[ofa-general] Default value of LocalAckTimeout for a new QP

[Amir Vadai]

For that I will need to access structures that are private to CMA.
I hoped there is a way to do it in SDP code only or preferably from the environment.
 
- Amir

________________________________

From: Davis, Arlin R [mailto:arlin.r.davis at intel.com]
Sent: Thu 21-May-09 7:16 PM
To: Hal Rosenstock; Amir Vadai
Cc: Nimrod Gindi; OpenIB
Subject: RE: [ofa-general] Default value of LocalAckTimeout for a new QP




>> Sean Hi,
>>
>> I need to know how is the LocalAckTimeout for a new QP is
>calculated (for an
>> SDP QP).
>
>It's a function of the packet life time on the path from source to
>destination and the local CA ack delay.
>
>> Is there a way to change it through a module parameter?
>> If not, what is the right way to change it?
>
>It depends on the SM being used. OpenSM has a way to change the path
>PLT returned/used.

You can actually modify the path record (rdma_cm_id.route->path_rec)
before the rdma_connect, after the RDMA_CM_EVENT_ROUTE_RESOLVED event,
and rdma_cm will pick up the change for the internal QP modify.

-arlin


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