21143 problem

[Terry_Rolon]

You're right, setting only one side if the link to a fixed mode while the
other is still in auto is asking for trouble.

tr



At 10:56 PM 11/4/98 -0500, Robert G. Brown wrote:
>
>On Wed, 4 Nov 1998, Douglas Eadline wrote:
>
>> netperf calls:
>> ./netperf -t UDP_STREAM -p 12865 -n 2 -l 60 -H coyote3 -- -s 65535 -m 1472
>> ./netperf -t TCP_STREAM -p 12865 -n 2 -l 60 -H coyote3
>> 
>> The netperf results are:
>> 
>> UDP UNIDIRECTIONAL SEND TEST to coyote3
>> Socket  Message  Elapsed      Messages
>> Size    Size     Time         Okay Errors   Throughput
>> bytes   bytes    secs            #      #   10^6bits/sec
>> 
>>  65535    1472   60.00      487486      0      95.68
>>  65535           60.00      487458             95.68
>> 
>> TCP STREAM TEST to coyote3
>> Recv   Send    Send
>> Socket Socket  Message  Elapsed
>> Size   Size    Size     Time     Throughput
>> bytes  bytes   bytes    secs.    10^6bits/sec
>> 
>>  65535  65535  65535    60.04       3.65
>
>This is very similar to a problem I reported some months ago for a Cisco
>Cat5000 switch.  We found empirically that if one set the port speed of
>the switch externally (e.g., actually set the port to 100BT FD with the
>switch control software) that this would occur.  Some sort of framing
>error was occuring that allowed packets through but corrupted them.  I'm
>sure that if one actually examined the UDP packets received that there
>are bit errors in most of them.  We saw this with more than one kind of
>NIC but it was worst with tulips.
>
>When we set the ports to auto (so they would negotiate with the NIC) the
>problem went away.  The only person at the time who reported seeing the
>same thing was Greg Lindahl on pretty much the same hardware.  This
>sounds like the second time it might have occurred.  Is the switch port
>set to autonegotiate or did you set it to 100/FD explicitly?  It may be
>that some cards and some switches don't negotiate correctly unless
>permitted to negotiate all the way.
>
>   rgb
>
>Robert G. Brown	                       http://www.phy.duke.edu/~rgb/
>Duke University Dept. of Physics, Box 90305
>Durham, N.C. 27708-0305
>Phone: 1-919-660-2567  Fax: 919-660-2525     email:rgb@phy.duke.edu
>
>
>
>
>
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             Terry Rolon   
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           Foundry Networks  
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