OpenSAF uses TIPC socket type RDM but the above scenario (send failure) can
happen with any TIPC socket type including connection oriented socket STREAM or
SEQPACKET.
I think the problem is more likely to happen on OpenSAFs central services on
the controllers. Especially when there is cluster formation. The risk increases
with a large IMM database etc.
---
** [tickets:#641] MDS resend**
**Status:** unassigned
**Created:** Thu Nov 28, 2013 09:40 AM UTC by Hans Feldt
**Last Updated:** Thu Nov 28, 2013 09:40 AM UTC
**Owner:** nobody
Occasionally we see TIPC link congestion at the sending node. This can be seen
with "tipc-config -ls" as in:
Link <1.1.1:eth0-1.1.2:eth0>
ACTIVE MTU:1500 Priority:10 Tolerance:1500 ms Window:100 packets
RX packets:1877 fragments:0/0 bundles:0/0
TX packets:17511 fragments:0/0 bundles:0/0
TX profile sample:489 packets average:151 octets
0-64:0% -256:97% -1024:0% -4096:3% -16354:0% -32768:0% -66000:0%
RX states:12974 probes:5918 naks:0 defs:0 dups:0
TX states:12148 probes:6230 naks:0 acks:0 dups:0
Congestion bearer:0 link:12 Send queue max:81 avg:0
Above is from testing with tipc-pipe. With the default link window at 50 I get
one send EAGAIN when sending 100 msgs. When I increase link window to 100 I can
burst 100 msgs without link congestion. If I then burst 1000 msgs I see lots of
link congestion.
If we transfer this to opensaf it means a failed MDS send. MDS does not do any
resends, neither does any service (IMMs FEVS not considered)
AMFd for example could loose a message to a node director which is very bad.
What I suggest is that messages should be resent, typically a loop with 3
retries with a 100ms sleep in between.
There are some concerns, like:
* Can we put this in MDS or should it be done per service?
* What about MDS/TCP, same problem there?
---
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