Fabric OS FCIP Administrator’s Guide 77
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WAN performance analysis tools
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2. Configure the sender test endpoint using a similar CP CLI.
The syntax for invoking the sender test endpoint using
--ipperf for slot8, port ge0 on an
FR4-18i is as follows:
portcmd --ipperf 8/ge0 -s 192.168.255.100 -d 192.168.255.10 –S
The following example shows the results of the performance analysis for slot 8, port ge0:
ipperf to 192.41.70.43 from IP interface 192.41.70.42 on 0/1:3227
Sampling frequency(30s) Total time(30s) BW:112.73MBps WBW:55.57MBps Loss(%):0.00
Delay(ms):23 PMTU:1500
Sampling frequency(30s) Total time(60s) BW:112.77MBps WBW:83.61MBps Loss(%):0.00
Delay(ms):23 PMTU:1500
Sampling frequency(30s) Total time(90s) BW:112.43MBps WBW:97.46MBps Loss(%):0.00
Delay(ms):22 PMTU:1500
Sampling frequency(30s) Total time(120s) BW:112.32MBps WBW:104.33MBps
Loss(%):0.00 Delay(ms):22 PMTU:1500
Sampling frequency(30s) Total time(150s) BW:112.15MBps WBW:107.69MBps
Loss(%):0.00 Delay(ms):23 PMTU:1500
Sampling frequency(30s) Total time(180s) BW:112.54MBps WBW:109.55MBps
Loss(%):0.00 Delay(ms):23 PMTU:1500
Where:
Sampling frequency(s)
The interval specified with the portCmd
--ipperf command with the -i option
or the default, 30 seconds.
Total Time The current running test total time (in seconds) for the last
--ipperf command
issued.
BW The bandwidth measured in the last interval. Bandwidth is defined as the
total packets and bytes sent. BW represents what the FCIP tunnel / FC
application sees for throughput rather than the Ethernet on-the-wire bytes.
WBW The weighted bandwidth currently with a gain of 50 percent.
Loss(%) The number of TCP retransmits. This number is an average rate over the last
display interval.
Delay(ms) The TCP smoothed round-trip time (RTT) and variance estimate in
milliseconds.
PMTU The path MTU. This is the largest IP-layer datagram that can be transmitted
over the end-to-end path without fragmentation. This value is measured in
bytes and includes the IP header and payload. Note: There is limited support
for black hole PMTU detection. If the Jumbo PMTU (anything over 1500) does
not work,
--ipperf tries 1500 bytes. If 1500 PMTU fails, --ipperf tries the
lower PMTU of 1260 (the minimum PMTU supported for FCIP tunnels). If
1260 also fails,
--ipperf gives up. There is no support for aging. During black
hole PMTU detection the BW, WBW, Loss and PMTU values printed may not
be accurate.