IBM TS7600 with ProtecTIER Software Upgrade Manual page 92

v The Mbits/sec reported in this test is the maximum throughput your system
Test 6: TCP Retransmissions vs. Total TCP segments sent
Example result:
Interpreting the results:
v A total of 1619061 TCP segments were sent during the five tests, out of which,
v The retransmission rate imposes a direct penalty on the throughput, as the
v Segment loss can be caused by each of the network layers.
v TCP retransmission larger than 2% may cause performance degradation and
What to do next
You may want to run these tests again to test the reverse throughput in the
network. To run the tests in reverse, change server1 to the client and server2 to the
server and repeat the procedures.
78
IBM System Storage TS7600 with ProtecTIER: Software Upgrade Guide
may achieve. If this number is lower than anticipated, contact your network
administrator.
Number of TCP segments sent: 1619061
Number of TCP retransmissions detected: 201038 (12%)
201038 were lost and retransmitted.
retransmission of these packets take up bandwidth. The retransmission can be
caused by the underlying network (e.g. packet dropping by an overflowed
router) or by the TCP layer itself (e.g. retransmission due to packet reordering).
unstable network connectivity. Contact your network administrator to resolve
this issue and reduce it to approximately 0%.