利用 iperf 測試網路效能

利用 iPerf 測試網路效能

測試網路速度是否為理想狀況時,一般利網路芳鄰、FTP傳軟來達成測試的目地,但如果需要重覆測試時,這樣的測法可能比較沒有效率了,所以iperf這樣的工具對於測試網路傳輸的速度來說就較方便。iPerf3已釋出,此篇文章前半段維持iPerf2內容,增加後半段補充iPerf3的測試紀錄,iPerf2/3這兩個版本並不相容,但都能測試出網路效能,依照你的軟體環境及測試環境選擇版本,客戶端與伺服端的版本必需要相同

下載安裝

官網中有各種版本提供使用,選擇好你要使用的環境下載並解壓就能使用。

示範中使用Windows環境測試,所以下載Iperf 2.0.5-2,接下來就開始看下去該怎麼使用。

iperf命令說明

Usage: iperf [-s|-c host] [options]
       iperf [-h|--help] [-v|--version]

Client/Server:
  -f, --format    [kmKM]   format to report: Kbits, Mbits, KBytes, MBytes
  -i, --interval  #        seconds between periodic bandwidth reports
  -l, --len       #[KM]    length of buffer to read or write (default 8 KB)
  -m, --print_mss          print TCP maximum segment size (MTU - TCP/IP header)
  -o, --output    <filename> output the report or error message to this specified file
  -p, --port      #        server port to listen on/connect to
  -u, --udp                use UDP rather than TCP
  -w, --window    #[KM]    TCP window size (socket buffer size)
  -B, --bind      <host>   bind to <host>, an interface or multicast address
  -C, --compatibility      for use with older versions does not sent extra msgs
  -M, --mss       #        set TCP maximum segment size (MTU - 40 bytes)
  -N, --nodelay            set TCP no delay, disabling Nagle's Algorithm
  -V, --IPv6Version        Set the domain to IPv6

Server specific:
  -s, --server             run in server mode
  -U, --single_udp         run in single threaded UDP mode
  -D, --daemon             run the server as a daemon

Client specific:
  -b, --bandwidth #[KM]    for UDP, bandwidth to send at in bits/sec
                           (default 1 Mbit/sec, implies -u)
  -c, --client    <host>   run in client mode, connecting to <host>
  -d, --dualtest           Do a bidirectional test simultaneously
  -n, --num       #[KM]    number of bytes to transmit (instead of -t)
  -r, --tradeoff           Do a bidirectional test individually
  -t, --time      #        time in seconds to transmit for (default 10 secs)
  -F, --fileinput <name>   input the data to be transmitted from a file
  -I, --stdin              input the data to be transmitted from stdin
  -L, --listenport #       port to receive bidirectional tests back on
  -P, --parallel  #        number of parallel client threads to run
  -T, --ttl       #        time-to-live, for multicast (default 1)
  -Z, --linux-congestion <algo>  set TCP congestion control algorithm (Linux only)

Miscellaneous:
  -x, --reportexclude [CDMSV]   exclude C(connection) D(data) M(multicast) S(settings) V(server) reports
  -y, --reportstyle C      report as a Comma-Separated Values
  -h, --help               print this message and quit
  -v, --version            print version information and quit

[KM] Indicates options that support a K or M suffix for kilo- or mega-

The TCP window size option can be set by the environment variable
TCP_WINDOW_SIZE. Most other options can be set by an environment variable
IPERF_<long option name>, such as IPERF_BANDWIDTH.

將上面的整理一下,將Server、Client共通歸類一起做說明,其他的再分開解釋。

參數說明

-s 啟動server模式,例如:iperf -s
-c 啟動client模式,命令後接server的位址,例如:iperf -c 192.168.1.3

通用參數

-f [k|m|K|M] 報告結果顯示的單位,以Kbits, Mbits, KBytes, MBytes,例如:iperf -c 192.168.1.3 -f K
-i sec 報告顯示的時間間隔(以秒為單位),例如:iperf -c 192.168.1.3 -i 2
-l [KM] 緩衝區大小,預設是8KB,例如:iperf -c 192.168.1.3 -l 16
-m 顯示MTU最大值
-o 將報告與錯誤信息輸出到檔案,例如:iperf -c 192.168.1.3 -o c:\iperf-log.txt
-p server使用的連接埠或client使用的連接埠,兩端連接埠要一致,例如:iperf -s -p 9999
-u 使用udp通訊規格
-w 指定TCP框架大小,預設是8KB
-B 綁定一個主機地址,可以是介面或是廣播位址,當主機端同時有很多位址時才需要綁定
-C 相容舊版本(兩端版本不致時使用)
-M 設定TCP封包的最大MTU值
-N 設定TCP不延時
-V 傳輸ipv6資料封包


server專用

-D 背景服務方式運行,例如:iperf -s -D
-U 使用單一執行緒使用UDp模式


client專用

-b UDP測試專用,可以設定每秒傳送的速度
-d 同時進行雙向傳輸測試
-n 指定傳輸的大小,例如: iperf -c 192.168.1.3 -n 100000
-r 單獨進行雙向傳輸測試
-t 測試時間長度,預設10秒,例如: iperf -c 192.168.1.3 -t 5
-F 使用指定檔案來傳輸
-I 使用stdin方式當做傳輸內容
-T 指定ttl值


開始測試

使用iperf需要要有2台電腦,一台為serve端,另一台為client端,測試環境使用windows環境與Giga網路來當做示範,分為Server與Client。

Server(伺服端):

Server端的命令預設非常的簡單,只要執行

iperf –s

如下圖就開始運作。

Client(客戶端):

Client端設定比較多,主要是看你要選擇怎麼樣的測試方式,示範中使用下面的命令:

iperf –c 192.168.3.58 –w 100M –t 120 –i 10

解釋一下:

-c 192.168.3.58 :Server端的IP

-w 100M :測試的檔案大小

-t  120:監視測量數據時間為120秒

-i  10:每隔10秒將數據顯示出來

$

測試結果

依照所執行的命令需要測約120秒左右時間,看到下圖結果報告顯示總共測試從0.0~121.3秒,傳輸9.28GByte,

平均速度(Bandwidth)約在657Mbits/sec之間,對於Giga環境已經發揮6成的速度,這在Giga環境下測試的值並不是理想值,測試時必需要關閉一些網路軟體或是內建的QoS機制才有可能發揮到極速,所以速度並沒有我第一次在測試時平均可以跑到800Mbits/sec。

iPerf3

iPerf約莫許久後終於發行3.0版本,通稱為iPerf3,其舊的2.0版本稱iPerf2,如你要使用iPerf3新版本測試網路效能時,客戶端與伺服器端版本必需要都是iPerf3才能完成測試,這點官網有提到iPerf3 is not backwards compatible with iPerf2.,其他參數可以依照前半段文章不需要做變更就能繼續測試。

下載iPerf3

iPerf目前支援更多平台,前往官網下載頁面下載,後面測試的版本使用iPerf 3.1.3

iPerf3 開始測試

下面舉出使用iPerf3進行客戶端與伺服器配測試的紀錄檔供參考。

客戶端

客戶端使用Windows,而伺服器端使用Arch Linux

D:\iperf-3.1.3-win64>iperf3 -c 192.168.16.200 -w 100M -t 120 -i 10
Connecting to host 192.168.16.200, port 5201
[  4] local 192.168.16.223 port 58573 connected to 192.168.16.200 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  1.20 GBytes  1.03 Gbits/sec
[  4]  10.00-20.00  sec  1.10 GBytes   947 Mbits/sec
[  4]  20.00-30.00  sec  1.10 GBytes   947 Mbits/sec
[  4]  30.00-40.00  sec  1.10 GBytes   947 Mbits/sec
[  4]  40.00-50.00  sec  1.10 GBytes   948 Mbits/sec
[  4]  50.00-60.00  sec  1.10 GBytes   948 Mbits/sec
[  4]  60.00-70.00  sec  1.10 GBytes   945 Mbits/sec
[  4]  70.00-80.00  sec  1.10 GBytes   946 Mbits/sec
[  4]  80.00-90.00  sec  1.10 GBytes   947 Mbits/sec
[  4]  90.00-100.00 sec  1.10 GBytes   947 Mbits/sec
[  4] 100.00-110.00 sec  1.10 GBytes   947 Mbits/sec
[  4] 110.00-120.00 sec  1.10 GBytes   947 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-120.00 sec  13.3 GBytes   954 Mbits/sec                  sender
[  4]   0.00-120.00 sec  13.2 GBytes   947 Mbits/sec                  receiver

iperf Done.

伺服器端

因剛好沒有2台Windows供測試,伺服器端使用Arch Linux

[danny@lab-p5e-vm ~]$ iperf3 -s
--------------------------------------------------[danny@lab-p5e-vm ~]---------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.16.223, port 58572
[  5] local 192.168.16.200 port 5201 connected to 192.168.16.223 port 58573
[ ID] Interval           Transfer     Bandwidth
[  5]   0.00-1.00   sec   108 MBytes   903 Mbits/sec                  
[  5]   1.00-2.00   sec   113 MBytes   948 Mbits/sec                  
[  5]   2.00-3.00   sec   113 MBytes   948 Mbits/sec                  
[  5]   3.00-4.00   sec   113 MBytes   948 Mbits/sec                  
[  5]   4.00-5.00   sec   113 MBytes   947 Mbits/sec                  
[  5]   5.00-6.00   sec   113 MBytes   948 Mbits/sec                  
[  5]   6.00-7.00   sec   113 MBytes   949 Mbits/sec                  
[  5]   7.00-8.00   sec   113 MBytes   945 Mbits/sec                  
[  5]   8.00-9.00   sec   113 MBytes   944 Mbits/sec                  
[  5]   9.00-10.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  10.00-11.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  11.00-12.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  12.00-13.00  sec   113 MBytes   946 Mbits/sec                  
[  5]  13.00-14.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  14.00-15.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  15.00-16.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  16.00-17.00  sec   112 MBytes   941 Mbits/sec                  
[  5]  17.00-18.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  18.00-19.00  sec   113 MBytes   944 Mbits/sec                  
[  5]  19.00-20.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  20.00-21.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  21.00-22.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  22.00-23.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  23.00-24.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  24.00-25.00  sec   113 MBytes   946 Mbits/sec                  
[  5]  25.00-26.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  26.00-27.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  27.00-28.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  28.00-29.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  29.00-30.00  sec   111 MBytes   933 Mbits/sec                  
[  5]  30.00-31.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  31.00-32.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  32.00-33.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  33.00-34.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  34.00-35.00  sec   113 MBytes   944 Mbits/sec                  
[  5]  35.00-36.00  sec   113 MBytes   946 Mbits/sec                  
[  5]  36.00-37.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  37.00-38.00  sec   113 MBytes   944 Mbits/sec                  
[  5]  38.00-39.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  39.00-40.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  40.00-41.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  41.00-42.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  42.00-43.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  43.00-44.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  44.00-45.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  45.00-46.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  46.00-47.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  47.00-48.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  48.00-49.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  49.00-50.00  sec   113 MBytes   945 Mbits/sec                  
[  5]  50.00-51.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  51.00-52.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  52.00-53.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  53.00-54.00  sec   113 MBytes   950 Mbits/sec                  
[  5]  54.00-55.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  55.00-56.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  56.00-57.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  57.00-58.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  58.00-59.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  59.00-60.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  60.00-61.00  sec   111 MBytes   931 Mbits/sec                  
[  5]  61.00-62.00  sec   113 MBytes   946 Mbits/sec                  
[  5]  62.00-63.00  sec   112 MBytes   940 Mbits/sec                  
[  5]  63.00-64.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  64.00-65.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  65.00-66.00  sec   113 MBytes   944 Mbits/sec                  
[  5]  66.00-67.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  67.00-68.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  68.00-69.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  69.00-70.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  70.00-71.00  sec   112 MBytes   942 Mbits/sec                  
[  5]  71.00-72.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  72.00-73.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  73.00-74.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  74.00-75.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  75.00-76.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  76.00-77.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  77.00-78.00  sec   113 MBytes   945 Mbits/sec                  
[  5]  78.00-79.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  79.00-80.00  sec   112 MBytes   937 Mbits/sec                  
[  5]  80.00-81.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  81.00-82.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  82.00-83.00  sec   112 MBytes   941 Mbits/sec                  
[  5]  83.00-84.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  84.00-85.00  sec   113 MBytes   946 Mbits/sec                  
[  5]  85.00-86.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  86.00-87.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  87.00-88.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  88.00-89.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  89.00-90.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  90.00-91.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  91.00-92.00  sec   113 MBytes   948 Mbits/sec                  
[  5]  92.00-93.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  93.00-94.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  94.00-95.00  sec   113 MBytes   945 Mbits/sec                  
[  5]  95.00-96.00  sec   113 MBytes   949 Mbits/sec                  
[  5]  96.00-97.00  sec   112 MBytes   943 Mbits/sec                  
[  5]  97.00-98.00  sec   113 MBytes   945 Mbits/sec                  
[  5]  98.00-99.00  sec   113 MBytes   947 Mbits/sec                  
[  5]  99.00-100.00 sec   113 MBytes   948 Mbits/sec                  
[  5] 100.00-101.00 sec   113 MBytes   948 Mbits/sec                  
[  5] 101.00-102.00 sec   113 MBytes   948 Mbits/sec                  
[  5] 102.00-103.00 sec   113 MBytes   945 Mbits/sec                  
[  5] 103.00-104.00 sec   113 MBytes   947 Mbits/sec                  
[  5] 104.00-105.00 sec   113 MBytes   944 Mbits/sec                  
[  5] 105.00-106.00 sec   113 MBytes   948 Mbits/sec                  
[  5] 106.00-107.00 sec   113 MBytes   948 Mbits/sec                  
[  5] 107.00-108.00 sec   113 MBytes   947 Mbits/sec                  
[  5] 108.00-109.00 sec   113 MBytes   947 Mbits/sec                  
[  5] 109.00-110.00 sec   113 MBytes   946 Mbits/sec                  
[  5] 110.00-111.00 sec   113 MBytes   945 Mbits/sec                  
[  5] 111.00-112.00 sec   113 MBytes   949 Mbits/sec                  
[  5] 112.00-113.00 sec   113 MBytes   949 Mbits/sec                  
[  5] 113.00-114.00 sec   113 MBytes   948 Mbits/sec                  
[  5] 114.00-115.00 sec   113 MBytes   947 Mbits/sec                  
[  5] 115.00-116.00 sec   112 MBytes   940 Mbits/sec                  
[  5] 116.00-117.00 sec   113 MBytes   947 Mbits/sec                  
[  5] 117.00-118.00 sec   113 MBytes   949 Mbits/sec                  
[  5] 118.00-119.00 sec   113 MBytes   949 Mbits/sec                  
[  5] 119.00-120.00 sec   113 MBytes   945 Mbits/sec                  
[  5] 120.00-120.03 sec  3.39 MBytes   945 Mbits/sec                  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  5]   0.00-120.03 sec  0.00 Bytes  0.00 bits/sec                  sender
[  5]   0.00-120.03 sec  13.2 GBytes   947 Mbits/sec                  receiver
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------


結語

從舊文章測試擷圖與新文章測試結果也能看到效能上的差異,其中舊文章使用的是介面卡的網路卡,而新增加的是使用內建的網路卡,使用的Switch Hub是一樣的,效能上面能看到一些差距。

參考資料

更新日誌

日期 內容
2017/07/24 增加iPerf 3
2014/03/30 初版

關鍵字

  • 利用 iperf 測試網路效能
  • iPerf 測試網路速度
  • 網路速度測試
  • iperf iPerf
  • iperf linux winodws
  • iperf3 iperf3 iPerf3 iPerf2

  • Pingback: 利用 iperf 測試網路效能 – 可丁丹尼@一路往前走2.0 » jjjh_techinfo()

  • James Chen

    iperf –c 192.168.3.58 –w 100M –t 120 –i 1 OR -i 5 有差異.-I 1時有很多時候為0MB/SEC.同一張網卡.-I 5時則正常.WHY? 還有內接網卡98-99MB/S可是PCI 螃蟹卡只有75MB/S.WHY?

    • -i是看到report的間隔時間,設太短會造成report還沒統計就好要report,時間跟結果會有誤差

  • James Chen

    TKS for send answer to my email sd1tw@msn.com

  • James Chen

    TKS. a lot