PGM and SPM

[Gert Leunen]

Is there a way to adjust the rate at which SPM packets are send when using a
PGM socket ? If I could adjust this setting I have control on how fast the
protocol detects a packet send failure.

[Jialiang Ge [MSFT]]

Hello

How do you send SPM packet through PGM socket? Could you please share some
code samples?
http://msdn.microsoft.com/en-us/library/dd646625(PROT.10).aspx
http://msdn.microsoft.com/en-us/library/ms740147(VS.85).aspx

I'm not sure whether SPMInterval mentioned in the first article could help
in this case.

Regards,
Jialiang Ge
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[Gert Leunen]

When you send data using a PGM socket the SPM packets are created
implicitely by the protocol for its own purposes of building a node tree.

I want to use PGM to reliably multicast data to other nodes. But PGM only
relies on negative acks send when one of the receiving nodes detects it has
missed some packets. But what about the final packet of a stream ? A
receiving node can never know it missed it. Since no more packets are being
send so it can't detect a gab in the received sequence numbers. According to
what I have read, the periodically send SPM packets have also sequence
numbers. So, eventually the receiver will detect a missed packet. But the
upper bound on the detection time is defined by the rate at which these SPM
packets are send. Now, my question is if I instruct the PGM protocol to
adjust this rate ?

kind regards,
Mario

""Jialiang Ge [MSFT]"" <jia...@online.microsoft.com> wrote in message
news:OiGoIc3j...@TK2MSFTNGHUB02.phx.gbl...

[Jialiang Ge [MSFT]]

Hello

I'm still performing researches on this question. I will update you as soon
as I have any findings.

[Jialiang Ge [MSFT]]

Hello

After many hours' research, I don't find such a socket option. The minimum
SPM heartbeat timeout is 1 second and grows up to maximum of 15 seconds.