netperf & transmit path performance

From: Kallol Biswas (kallol@bugula.fpk.hp.com)
Date: Wed May 31 2000 - 10:36:28 EST


Hi,
   I have run netperf on my driver for 82559 card.
The command:
 /opt/netperf/netperf -t TCP_STREAM -H 198.168.10.67 -l 300 -c -C -- -s 57344 -S 57344 -m 4096 -M 4096
is used for testing the transmit path.

Over a full dulpex 100Mbps connection:

TCP STREAM TEST to 198.168.10.67
Recv Send Send Utilization Service Demand
Socket Socket Message Elapsed Send Recv Send Recv
Size Size Size Time Throughput local remote local remote
bytes bytes bytes secs. 10^6bits/s % L % L us/KB us/KB

 57344 57344 4096 300.02 93.84 45.48 83.10 39.703 72.542

Over a half duplex 10Mbps connection:
TCP STREAM TEST to 198.168.10.67
Recv Send Send Utilization Service Demand
Socket Socket Message Elapsed Send Recv Send Recv
Size Size Size Time Throughput local remote local remote
bytes bytes bytes secs. 10^6bits/s % L % L us/KB us/KB

57344 57344 4096 300.07 6.96 3.52 2.16 41.461 101.728

I am a bit concerned about the throughput over half duplex 10Mbps connection.
Could some body tell how throughput can go low at 10Mbps?

Simon Andrew Boggi got similar result over a half duplex connection
with eepro100.

 With 21143 based card we get the throughput around
9.2 on 10Mbps. I do not know if there is any problem with 82559 in half duplex mode.

Thanks,
Kallol

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