Redundant acknowledgment in loopback entry

A method comprising:

• initiating loopback communications at a second agent;
• receiving a packet including a redundant acknowledgment sequence from the first agent at the second agent;
• looping the packet including the redundant acknowledgement sequence back to the first agent from the second agent;
• receiving a test sequence from the first agent at the second agent;
• looping the test sequence back to the first agent;
• determining whether the received redundant acknowledgment sequence is valid;
• and
• looping back the test sequence if the received redundant acknowledgment sequence is determined to be valid.

An article including a machine-readable medium comprising data stored thereon that when operated on by the machine cause the machine to perform operations comprising:

• initiating loopback communications from a first agent to a second agent;
• sending a packet including a redundant acknowledgment sequence from the first agent to the second agent;
• receiving the packet including the redundant acknowledgement sequence looped back from the second agent at the first agent;
• sending a test sequence from the first agent to the second agent;
• receiving the test sequence looped back from the first agent;
• determining whether the received redundant acknowledgment sequence is valid;
• and
• looping back the test sequence if the received redundant acknowledgment sequence is determined to be valid.

A multiple processor computing system comprising:

• a first processing agent;
• and
• a second processing agent;
• and
• a bidirectional communications bus connecting the first agent to the second agent,
• the first agent initiating loopback communications to the second agent, and sending a packet including a redundant acknowledgment sequence,
• the second agent sending a packet including the redundant acknowledgement sequence looped back to the first agent,
• the first agent sending a test sequence to the second agent, and
• the second agent sending the test sequence looped back from the first agent,
• wherein the first agent determines whether the received redundant acknowledgment sequence is valid, and loops back the test sequence if the received redundant acknowledgment sequence is valid.