[openib-general] [PATCH] IB_CM: Limit the MRA timeout

[Sean Hefty]

Michael S. Tsirkin wrote:
> For remote cm timeout and service timeout this makes sense - they seem
> currently mostly taken out of the blue on implementations I've seen.
> 
> But since the packet lifetime comes from the SM, it actually has a chance
> to reflect some knowledge about the network topology.
> And since we haven't see any practical issues with packet life time yet -
> maybe a different paremeter for that, with a higher limit?

I guess the question is how much do we trust the timeout values sent in a CM 
MAD.  (It's hard for me to imagine a network that requires a 2.5 hour packet 
life time.  IB to space?)  Having separate timeout values may make sense, but my 
expectation is for the remote cm timeout and service timeout values to be 
greater than the packet life time.

If we go with separate values, then is there a reason not to have separate 
defaults for each one?  My preference is to try to limit the number of values.

- Sean