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2–Planning
Performance Tuning
2-4 ISR651101-00 J
Latency
Latency is a measure of how fast a transaction travels through the router and LAN
or WAN.
Performance Tuning
Proper configuration maximizes the router’s performance. Knowing the round-trip
delay (distance between the router and iSCSI initiators) and WAN effective data
rate (connection type) allows you to tune the router for optimal performance. The
following tables provide TCP Window Size settings for specific WAN
environments. The TCP Window Size is configured as two parameters: Window
Size and Scaling Factor. See the iSR6200 Router Manager User’s Guide and the
iSR6200 Command Line Interface (CLI) User’s Guide for configuring the TCP
window size.
Table 2-1. T1—1.554Mbps
Round-Trip Delay (ms) TCP Window Size (kBytes)
≤ 41.5 8
≤ 82.9 16
≤ 165.8 32
≤ 331.6 64
≤ 663.2 128
≤ 1326.5 256
≤ 2652.9 512