[LARTC] ethernet card drops small packets severely and behaviour is not understandable

Linux Advanced Routing and Traffic Control

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Hi,

My name is kishore. I am a student at the University
of Texas at Dallas.

Problem Description:

I have developed 2 modules. I am running one module on
one machine(redhat linux 7.3. Intel 933 MHz pentium
III) each.

One module pumps packets into the network. Another
module takes packets and keeps a log of the packets.

I conducted this experiment. I have sent constant size
packets and I am counting the number of packets
received.

this is the statistics

500 35 bytes packets are sent. only 337 are received.
500 44 bytes packets are sent. only 329 are received.
500 54 bytes packets are sent. only 328 are received.
500 84 bytes packets are sent. only 314 are received.
500 134 bytes packets are sent. only 219 are received.
500 234 bytes packets are sent. only 304 are received.
500 334 bytes packets are sent. all 500 packets are
received.

As the size of packets is increased till 134 bytes,
the number of packets dropped is increasing and after
134 bytes as the packet size is 
increasing, the number of packets dropped is
decreasing and all packets are 
received afterwards(packet size above 300 bytes).

I studied about interrupt mechanism and related stuff.
I could not 
figure out this behaviour. 

Eagerly waiting for  your reply.

Thanking You,

Regards,
Kishore 


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