缓慢的服务器上的SSH输出

top - 21:15:43 up 2:28, 1 user, load average: 0.54, 0.50, 0.52 Tasks: 225 total, 1 running, 223 sleeping, 0 stopped, 1 zombie Cpu(s): 0.4%us, 2.9%sy, 0.0%ni, 96.5%id, 0.2%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 8181868k total, 4332744k used, 3849124k free, 1336596k buffers Swap: 15624184k total, 0k used, 15624184k free, 169468k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 85 root 25 5 0 0 0 S 17 0.0 28:57.08 ksmd 2457 root 20 0 1232m 922m 3404 S 3 11.6 14:37.69 kvm 2431 root 20 0 2270m 1.1g 3392 S 2 14.0 7:01.86 kvm 2344 root 20 0 1981m 324m 3392 S 1 4.1 0:46.49 kvm 3911 root 20 0 2249m 320m 3364 S 1 4.0 1:57.91 kvm 10636 root 20 0 19332 1504 1056 R 0 0.0 0:00.07 top 10871 root 20 0 54732 2472 1788 S 0 0.0 0:00.01 apache2 1 root 20 0 23944 2220 1292 S 0 0.0 0:14.87 init 2 root 20 0 0 0 0 S 0 0.0 0:00.02 kthreadd 3 root RT 0 0 0 0 S 0 0.0 0:00.01 migration/0 4 root 20 0 0 0 0 S 0 0.0 0:00.10 ksoftirqd/0 5 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/0 6 root RT 0 0 0 0 S 0 0.0 0:00.01 migration/1 7 root 20 0 0 0 0 S 0 0.0 0:00.51 ksoftirqd/1 8 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/1 9 root RT 0 0 0 0 S 0 0.0 0:00.03 migration/2 10 root 20 0 0 0 0 S 0 0.0 0:00.45 ksoftirqd/2 11 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/2 12 root RT 0 0 0 0 S 0 0.0 0:00.01 migration/3 13 root 20 0 0 0 0 S 0 0.0 0:00.81 ksoftirqd/3 14 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/3 15 root RT 0 0 0 0 S 0 0.0 0:00.14 migration/4 16 root 20 0 0 0 0 S 0 0.0 0:00.13 ksoftirqd/4 17 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/4 18 root RT 0 0 0 0 S 0 0.0 0:00.15 migration/5 19 root 20 0 0 0 0 S 0 0.0 0:00.15 ksoftirqd/5 20 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/5 21 root RT 0 0 0 0 S 0 0.0 0:00.07 migration/6 22 root 20 0 0 0 0 S 0 0.0 0:00.05 ksoftirqd/6 23 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/6 24 root RT 0 0 0 0 S 0 0.0 0:00.19 migration/7 25 root 20 0 0 0 0 S 0 0.0 0:00.29 ksoftirqd/7 

以上是我的服务器顶部输出，当我做了一个top ，我发现服务器响应速度非常缓慢的键击。例如，我在命令提示符上键入virt-manager ，我可以看到，当我按任何键响应出来后明显的延迟。以上是什么原因，我应该检查什么？