal and makes tar
	much slower than need be.
Repeat-By:
	write a tar tape of large files
		or
	extract a tar tape containing large files
Fix:
	Should be made to use st.blksize to set optimal block size
	for disk read/writes.  Unfortunately this entails a lot of rewriting.

--peter gross
hao!pag