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Article #15539

Re: Need help selecting Ethernet cards for very high throughput rates.

#15539
From: Alfred Kayser
Date: Fri, 30 Aug 1991 07:42
37 lines
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dwex@cbnewsj.cb.att.com (david.e.wexelblat) writes:
>In article <1991Aug29.134749.5982@ctr.columbia.edu> bill@connection.prospect.com (Bill Poitras) writes:
>> In article <1991Aug29.041708.29784@unislc.uucp> martin@unislc.UUCP (Martin Cryer,D1Z01,5754) writes:
>> >I think you are asking too much of a timesharing O/S even with an EISA
>> >PC to get sustained 6Mbytes/s. If you only want it for bursts, you
>> >may have better luck.
On normal systems it is more around 100-500Kb/s !!

>> Are you kidding?  I have seen 100Mbytes/s when ftping a file to a PS/2
>> running AIX with a ESDI controller and 16 bit ethernet controller.  I can
>> consitently get 20Mbytes/s.  Hell, I can get 11Mbytes/s sometimes to a PC
>> running DOS.  This is a ISA machine with a 16bit RLL controller.  I don't
>> see your problem.
Jokes like these belong in rec.humor!!!!!

>Am I missing something here?  Isn't Ethernet a 10Mb/sec network?  How,
>exactly, does one one 100Mbytes/sec over a medium that only supports
>10Mb/sec?  Or are you using FDDI?  Or maybe I have no clue?
Indeed, ethernet is 10Mbits/sec, so 1.25Mbytes is theoratical maximum.
However the statistics reported by FTP are mostly very wrong,
especially for small files. The timer granularity used by ftp is too large
to accurately measure actual throughputs. Also I've detected that not
all is sent when the socket is closed. After the socket close there are
still packets going over ethernet.

Thanks anyway for the joke, Alfred


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>Middletown, NJ  07748       | (908) 957-5871        | --Damn Yankees
--
-- Ir. Alfred Kayser. PACS, OS/2, TCP/IP. --- Email: AKayser@et.tudelft.nl --
-- CARDIT, Delft University of Technology ------------ Tel: (31)-15-786179 --
-- P.O.Box 5031, 2600 GA Delft, The Netherlands ------ Fax: (31)-15-784898 --
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Path: arc1-ca.pugleaf.net!gmdzi!unido!mcsun!hp4nl!donau!alfred
References: <1991Aug27.192220.20958@world.std.com> <1991Aug29.041708.29784@unislc.uucp> <1991Aug29.134749.5982@ctr.columbia.edu> <1991Aug29.144609.17384@cbnewsj.cb.att.com>

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From: AKayser@dnpap.et.tudelft.nl (Alfred Kayser)
Newsgroups: comp.protocols.tcp-ip,comp.protocols.tcp-ip.ibmpc,biz.sco.general,comp.unix.sysv386,comp.unix.wizards
Subject: Re: Need help selecting Ethernet cards for very high throughput rates.
Message-ID: <alfred.683538169@dutepp13>
Date: 30 Aug 91 07:42:49 GMT
References: <1991Aug27.192220.20958@world.std.com> <1991Aug29.041708.29784@unislc.uucp> <1991Aug29.134749.5982@ctr.columbia.edu> <1991Aug29.144609.17384@cbnewsj.cb.att.com>
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