Slow UDP loop time

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1 total messages Started by Jim Deas jim deas jadsystems. Thu, 28 Dec 2006 04:34

#1545

Author: Jim Deas jim deas jadsystems.
Date: Thu, 28 Dec 2006 04:34

32 lines
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Hi all,

I am using the basic TIdUDPClient and TIdUDPServer (reader on same thread as
listner) to communicate with 100+ slow embedded devices. I have been
monitoring the cpu usage and loop times for the messages to move between the
embedded devices and the cpu and found a problem I can't explain.

Using Packetyzer to monitor my message streams I was receiving good loop
response between the cpu and network devices. At my maximum speed the CPU
was under 4% load and I had no delays in sending messages. After completing
this work I removed Packetyzer and got a shock! Now my cpu useage is over
30% and I am noticing a large decrease in message response!

*Using Ethereal*

Each message is a single packet and a simple 64 byte ack is return from the
embedded device. In all cases this has a loop time of 6ms If Packetyzer is
running I can send the another message every 8ms. If I unload Packetyzer I
can only send every 40ms!



Does anyone know why the 5x speed penalty and high cpu usage? It is
repeatable across several systems. Ethereal does not seem to make a
difference when running even though uses the same ties as Packetyzer on its
lower levels. Packetyzer does not even have to be attached to the same
ethernet port to make a hugh difference in loop response. Is there a basic
socket or blocking issue in win2000 that could cause this?

Thanks,

J Deas

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