從遠端伺服器執行 apache bench 的連接時間很慢

我正在嘗試用 ab 衡量 nginx 的性能。從本地機器上做同樣的 ab 給我每秒的請求大約是來自位於同一網路上的遠端機器上的 10 倍。

Local results:
Server Software:        nginx
Server Hostname:        192.168.0.116
Server Port:            8000

Document Path:          /data/adpix/picture/test.jpg
Document Length:        4602 bytes

Concurrency Level:      1000
Time taken for tests:   1.475 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      49854651 bytes
HTML transferred:       46622862 bytes
Requests per second:    6778.38 [#/sec] (mean)
Time per request:       147.528 [ms] (mean)
Time per request:       0.148 [ms] (mean, across all concurrent requests)
Transfer rate:          33001.34 [Kbytes/sec] received

Connection Times (ms)
             min  mean[+/-sd] median   max
Connect:       25   67  24.4     66     137
Processing:    28   73  24.9     71     146
Waiting:       13   42  19.7     40     110
Total:         75  140  17.9    139     182

現在從遠端機器：

Server Software:        nginx
Server Hostname:        192.168.0.116
Server Port:            80

Document Path:          /data/adpix/picture/test.jpg
Document Length:        4602 bytes

Concurrency Level:      1000
Time taken for tests:   14.422 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      51737663 bytes
HTML transferred:       48380826 bytes
Requests per second:    693.40 [#/sec] (mean)
Time per request:       1442.165 [ms] (mean)
Time per request:       1.442 [ms] (mean, across all concurrent requests)
Transfer rate:          3503.42 [Kbytes/sec] received

Connection Times (ms)
             min  mean[+/-sd] median   max
Connect:       68  230 182.7    166    3052
Processing:   110 1113 2918.5    227   11862
Waiting:       20  648 2101.1    189   11451
Total:        246 1344 2898.0    387   11981

問題似乎在連接時間內。

網路速度很快。Netperf 返回 80 Mb/s 兩台機器都是託管在 2 台執行四核的不同物理機器上的虛擬機。通過千兆交換機連接。

有人知道可能是什麼問題嗎？

感謝您的任何幫助。

這似乎完全正常，只是由於數據包交換時間和光纖中的光速。是什麼讓你覺得 1.442ms 很“慢”？

引用自：https://serverfault.com/questions/362053