Spirent Communications - SmartBits Latency Test Results
Vendor Name: IntruGuard
Product Name: IG200-U
Software Version: SmartApplications V 3.00
Library Version: 3.51-1
Firmware Version: 1.07.009.0 - Active
Serial Number: 06001320
Latency test length: 100 seconds
Average of: 20 trials
Port pairs active: 1
Mode: Uni-directional
Date: Thu Jun 24 12:58:19 2010
Mode: SmartMetrics Comp. Mode
(Cut Through)Port-Pair Latency in microseconds (us) [or ms where noted]
========================================================================
Frame size 64 128 256 512 1024 1280
Percent load 100.00 100.00 100.00 100.00 100.00 100.00
-------------------------------------------------------------------------------
(01,01,01) to (01,02,01) 3.6 4.7 7.1 11.7 20.9 25.6
(Store and Forward)Port-Pair Latency in microseconds (us) [or ms where noted]
=============================================================================
Frame size 64 128 256 512 1024 1280
Percent load 100.00 100.00 100.00 100.00 100.00 100.00
-------------------------------------------------------------------------------
(01,01,01) to (01,02,01) 3.0 3.7 5.0 7.6 12.8 15.3
Spirent Communications - SmartBits Latency Test Results
========================================================================
Frame size 1518
Percent load 100.00
---------------------------------------
(01,01,01) to (01,02,01) 29.9
(Store and Forward)Port-Pair Latency in microseconds (us) [or ms where noted]
=============================================================================
Frame size 1518
Percent load 100.00
---------------------------------------
(01,01,01) to (01,02,01) 17.8
This test concludes that at frame sizes of 64, 128, 256, 512, 1024, 1280 bytes, with 100% interface traffic at 1 Gbps full duplex, the latency was 3.0, 3.7, 5.0, 7.6, 12.8, 15.3 microseconds. For frame size of 1518 bytes at 100% interface traffic, the latency was under 29.9 microseconds.
The objective of the latency test is to determine the latency of a frame traversing the DUT.
There is a significant amount of processing that a device must perform on each frame. This test helps to ensure that with the ever
increasing processing requirements, the time it takes a DUT to forward a frame is within acceptable
limits.
The latency is the amount of time it takes the DUT to start forwarding the frame (first bit of frame is
transmitted) after receiving it. Timestamp T1 is taken when the frame is received by the DUT and
timestamp T2 is taken when the first bit of the frame appears on the output port. The latency is simply
T2 — T1. For a store and forward device, T1 is taken when the last bit of the frame is received by the
DUT. For a bit forwarding device, T2 is taken when the first bit of the frame is received by the DUT.
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