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

[Or Gerlitz]

Steve Wise wrote:
> Seems like the retry functionality is perhaps useful enough then to 
> add it into the rdma-cm itself?  IE have a retry count param to 
> rdma_resolve_route() maybe? Just thinking aloud...
Steve, Sean

As I just wrote, with IB,  there's a lower level mechanism (mad) to 
enforce timeout and implement retries for route lookup. Since with iWARP 
route resolution is no-op, its seems we are done in that respect.

As for address resolution, the kernel addr module implements a timeout 
mechanism.

I wonder if one of the neighbour subsystem sysctls/params, could be used 
to implement retries, looking on arp(7) I came a cross the retrans_time 
sysctl which stands for "The number of jiffies to delay before 
retransmitting a request. Defaults to 1 second", but I wasn't sure if it 
stands for itself or has to be used in conjunction with other sysctls. 
Basically, when an arp is a byproduct of the IP stack wanting to send a 
packet, there's a rich state-machine of retries, etc, I assume it 
should/could be usable for the RDMA stack.

Or.