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Thread: RDT specifications
RDT specifications
country flaguser name
United States		 2008-03-10 10:39:19 

  


  

    

RDT v1 was deprecated a while back and completely replaced by v2&v3.
There should be no servers in the market today using v1.


If you are seeing some kind of rate adaptation mechanism as you mention,
then the client/server is using v3 (which was when rate adaptation was
introduced).


I have cc'ed the mailing list where you can ask further
questions.


Cheers,


Rishi.


At 11:37 PM 3/9/2008, vlemaire.extorange-ftgroup.com wrote:



Hello,



I'm currently analysing my network performances on streaming

applications over RDT/UDP. I observe a strange behaviour : sometimes the
throughput slows down, sometimes not. I really guess the data rate
reduction is due to RDT layer, probably because of bad performances of my
network, to investigate what causes this RDT reaction, I need the RDT
specification, but only RDT v2 and v3 features' description are available

on your web site. Do you know where and how could I get the RDT spec
V1.



Thanks 


Best regards 


Vincent 






Rishi Mathew

Helix Community

Real
Networks, Inc. 

rmathewreal.com 



http://www.helixcommunity.org



http://www.realnetworks.com/products/support/devsupport.html



  

  
  
   
     
    

  

     RDT specifications
  


  

     user name

     2008-03-10 11:04:54
  


  

    

  


  

    Hi,

 



I contact you because I don't find any clear 
documentation about ;the rate adaptation mechanism I observe on my 
network.


Here is a short description of my 
problem.


I'm analysing my network performances on streaming 
applications over RDT/UDP. The public backbone as no throughput 
restriction, my private network is limited to 32kb/s in uplink and downlink. I'm 
trying to watch a video encoded with 
100kb/s using streaming RDT/UDP. I repeat 10 times the same 
scenario in the same conditions, 8 times out of 10 attemps I observe the 
behaviour "A" and 75% of the packets lost, and the 2 attemps 
left I observe the behaviour "B" and 65% lost.




- behaviour "A" : the throughput on the backbone side 
stays at 150kb/s during all the transfer, the client reports 
ACK ;every second and NACK for each message 
missing.


- behaviour "B" : the throughput is 
150kb/s, the client reports ACK every second and NACK for each missing 
message (like for "A") but only during the first 15 seconds of the transfer, 
then the client stops sending both ACK and NACK and the data rate on the 
backbone side slows down to 100kb/s until the end of the transfer (why 
?!).



 



Do you have any idea of what happens or any suggestion 
of documentation I could read to investigate the cause of 
this.


 



Thanks for your help


 



Regards


Vincent


 



 






De : Rishi Mathew [mailto:rmathewreal.com] 

Envoyé : lundi 10 mars 2008 16:39
À : zze-EQOS 
LEMAIRE V ext RD-RESA-ISS
Cc : 
protocol-devhelixcommunity.org
Objet : Re: [hxadmin] RDT 
specifications




Hi Vincent,

RDT v1 was deprecated a while back and completely 
replaced by v2&v3. There should be no servers in the market today using 
v1.

If you are seeing some kind of rate adaptation mechanism as you 
mention, then the client/server is using v3 (which was when rate adaptation was 
introduced).

I have cc'ed the mailing list where you can ask further 
questions.

Cheers,
Rishi.

At 11:37 PM 3/9/2008, 
vlemaire.extorange-ftgroup.com wrote:



Hello, 
  

I'm currently analysing my network performances on 
  streaming applications over RDT/UDP. I observe a strange behaviour : sometimes 
  the throughput slows down, sometimes not. I really guess the data rate 
  reduction is due to RDT layer, probably because of bad performances of my 
  network, to investigate what causes this RDT reaction, I need the RDT 
  specification, but only RDT v2 and v3 features' description are available on 
  your web site. Do you know where and how could I get the RDT spec 
  V1.

Thanks 

Best 
  regards 

Vincent 



Rishi Mathew
Helix 
Community
Real 
Networks, Inc. 
rmathewreal.com 
http://www.helixcommunity.org
http://www.realnetworks.com/products/support/devsupport.html

  

  
  
   
     
    






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