[ofa-general] [PATCH] perftest Add rdma_cm retries

[Or Gerlitz]

David McMillen wrote:
>
> I am pleased to see the discussions this has raised about possible 
> changes to the underlying kernel services.   However, this user-mode 
> patch does address a real problem in the stack as it stands, and I'd 
> like to see agreement that it should be applied

Generally speaking, since you only changed a synthetic program, I don't 
have any  issue with your patch, except for maybe creating possible 
confusion among people that can use this code as reference for their 
apps, see more below

> I don't know enough about the kernel level code to make comments on 
> the best way to improve it, but I would like to make an observation 
> from the user level.  There is no way for the user level to have an 
> informed decision about the proper value for timeouts or retry counts ...
The scalability issue is in the air for couple of years now, somehow it 
came into of many people being sure the problem is SA scalability, where 
personally, I am not sure this is the case. Also, in the past have tried 
to set up time for low level technical talking on the matter in ofa 
meeting, but it was almost always washed a way or given very tiny time 
slot since more important issues such as why ofed is the greatest thing 
on earth and what was the content of its last version and what will be 
the content of its next version, etc, etc. So what happens is that from 
time to time this or that related issue comes to the list, we have a 
thread on that and things are left in the air. Recently Sean commented 
that he works on something 
http://lists.openfabrics.org/pipermail/ewg/2009-July/013618.html also at 
May we had a related thread "How to establish IB communcation more 
effectively?"  @ 
http://lists.openfabrics.org/pipermail/general/2009-May/thread.html#59574 
etc etc

Or.