Conference 7.286::fddi

1546.0. "Performance question" by ANNECY::MAIGRET_Y () Fri Dec 30 1994 05:41

    HI,
    
    I have a novice question, about FDDI. In fact, this
    question comes from my customer who had a look in the "Performance
    Analysis of FDDI Token Ring Networks" document written by Raj Jain.
    
    The question is:
    
    Do we change the FDDI performances when we use it to send only 1500 packets 
    of 40 bytes per second. In fact FDDI is design to support high
    performance transfer rate, could we have some problem of performances,
    or setting, if we use it in for low transfer rate. 
    
    We proposed to use FDDI for its availability, reliability (dual ring), 
    throughput performances, and evolution. The customer's
    applications do not really need a very high throughput (1500 packets of
    40 bytes/second), but they need a VERY fast speed transfer, and a reliable
    network.
    
    Is FDDI a good solution, when we have a low throughput for the
    application, but when we want performances.
    
    
    Regards,
    Yves.
    
    

    >>Do we change the FDDI performances when we use it to send only 1500 packets 
    >>of 40 bytes per second. In fact FDDI is design to support high
    >>performance transfer rate, could we have some problem of performances,
    >>or setting, if we use it in for low transfer rate. 
    
    I don't understand.  If you're asking whether or not FDDI can handle
    throughput of 40 bytes/second (320 bits/second) the answer is a
    resounding yes.  Of course, if the throughput is THAT low, you should
    probably consider using serial line rather than FDDI!
    
    If you want to send 1500*40 bytes/second then that translates to
    480,000 bits/second which is well under the 100,000,000 bits/second
    maximum of FDDI.  You'd be using less network bandwidth if your
    customer's applications can send 4KBytes or larger packets, but the
    applications should still work regardless.
    
       - Larry