Hi Éric,
Interesting problem. IMO you are right, it is an issue with Windows TCP/IP
stack. I suggest you post a message in a Microsoft Windows Server TechNet
newsgroup
(http://social.technet.microsoft.com/Forums/en-US/category/windowsserver).
--
francois.pie...@overbyte.be
The author of the freeware multi-tier middleware MidWare
The author of the freeware Internet Component Suite (ICS)
http://www.overbyte.be
----- Original Message -----
From: "Éric Fleming Bonilha" <e...@digifort.com.br>
To: "ICS support mailing" <twsocket@elists.org>
Sent: Monday, February 28, 2011 11:28 PM
Subject: [twsocket] Strange UDP behaviour
Hi
I don´t know if this message is OT, maybe slight OT, but I´m facing an
interesting problem with UDP datagrams and Windows 7/2008 stack
Well, we have a scenario where a machine can´t receive over 30 mbits of
UDP data on a local gigabit ethernet, and to make it worse, the whole
windows TCP/IP stack becomes unstable, and I mean that because if we use
ping 127.0.0.1 –t we see strange delays as 30ms, even 800ms!
After a lot of researching on the problem, we found that some video
equipments that we are receiving video (RTP over UDP), sends each packet
of video from a different source port! The source port is always
incremented for each packet the equipment sends, and there are about 50
equipments sending about 170 packets per second each equipment, giving a
total of 2mbits of data per second per equipment.
I made a little program to test such behaviour, I opened a server on a
machine, listening on 50 UDP ports and a client on 4 different machines
sending datagrams to this server. if I send the UDP packets all from the
same source port (Same “connection”) I can receive over 200mbits of data
easily, but if I change the client to send 1 packet per source port (By
calling Close and Connect each time I send a new UDP packet) then, the
server will not be able to receive more than 30mbits and ping 127.0.0.1 –t
from the server will start delaying to 5~10ms.
I believe that this is something related to windows 7/2008 IP stack
implementation, does anybody have an idea on why does this happens? Maybe
the overhead of managing packets from different source ports is too high!
Oh, I´m using TWSocket to receive UDP data
Thanks!
Éric
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