Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!zaphod.mps.ohio-state.edu!tut.cis.ohio-state.edu!snorkelwacker!ira.uka.de!smurf!gopnbg!tmpmbx!einoed!alh
From: alh@einoed.UUCP (Adrian Le Hanne)
Newsgroups: comp.unix.i386
Subject: Re: dd curiosity
Message-ID: <1990Jan5.122721.21642@einoed.UUCP>
Date: 5 Jan 90 12:27:21 GMT
References: <396@zok.UUCP>
Organization: Einoed Systemberatung, Berlin
Lines: 19

mark@zok.UUCP (Mark W. Snitily) writes:

>For example, if I write 4 sectors into the partition starting at sector

>But, if I read 4 sectors from the partition starting at sector 20000,
>the read will take forever to complete, (i.e. we're talking minutes to
[...]
>Anyone have any ideas why reading with dd takes so long?

A write is stored in the buffer cache while a read must access the storage 
directly to get (uncached) data.

>-- Mark

Adrian
-- 
Adrian S. Le Hanne           ..!tmpmbx!einoed!alh                    alh@einoed
Einoed Systemberatung. Joachimstalerstr.19, 1000 Berlin 15. Tel.:030 / 88000335
             "Le plus semblable aux morts meurt le plus 'a regret"