Connection Analysis

 

SQPO01: Packets not in order greater than 0

Packets are obviously not in order when packets are lost or late. In both cases the penalty to performance can be high. The application needing the packets is suspended until the data is in order and that means that lost data has to be recovered and late data must be in time so as to not cause a retransmit timeout. This event can trigger duplicate packets, retransmitted packets or both. If a timeout occurs TCP will invoke a slow start which affects all subsequent packets for a longer window of time, this is just TCP trying to avoid the problem reoccurring. All resent packets consume bandwidth and cause throughput to slow. If the data is duplicated because the packet was just late and did eventually arrive then all the lost throughput is just wasted for no gain in integrity.

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