Re: [tipc-discussion] Dropped messages in TIPC 1.5.12

[Randy M. <mac...@no...>]

Stephens, Allan wrote:
> Hi Felix:
>  
> The results in case 1) are to be expected since you are running your 
> client and servers on the same node.  What is happening is that the 
> messages to the server are still being rejected, but are not being 
> queued up on the client's receive queue because this would exceed the 
> 5000 message per node limit.  (That is, the same mechanism that prevents 
> the messages from reaching the servers also prevents them from returning 
> to the client.)

Does this design seem reasonable?

Shouldn't message replies indicating: "I'm full/busy" be sent at:

original importance + 1

// Randy


>  
> The results in case 2) probably make sense for the same reason.  What is 
> probably happening here is that messages are rejected by one of the 
> servers once it's queue reaches 2500, but before the other server's 
> queue has reached that limit; consequently, some rejected messsages make 
> it back to the client and are consumed, allowing things to continue 
> until the clients have sent 12000 messages.  However, once both servers 
> reach the 2500 message limit, the scenario becomes identical to that in 
> case 1) and no further rejected messages are received by the client.
>  
> Regards,
> Al
> 
> ------------------------------------------------------------------------
> *From:* tip...@li... 
> [mailto:tip...@li...] *On Behalf Of 
> *Nayman Felix-QA5535
> *Sent:* Wednesday, May 30, 2007 12:14 PM
> *To:* tip...@li...
> *Cc:* Horvath, Elmer
> *Subject:* [tipc-discussion] Dropped messages in TIPC 1.5.12
> 
> Since I didn't get a response to my previous post, I'll try to make this 
> post easier to read and answer.
>  
> I've noticed two things while running various congestion tests where a 
> server is not pulling messages off of its receive queue:
>  
> 1)When I reach the 5000 per node socket-based congestion limit after 
> doing the following:
> a)running one server/client pair and filling up that server's receive queue
> b) then start a second server and fills up its receive queue using the 
> same client 
> c)messages are no longer rejected back to the client once I reach the 
> 5000 message count, instead they appear to be just dropped. Is that 
> behavior expected?
>  
> 2)When I've got 2 servers running without pulling messages off of their 
> receive queue (regardless of whether or not they have the same TIPC 
> Name).  I see no rejections whatsoever after sending over 12000 
> messages.  The messages appear to just get dropped. Why?
>  
> I'm running TIPC 1.5.12 on a 2.6.9 linux kernel with connectionless 
> traffic on the same node with the domain set to closest first and the 
> destination droppable flag set to FALSE.  I'm running modified versions 
> of the hello world demo client and server programs for this testing.
>  
> Let me know if you need anymore information.
> Thanks in advance,
> Felix
>