> 
> * btl_openib_ib_retry_count - The number of times the sender will
>   attempt to retry (defaulted to 7, the maximum value).
> * btl_openib_ib_timeout - The local ACK timeout parameter (defaulted
>   to 10).  The actual timeout value used is calculated as:
> 

Actually I'm surprised that default value is 10. I think it used to be 20. 
Anyway I would recommend to bump it up.

Pasha


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