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3-7
Cisco SFS InfiniBand Host Drivers User Guide for Linux
OL-12309-01
Chapter 3 IP over IB Protocol
IPoIB Performance
Step 5 Run the Netperf Latency test.
Run the test once, and stop the server so that it does not repeat the test.
The following example shows how to run the Latency test, and then stop the Netperf server:
host2$ netperf -H 192.168.0.1 -c -C -t TCP_RR -- -r 1,1
TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.1
(192.168.0.1) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans. CPU CPU S.dem S.dem
Send Recv Size Size Time Rate local remote local remote
bytes bytes bytes bytes secs. per sec % S % S us/Tr us/Tr
16384 87380 1 1 10.00 17228.96 12.98 12.30 30.146 28.552
16384 87380
The following list describes parameters for the netperf command:
The notable performance values in the example above are as follows:
Client CPU utilization is 12.98 percent of client CPU.
Server CPU utilization is 12.30 percent of server CPU.
Latency is 29.02 microseconds. Latency is calculated as follows:
(1 / Transaction rate per second) / 2 * 1,000,000 = one-way average latency in microseconds
Step 6 To end the test, shut down the Netperf server.
host1$ pkill netserver
-H Where to find the server
192.168.0.1 IPoIB IP address
-c Client CPU utilization
-C Server CPU utilization
-t Test type
TCP_RR TCP required response test
-- Separates the global and test-specific parameters
-r 1,1 The request size sent and how many bytes requested back