[Spread-users] high delay of messages

[Yuval Lifshitz]

I experienced a similar problem. We are also using spread on a LAN, with 4 machines sending 500 messages of ~200 bytes a second (~= 3Mbps total), 
and once every few seconds the "SP_multicast" call was blocked for about a second.
We haven't solved that :-( , we just use a buffer to make the Spread sending a-sync, so our main application won't stuck.

Yuval.

On Wednesday, 1 בFebruary 2006 05:32, Cristina Nita-Rotaru wrote:
> 
> We use Spread in a local area network for an
> application that is relatively bandwidth intensive
> in a many-to-many setting. However we noticed
> a huge delay in delivery of the packets (up
> to 94 seconds sometimes). We are sending about
> 20-30 Mbits/sec. All communication is FIFO. Platform
> is Windows, configuration is IP Multicast. In general
> the servers recover after a while and packets are
> delivered within acceptable delays, then again some
> big delay is noticeable.
> 
> Did anybody else experience this issue?
> We suspect that this may be related with the
> way Spread implements flow control.
> 
> We have several questions:
> 
> 1) What is the difference between the
> Window and Personal_Window variables
> used in the flow control protocol in
> flow_control.c.
> 
> 2) How were their values chosen (Window
> is 60 and Personal_Window is 15).
> 
> 
> thank you for your help,
> -- Cristina
> 
> 
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