HP 2424M - Manual (Page 31)

HP ProCurve Switch 4000M / 8000M / 2424M / 1600M Reviewer’s Guide
6.1.3 Latency Test - broadcast traffic
In this SmartApplications test a 64 byte broadcast packet is sent into port 1 of the switch. The FIFO 18
time it takes for the packet to emerge from the different ports is then recorded. The important
measurement here is the variability between ports.
6.1.3.1 100Mbps
64 byte broadcast packet
Port Latency 16 9.5 µs 31 9.2 µs 46 10.1 µs 61 9.3 µs 76 9.5 µs
2 9.7 µs 17 9.7 µs 32 9.5 µs 47 9 µs 62 9.5 µs 77 9.8 µs
3 9.8 µs 18 9.8 µs 33 9.7 µs 48 9.1 µs 63 9.9 µs 78 9.9 µs
4 9.9 µs 19 9 µs 34 9.9 µs 49 9 µs 64 10.1 µs 79 9.5 µs
5 8.9 µs 20 9.2 µs 35 9 µs 50 9.1 µs 65 10 µs 80 9.6 µs
6 9.2 µs 21 9.4 µs 36 10 µs 51 10 µs 66 10.1 µs
7 9 µs 22 9.5 µs 37 9 µs 52 10.2 µs 67 9.9 µs
8 9.2 µs 23 9.6 µs 38 9.1 µs 53 9.3 µs 68 10.1 µs
9 9.4 µs 24 9.8 µs 39 9.4 µs 54 9.6 µs 69 10 µs
10 9.5 µs 25 9 µs 40 9.6 µs 55 9.8 µs 70 10.1 µs
11 9.6 µs 26 9.2 µs 41 9.7 µs 56 9.9 µs 71 10 µs
12 9.9 µs 27 9.4 µs 42 9.8 µs 57 10.1 µs 72 10.2 µs
13 9 µs 28 9.6 µs 43 9.7 µs 58 10.2 µs 73 10 µs
14 9.2 µs 29 9.8 µs 44 9.8 µs 59 8.9 µs 74 10.1 µs
15 9.5 µs 30 9.9 µs 45 10 µs 60 9.2 µs 75 9.4 µs
Mean: 9.60 (Calculated)
Average Deviation: 0.32 (Calculated)
6.1.3.2 10Mbps
64 byte broadcast packet
Port Latency 16 67.5 µs 31 66.7 µs 46 68.2 µs 61 66.6 µs 76 67.6 µs
2 65.8 µs 17 67.4 µs 32 66 µs 47 66.9 µs 62 66.3 µs 77 67.5 µs
3 66.1 µs 18 67.5 µs 33 66.1 µs 48 67.1 µs 63 66.8 µs 78 67.5 µs
4 66.4 µs 19 66.7 µs 34 66.3 µs 49 66.6 µs 64 66.8 µs 79 67.4 µs
5 65.3 µs 20 66.9 µs 35 66.7 µs 50 66.8 µs 65 66.8 µs 80 67.4 µs
6 66 µs 21 67 µs 36 66.7 µs 51 67.9 µs 66 66.5 µs
7 65.6 µs 22 67.3 µs 37 67 µs 52 68.2 µs 67 67.8 µs
8 65.9 µs 23 67.5 µs 38 66.8 µs 53 67.1 µs 68 67.7 µs
9 65.9 µs 24 67.5 µs 39 67.5 µs 54 67.2 µs 69 67.8 µs
10 66.5 µs 25 66.9 µs 40 66.3 µs 55 67.5 µs 70 68.1 µs
11 67.5 µs 26 67.4 µs 41 67.9 µs 56 68 µs 71 67.8 µs
12 66.4 µs 27 67.4 µs 42 67.6 µs 57 67.8 µs 72 68.3 µs
13 65.8 µs 28 67.5 µs 43 67.7 µs 58 68.1 µs 73 67.8 µs
14 67 µs 29 66.2 µs 44 67.8 µs 59 66.8 µs 74 67.8 µs
15 66.3 µs 30 66.7 µs 45 67.9 µs 60 66.8 µs 75 66.9 µs
Mean: 67.05 (Calculated)
Average Deviation: 0.60 (Calculated)
18 See the Latency discussion in section 3 of this guide for details on FIFO versus LIFO figures.
©1998, 1999, 2000 Hewlett-Packard Co Revision 3.2b – 1/15/2000 Page 31 of 36