HDMI 图像显示性能测试
usb cam（C270）
Linux 3.9.7
s5pv210
Camera 设置5 帧的时候，显示有些卡顿，但是cpu利用率比较低 45%左右，
Camera设置10帧的时候，显示比较流畅，感觉不到延时，cpu利用率最高%75，
但是继续提高camera的帧率，在30帧的时候，cpu占用率反而小了66%左右，
FPS 10
CPU: 44.5% usr 1.1% sys 0.0% nic 54.2% idle 0.0% io 0.0% irq 0.0% sirq
Load average: 0.36 0.24 0.11 2/41 970
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
967 946 0 S 32968 7.5 0 45.4 ./cam
970 946 0 R 3036 0.6 0 0.2 top
946 1 0 S 3036 0.6 0 0.0 -/bin/sh
1 0 0 S 3032 0.6 0 0.0 init
908 2 0 SW 0 0.0 0 0.0 [kworker/0:2]
3 2 0 SW 0 0.0 0 0.0 [ksoftirqd/0]
6 2 0 SW 0 0.0 0 0.0 [kworker/u:0]
307 2 0 SW 0 0.0 0 0.0 [bdi-default]
321 2 0 SW 0 0.0 0 0.0 [khubd]
8 2 0 SW 0 0.0 0 0.0 [rcu_preempt]
2 0 0 SW 0 0.0 0 0.0 [kthreadd]
5 2 0 SW< 0 0.0 0 0.0 [kworker/0:0H]
7 2 0 SW< 0 0.0 0 0.0 [kworker/u:0H]
9 2 0 SW 0 0.0 0 0.0 [rcu_bh]
10 2 0 SW 0 0.0 0 0.0 [rcu_sched]
11 2 0 SW 0 0.0 0 0.0 [watchdog/0]
12 2 0 SW< 0 0.0 0 0.0 [khelper]
13 2 0 SW 0 0.0 0 0.0 [kdevtmpfs]
14 2 0 SW< 0 0.0 0 0.0 [netns]
15 2 0 SW 0 0.0 0 0.0 [kworker/u:1]
FPS 15
Mem: 35308K used, 403156K free, 0K shrd, 156K buff, 8776K cached
CPU: 73.0% usr 1.6% sys 0.0% nic 25.2% idle 0.0% io 0.0% irq 0.0% sirq
Load average: 0.61 0.36 0.18 2/41 974
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
971 946 0 S 32968 7.5 0 74.3 ./cam
974 946 0 R 3036 0.6 0 0.2 top
946 1 0 S 3036 0.6 0 0.0 -/bin/sh
1 0 0 S 3032 0.6 0 0.0 init
908 2 0 SW 0 0.0 0 0.0 [kworker/0:2]
3 2 0 SW 0 0.0 0 0.0 [ksoftirqd/0]
6 2 0 SW 0 0.0 0 0.0 [kworker/u:0]
307 2 0 SW 0 0.0 0 0.0 [bdi-default]
321 2 0 SW 0 0.0 0 0.0 [khubd]
8 2 0 SW 0 0.0 0 0.0 [rcu_preempt]
2 0 0 SW 0 0.0 0 0.0 [kthreadd]
5 2 0 SW< 0 0.0 0 0.0 [kworker/0:0H]
7 2 0 SW< 0 0.0 0 0.0 [kworker/u:0H]
9 2 0 SW 0 0.0 0 0.0 [rcu_bh]
10 2 0 SW 0 0.0 0 0.0 [rcu_sched]
11 2 0 SW 0 0.0 0 0.0 [watchdog/0]
12 2 0 SW< 0 0.0 0 0.0 [khelper]
13 2 0 SW 0 0.0 0 0.0 [kdevtmpfs]
14 2 0 SW< 0 0.0 0 0.0 [netns]
15 2 0 SW 0 0.0 0 0.0 [kworker/u:1]
FPS 20
CPU: 68.8% usr 1.2% sys 0.0% nic 29.9% idle 0.0% io 0.0% irq 0.0% sirq
Load average: 0.30 0.40 0.23 1/41 984
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
981 946 0 S 32968 7.5 0 69.8 ./cam
984 946 0 R 3036 0.6 0 0.2 top
946 1 0 S 3036 0.6 0 0.0 -/bin/sh
1 0 0 S 3032 0.6 0 0.0 init
908 2 0 SW 0 0.0 0 0.0 [kworker/0:2]
3 2 0 SW 0 0.0 0 0.0 [ksoftirqd/0]
6 2 0 SW 0 0.0 0 0.0 [kworker/u:0]
307 2 0 SW 0 0.0 0 0.0 [bdi-default]
321 2 0 SW 0 0.0 0 0.0 [khubd]
8 2 0 SW 0 0.0 0 0.0 [rcu_preempt]
2 0 0 SW 0 0.0 0 0.0 [kthreadd]
5 2 0 SW< 0 0.0 0 0.0 [kworker/0:0H]
7 2 0 SW< 0 0.0 0 0.0 [kworker/u:0H]
9 2 0 SW 0 0.0 0 0.0 [rcu_bh]
10 2 0 SW 0 0.0 0 0.0 [rcu_sched]
11 2 0 SW 0 0.0 0 0.0 [watchdog/0]
12 2 0 SW< 0 0.0 0 0.0 [khelper]
13 2 0 SW 0 0.0 0 0.0 [kdevtmpfs]
14 2 0 SW< 0 0.0 0 0.0 [netns]
15 2 0 SW 0 0.0 0 0.0 [kworker/u:1]
FPS 25
Mem: 35560K used, 402904K free, 0K shrd, 156K buff, 8860K cached
CPU: 67.0% usr 1.0% sys 0.0% nic 32.0% idle 0.0% io 0.0% irq 0.0% sirq
Load average: 0.61 0.50 0.29 2/41 988
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
985 946 0 S 32968 7.5 0 67.7 ./cam
988 946 0 R 3036 0.6 0 0.2 top
946 1 0 S 3036 0.6 0 0.0 -/bin/sh
1 0 0 S 3032 0.6 0 0.0 init
908 2 0 SW 0 0.0 0 0.0 [kworker/0:2]
3 2 0 SW 0 0.0 0 0.0 [ksoftirqd/0]
6 2 0 SW 0 0.0 0 0.0 [kworker/u:0]
307 2 0 SW 0 0.0 0 0.0 [bdi-default]
321 2 0 SW 0 0.0 0 0.0 [khubd]
8 2 0 SW 0 0.0 0 0.0 [rcu_preempt]
2 0 0 SW 0 0.0 0 0.0 [kthreadd]
5 2 0 SW< 0 0.0 0 0.0 [kworker/0:0H]
7 2 0 SW< 0 0.0 0 0.0 [kworker/u:0H]
9 2 0 SW 0 0.0 0 0.0 [rcu_bh]
10 2 0 SW 0 0.0 0 0.0 [rcu_sched]
11 2 0 SW 0 0.0 0 0.0 [watchdog/0]
12 2 0 SW< 0 0.0 0 0.0 [khelper]
13 2 0 SW 0 0.0 0 0.0 [kdevtmpfs]
14 2 0 SW< 0 0.0 0 0.0 [netns]
15 2 0 SW 0 0.0 0 0.0 [kworker/u:1]
FPS 30
Mem: 35596K used, 402868K free, 0K shrd, 156K buff, 8888K cached
CPU: 65.1% usr 1.0% sys 0.0% nic 33.8% idle 0.0% io 0.0% irq 0.0% sirq
Load average: 0.76 0.59 0.35 2/41 992
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
989 946 0 S 32968 7.5 0 66.1 ./cam
992 946 0 R 3036 0.6 0 0.0 top
946 1 0 S 3036 0.6 0 0.0 -/bin/sh
1 0 0 S 3032 0.6 0 0.0 init
908 2 0 SW 0 0.0 0 0.0 [kworker/0:2]
3 2 0 SW 0 0.0 0 0.0 [ksoftirqd/0]
6 2 0 SW 0 0.0 0 0.0 [kworker/u:0]
307 2 0 SW 0 0.0 0 0.0 [bdi-default]
321 2 0 SW 0 0.0 0 0.0 [khubd]
8 2 0 SW 0 0.0 0 0.0 [rcu_preempt]
11 2 0 SW 0 0.0 0 0.0 [watchdog/0]
2 0 0 SW 0 0.0 0 0.0 [kthreadd]
5 2 0 SW< 0 0.0 0 0.0 [kworker/0:0H]
7 2 0 SW< 0 0.0 0 0.0 [kworker/u:0H]
9 2 0 SW 0 0.0 0 0.0 [rcu_bh]
10 2 0 SW 0 0.0 0 0.0 [rcu_sched]
12 2 0 SW< 0 0.0 0 0.0 [khelper]
13 2 0 SW 0 0.0 0 0.0 [kdevtmpfs]
14 2 0 SW< 0 0.0 0 0.0 [netns]
15 2 0 SW 0 0.0 0 0.0 [kworker/u:1]