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From: pace@tabarzin.usace.mil (Joe Pace)
Newsgroups: comp.protocols.tcp-ip
Subject: Strange slowness
Message-ID: <1991May30.032710.3205@usace.mil>
Date: 30 May 91 03:27:10 GMT
Sender: pace@usace.mil (Joe Pace)
Organization: US Army Corps of Engineers, Sacramento District
Lines: 47

We have a strange problem when sending data between an Intergraph
workstation and an HP 9000/340, the transfer rate seems to be
very slow (about 500K/minute) compared to other machines (Sun, Unisys,
Apollo) sending the same data to the same HP using the same method.

The network looks like this:

																   
  Sun   Apollo   Intergraph           Unisys                       
   |      |           |                 |                          
---+------+-----------+-----------+-----+------------ (Thick net)
                                  |                                
                             PC Router (Ka9q - IBM AT)                    
                                  |                                
                  -----+----------+----- (Thin Net)                
                       |                                           
                   HP 9000/340                                     
                                                                   
                                                                   
                                                                   
The command being issued from the Sun, Apollo, Unisys, and Intergraph is:

   tar cvfb - 20 . | dd ibs=20b obs=1k | rsh hp-9000 "dd ibs=1k of=data"

The file grows at a rate of about 5 megs/minute when using the
Sun, Apollo, and Unisys machines, but grows by only about 500K/minute
when sending from the Intergraph.

The Intergraph machine does not exhibit this problem when sending to
other Intergraphs or Apollo machines, and is able to transfer
at about 5 megs/minute when sending the data via an Apollo, i.e.,

  ... | rsh apollo "dd bs=1k | rsh hp-9000 'dd ibs=1k of=data' "

Using FTP to copy files exhibits the same behavior.

Does this sound like a familier problem?  It seemd odd that this
is only affecting the Intergraoh machines.

Thanks 

  Joe
-- 
Joe Pace
US Army Corps of Engineers                                     pace@usace.mil
Sacramento District                                     JPPACE@UCDAVIS.BITNET
650 Capitol Mall, Sacramento, CA  95814         (916) 551-1133, FAX: 551-1100