Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!elroy!judy!stevo
From: stevo@judy.Jpl.Nasa.Gov (Steve Groom)
Newsgroups: comp.mail.uucp
Subject: Re: Send vs receive times
Message-ID: <7040@elroy.Jpl.Nasa.Gov>
Date: 15 Jun 88 19:25:44 GMT
References: <92@carpet.WLK.COM>
Sender: news@elroy.Jpl.Nasa.Gov
Reply-To: stevo@jane.jpl.nasa.gov (Steve Groom)
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Organization: Image Analysis Systems Grp, JPL
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In article <92@carpet.WLK.COM> bill@carpet.WLK.COM (Bill Kennedy) writes:
>I have noticed that my systems send much faster than they receive,
>i.e. 210 bytes/sec sending, 176 bytes/sec receiving from the other
>site.  Anyone else notice this?  Any thoughts?

Simple.  Reads on existing files are almost always faster than writes
to new files.  The reason is that on the reads, you don't have the
additional file system overhead of allocating disk blocks to write to.

This is also why file system dumps can be made to go so much faster than
restores.  On dumps, you're just reading the data.  On restores, you've
doing a lot of allocating of disk blocks to do too.


-steve
/* Steve Groom, MS 168-522, Jet Propulsion Laboratory, Pasadena, CA 91109
 * Internet: stevo@elroy.jpl.nasa.gov   UUCP: {ames,cit-vax}!elroy!stevo
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