[ewg] Changing min_rnr_timer and timeout attributes of QP

[Hal Rosenstock]

On 2/7/2013 1:29 AM, Hefty, Sean wrote:
>> I am trying to change min_rnr_timer and timeout attribute of QP from the Linux
>> kernel (RHEL6.3). The QP is created using rdma_create_qp() of rdma_cm moduleand
>> not ib_create_qp() as I want a generic code to work over IB as well as ROCEE.
> 
> These cannot be changed directly.  The min_rnr_timeout is set to 0, which is the maximum.  
> The timeout value is determined based on the packet lifetime reported by the SA.  You may be able to 
> configure the SM to set a higher/lower packet lifetime.

If you are using OpenSM, packet lifetime comes from the subnet timeout
as long as advanced QoS is not configured so in that case, you can set
the subnet_timeout option. Default is 0x12 which is 4.096usec * 2^18 ~ 1
sec.

-- Hal

> - Sean
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