使用SSH 命令操作也没感觉 很慢.就是访问
top - 16:10:43 up 50 min, 2 users, load average: 4.72, 4.58, 4.35
Tasks: 114 total, 1 running, 113 sleeping, 0 stopped, 0 zombie
%Cpu(s): 18.7 us, 3.0 sy, 0.0 ni, 37.5 id, 40.6 wa, 0.2 hi, 0.0 si, 0.0 st
KiB Mem: 7693560 total, 1957232 used, 5736328 free, 47460 buffers
KiB Swap: 0 total, 0 used, 0 free. 1291540 cached Mem
Total DISK READ : 0.00 B/s | Total DISK WRITE : 0.00 B/s
Actual DISK READ: 0.00 B/s | Actual DISK WRITE: 0.00 B/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
5972 be/4 www 0.00 B/s 0.00 B/s 0.00 % 99.99 % nginx: worker process
1 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % init
2 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kthreadd]
3 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/0]
4 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/0:0]
5 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/0:0H]
7 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcu_sched]
8 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcuos/0]
9 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcuos/1]
10 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcuos/2]
11 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcuos/3]
12 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcu_bh]
13 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcuob/0]
14 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcuob/1]
15 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcuob/2]
16 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rcuob/3]
17 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [migration/0]
18 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/0]
19 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/1]
20 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [migration/1]
21 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/1]
22 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/1:0]
23 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/1:0H]
24 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/2]
25 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [migration/2]
26 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/2]
27 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/2:0]
28 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/2:0H]
29 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/3]
30 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [migration/3]
31 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/3]
32 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/3:0]
33 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/3:0H]
34 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [khelper]
35 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kdevtmpfs]
36 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [netns]
37 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [xenwatch]
38 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [xenbus]
39 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [writeback]
40 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kintegrityd]
41 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [bioset]
42 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/u9:0]
43 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kblockd]
44 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/1:1]
45 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ata_sff]
46 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [khubd]
47 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [md]
48 be/0 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [devfreq_wq]
CPU型号 [4核] Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz | 频率:2793.304 | 二级缓存:25600 KB | Bogomips:5586.60 ×4
内存使用状况
内存参数解读 物理内存：共 7.337 GB , 已用 0.948 GB , 空闲 6.389 GB , 使用率 12.92%
Cache化内存为 0.239 GB , 使用率 3.25 % | Buffers缓冲为 0.052 GB
真实内存使用 0.657 GB , 真实内存空闲 6.68 GB , 使用率 8.96 %
系统平均负载 5.95 4.89 4.70 1/172
Linux 3.13.0-29-generic (ip-172-31-8-92) 09/26/2014 _x86_64_ (4 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
15.47 0.00 3.42 36.55 0.16 44.40
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
xvdap1 20.57 65.31 1718.47 268101 7054072
你需要补充一下你机器的配置。比如cpu核数，内存啥的。看起来你的负载并不是很高，才4而已，cpu的wa比较高，说明cpu在等待磁盘io。你使用iostat再看一下磁盘io情况
负载不算高；安装iotop，然后执行
贴。
看起来是nginx 问题，对这个东西咱不了解，只知道点apache。所以看看这个文章是不是对你有帮助吧：http://www.oschina.net/question/54100_30419