Path: utzoo!utgpu!cunews!bnrgate!brtph3!brchh104!brchs1!bnr.ca!rice.edu!sun-spots-request
From: art@opal.acc.com (Art Berggreen)
Newsgroups: comp.sys.sun
Subject: Re: FTP gives weird trasfer rates on SunOS 4.1
Keywords: Networks
Message-ID: <2244@brchh104.bnr.ca>
Date: 2 Apr 91 15:00:00 GMT
Sender: news@brchh104.bnr.ca
Organization: Sun-Spots
Lines: 12
Approved: Sun-Spots@rice.edu
X-Original-Date: Mon, 1 Apr 91 18:35:44 GMT
X-Refs:  Original: v10n59
X-Sun-Spots-Digest: Volume 10, Issue 66, message 6
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In article <2034@brchh104.bnr.ca> rd@chorus.fr writes:
>There's a minor bug in SunOS 4.1's ftp command that cause it to print
>crasy transfer rates. For instance, this is the result from a FTP transfer
>between two Sparcs running SunOS4.1 and connected by a 9600 bauds leased
>line:

>9931 bytes sent in 1e-06 seconds (9.7e+06 Kbytes/s)

You are probably only seeing this on short files.  I believe this is due
to the fact that FTP calculates time to when the last write completes, NOT
when the data is completely delivered.  Thus, when the file is less than
the TCP window, the time is just enough to copy it to the kernel.