[openib-general] [PATCH 0/4] SA path record caching

[Sean Hefty]

Or Gerlitz wrote:
> I recall that SilverStorm mentioned they had a well working SA replica, 
> but when i look on the naked math for 1k nodes and the hard to reach in 
> real life uniform distribution of queries over time, i really can't see 
> how to reach it unless you practically never update the cache and you 
> have magically caused your SM/SA to survive the one and only session of 
> those 1k get table queries (again 350 mad/sec, so many concurrent rmpp 
> sessions etc etc).

Whether the cache is there or not, the SA is going to see at least this many 
queries in order to establish all-to-all connections.  This doesn't seem any 
worse to me than what a DNS server might see under the same conditions.

> I guess feedback from MPI people telling whether they have plans to use 
> path query would help us to see where we actually stand.

Hal and I will be meeting with them in Sonoma to make sure that we have their 
requirements down.  But they have asked that each node have all path records as 
input into their routing algorithms.

- Sean