实验环境：
vmware workstation 11
centos6.7的系统下
server端：192.168.239.140 防火墙关闭 setenforce 0
client端：192.168.239.138 防火墙关闭 setenforce 0
SecureCRT （ssh远程连接软件）
软件介绍：
qperf measures bandwidth and latency between two nodes. It can work over TCP/IP as well as
the RDMA transports. On one of the nodes,qperf is typically run with no arguments desig-
nating it the server node. One may then run qperf on a client node to obtain measurements
such as bandwidth,latency and cpu utilization.
In its most basic form,qperf is run on one node in server mode by invoking it with no argu-
ments. On the other node,it is run with two arguments: the name of the server node fol-
lowed by the name of the test. A list of tests can be found in the section,TESTS. A vari-
ety of options may also be specified.
软件的使用：
我们可以直接man一下qperf
NAME
qperf - Measure RDMA and IP performance
SYNOPSIS
qperf
qperf SERVERNODE [OPTIONS] TESTS
EXAMPLES 例子
To run a TCP bandwidth and latency test:
qperf myserver tcp_bw tcp_lat
To run a SDP bandwidth test for 10 seconds:
qperf myserver -t 10 sdp_bw
To run a UDP latency test and then cause the server to terminate:
qperf myserver udp_lat quit
To measure the RDMA UD latency and bandwidth:
qperf myserver ud_lat ud_bw
To measure RDMA UC bi-directional bandwidth:
qperf myserver rc_bi_bw
To get a range of TCP latencies with a message size from 1 to 64K
qperf myserver -oo msg_size:1:64K:*2 -vu tcp_lat
当然简单的使用的话 还是比较容易上手的。
实验流程:
一、服务器端部署（记住防火墙先关闭）
1、qperf软件安装
[root@localhost ~]# yum install -y qperf
2、qperf软件启动
[root@localhost ~]# qperf
二、客户端部署（关闭防火墙）
1、qperf软件安装
[root@localhost ~]# yum install -y qperf
2、测量tcp的带宽和延时
[root@localhost ~]# qperf 192.168.239.140 tcp_bw tcp_lat
tcp_bw:
bw = 390 MB/sec
tcp_lat:
latency = 64.7 us
可以看到我的带宽是390MB 时延是64.7 us
3、测量tcp的带宽和延时、双方机器的配置
[root@localhost ~]# qperf 192.168.239.140 tcp_bw tcp_lat conf
tcp_bw:
bw = 389 MB/sec
tcp_lat:
latency = 61.7 us
conf:
loc_node = localhost.localdomain
loc_cpu = Intel Core i5-3230M @ 2.60GHz
loc_os = Linux 2.6.32-431.el6.x86_64
loc_qperf = 0.4.9
rem_node = localhost.localdomain
rem_cpu = Intel Core i5-3230M @ 2.60GHz
rem_os = Linux 2.6.32-431.el6.x86_64
rem_qperf = 0.4.9
4、我们可以透过改变消息的大小（msg_size），比如从1个字节到64K，每次倍增的方式，来观察带宽和延迟的变化情况
[root@localhost ~]# qperf 192.168.239.140 -oo msg_size:1:64K:*2 -vu tcp_lat
tcp_lat:
latency = 52 us
msg_size = 1 bytes
tcp_lat:
latency = 53.9 us
msg_size = 2 bytes
tcp_lat:
latency = 52.1 us
msg_size = 4 bytes
tcp_lat:
latency = 54.1 us
msg_size = 8 bytes
tcp_lat:
latency = 53.5 us
msg_size = 16 bytes
tcp_lat:
latency = 53.3 us
msg_size = 32 bytes
tcp_lat:
latency = 53.8 us
msg_size = 64 bytes
tcp_lat:
latency = 59.7 us
msg_size = 128 bytes
tcp_lat:
latency = 53.8 us
msg_size = 256 bytes
tcp_lat:
latency = 56.2 us
msg_size = 512 bytes
tcp_lat:
latency = 55.7 us
msg_size = 1 KiB (1,024)
tcp_lat:
latency = 88.9 us
msg_size = 2 KiB (2,048)
tcp_lat:
latency = 81.9 us
msg_size = 4 KiB (4,096)
tcp_lat:
latency = 102 us
msg_size = 8 KiB (8,192)
tcp_lat:
latency = 212 us
msg_size = 16 KiB (16,384)
tcp_lat:
latency = 278 us
msg_size = 32 KiB (32,768)
tcp_lat:
latency = 501 us
msg_size = 64 KiB (65,536)
我们可以清晰的看到随着消息的增大时延明显的增大 。
谢谢大家~~~~~~ 希望大家学有所得。
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