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1. IB/TCP/GNI re-send timeout
2. LND transmit timeout
   1. The timeout to wait for before a transmit fails and lnet_finalize() is called with an appropriate error code. This will result in a resend.
3. Transaction timeout
   1. timeout after which LNet sends a timeout event for a missing REPLY/ACK.
4. Message timeout
   1. timeout after which LNet abandons resending a message.
5. Resend interval
   
   1. The interval between each (re)send procedure.
6. RPC timeout
   1. The INITIAL_CONNECT_TIMEOUT is set to 5 sec
   2. ldlm_timeout and obd_timeout are tunables and default to LDLM_TIMEOUT_DEFAULT and OBD_TIMEOUT_DEFAULT.
7. transaction timeout
   1. A PUT or a GET can be sent successfully. LNet needs to wait on the ACK/REPLY respectively.
   2. The transaction timeout defines the amount of time to wait before sending a timeout event upwards.
   3. this value is user specified and defaults to the peer_timeout default (180s)
   4. This value can be overridden by the caller of LNetGet()/LNetPut()
8. Message timeout
   1. timeout after which LNet abandons resending a message.
9. Resend interval
   
   1. The interval between each (re)send procedure.
10. RPC timeout
    1. ptlrpc level timeouts.
    2. The INITIAL_CONNECT_TIMEOUT is set to 5 sec
    3. ldlm_timeout and obd_timeout are tunables and default to LDLM_TIMEOUT_DEFAULT and OBD_TIMEOUT_DEFAULT.

IB/TCP/GNI re-send timeout < LND transmit timeout  < LNet message timeout < LNet transaction timeout < RPC timeout.

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