Question on mlx4 log_num_mtt and log_mtt_per_seg setting

[Bharath Ramesh <bramesh-PjAqaU27lzQ@public.gmane.org>]

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I am trying to find the correct setting for log_num_mtt and 
log_mtt_per_seg should be for our cluster. Each node has 64G of RAM. We 
are having issues when running MPI applications, the error is related to 
registering memory. The current setting log_num_mtt=24 and 
log_mtt_per_seg=1. There are lot of conflicting documentations available 
with regards how these settings should be changed. I was wondering if 
the community could explain how these settings works so that we can come 
up with the correct settings that will work in our environment. This 
document [1] specifically says that log_mtt_per_seg should always be 1. 
However, OpenMPI mailing list post [2] talks about different value. Any 
help on this is appreciated. I am not subscribed to the list so would 
really appreciate if I am copied in the replies.

[1] http://www.open-mpi.org/faq/?category=openfabrics#ib-low-reg-mem
[2] http://www.open-mpi.org/community/lists/users/2011/09/17222.php

-- 
Bharath



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