Linux 性能监控分析(11)

       然后在客户端对服务器进行测试，客户端先连接到服务器端（172.16.38.36），并在30秒内每隔5秒对服务器和客户端之间的网络进行一次带宽测试和采样：

# iperf -c 172.16.38.36 -t 30 -i 5

------------------------------------------------------------

Client connecting to 172.16.38.36, TCP port 5001

TCP window size: 16.0 KByte (default)

------------------------------------------------------------

[  3] local 172.16.39.100 port 49515 connected with 172.16.38.36 port 5001

[ ID] Interval       Transfer     Bandwidth

[  3]  0.0- 5.0 sec  58.8 MBytes  98.6 Mbits/sec

[ ID] Interval       Transfer     Bandwidth

[  3]  5.0-10.0 sec  55.0 MBytes  92.3 Mbits/sec

[ ID] Interval       Transfer     Bandwidth

[  3] 10.0-15.0 sec  55.1 MBytes  92.4 Mbits/sec

[ ID] Interval       Transfer     Bandwidth

[  3] 15.0-20.0 sec  55.9 MBytes  93.8 Mbits/sec

[ ID] Interval       Transfer     Bandwidth

[  3] 20.0-25.0 sec  55.4 MBytes  92.9 Mbits/sec

[ ID] Interval       Transfer     Bandwidth

[  3] 25.0-30.0 sec  55.3 MBytes  92.8 Mbits/sec

[ ID] Interval       Transfer     Bandwidth

[  3]  0.0-30.0 sec    335 MBytes  93.7 Mbits/sec

5.4  tcpdump 和 tcptrace

       tcmdump 和 tcptrace 提供了一种更细致的分析方法，先用 tcpdump 按要求捕获数据包把结果输出到某一文件，然后再用 tcptrace 分析其文件格式。这个工具组合可以提供一些难以用其他工具发现的信息：

# /usr/sbin/tcpdump -w network.dmp

tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes

511942 packets captured

511942 packets received by filter

0 packets dropped by kernel

# tcptrace network.dmp

1 arg remaining, starting with 'network.dmp'

Ostermann's tcptrace -- version 6.6.7 -- Thu Nov  4, 2004

511677 packets seen, 511487 TCP packets traced

elapsed wallclock time: 0:00:00.510291, 1002714 pkts/sec analyzed

trace file elapsed time: 0:02:35.836372

TCP connection info:

  1: zaber:54581 - boulder:111 (a2b)                   6>    5<  (complete)

  2: zaber:833 - boulder:32774 (c2d)                   6>    5<  (complete)

  3: zaber:pcanywherestat - 172.16.39.5:53086 (e2f)    2>    3<

  4: zaber:716 - boulder:2049 (g2h)                  347>  257<

  5: 172.16.39.100:58029 - zaber:12865 (i2j)           7>    5<  (complete)

  6: 172.16.39.100:47592 - zaber:36814 (k2l)        255380> 255378<  (reset)

  7: breakpoint:45510 - zaber:7012 (m2n)               9>    5<  (complete)

  8: zaber:35813 - boulder:111 (o2p)                   6>    5<  (complete)

  9: zaber:837 - boulder:32774 (q2r)                   6>    5<  (complete)

 10: breakpoint:45511 - zaber:7012 (s2t)               9>    5<  (complete)

 11: zaber:59362 - boulder:111 (u2v)                   6>    5<  (complete)

 12: zaber:841 - boulder:32774 (w2x)                   6>    5<  (complete)

 13: breakpoint:45512 - zaber:7012 (y2z)               9>    5<  (complete)