[netperf-talk] Confusing result of the throughput in wireless network with different UDP packet length.

[Peng Wang]

---------- Forwarded message ----------
From: Peng Wang <wangpeng19834 at gmail.com>
Date: Thu, Feb 19, 2009 at 11:22 AM
Subject: Confusing result of the throughput in wireless network with
different UDP packet length.
To: "netperf-feedback at netperf.org" <netperf-feedback at netperf.org>


Hi!

I did a benchmark of throughput in wireless network with different UDP
packet size. The UDP packet size is from 2K bytes to 40k bytes. The MTU is
set to be 2348 bytes.

The benchmark platform I use contains two buffalo wireless g router. One
router is the sender, and one is the receiver. The operating system in them
is Linux with 2.4.7 version kernel.

The result of the benchmark confuses me. From the following figure we can
see that the throughput is highest when the UDP packet size is about 20k bytes
which is much bigger than the MTU. I guess it is because of the buffer in
the system, but I am not quite sure. Do you see it before? Could you explain
it?


regards,

Peng
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