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内核:3.8.13
ARM: IBOX 4412
camera分辨率 640x480
160000(1.6G)时4核全开,
echo Peformance > scaling_governor
Mem: 58220K used, 969844K free, 0K shrd, 268K buff, 2524K cached CPU: 49.7% usr 1.4% sys 0.0% nic 48.7% idle 0.0% io 0.0% irq 0.0% sirq Load average: 1.01 0.67 0.30 2/59 1427 PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND 1412 1399 0 R 5004 0.4 0 49.7 ./cam_previewfb0v3 1427 1399 0 R 2392 0.2 1 1.4 top -d1 1399 1 0 S 2392 0.2 0 0.0 -/bin/sh 1 0 0 S 2388 0.2 3 0.0 init 372 2 0 SW 0 0.0 0 0.0 [khubd] 34 2 0 SW 0 0.0 1 0.0 [kworker/1:1] 6 2 0 SW 0 0.0 1 0.0 [kworker/u:0] 16 2 0 RW 0 0.0 2 0.0 [ksoftirqd/2] 9 2 0 SW 0 0.0 1 0.0 [rcu_preempt] 13 2 0 SW 0 0.0 1 0.0 [migration/1] 1356 2 0 SW 0 0.0 0 0.0 [kworker/0:3] 1324 2 0 SW 0 0.0 0 0.0 [mmcqd/0] 26 2 0 SW 0 0.0 1 0.0 [kdevtmpfs] 2 0 0 SW 0 0.0 1 0.0 [kthreadd] 3 2 0 SW 0 0.0 0 0.0 [ksoftirqd/0] 4 2 0 SW 0 0.0 0 0.0 [kworker/0:0] 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] 8 2 0 SW 0 0.0 0 0.0 [migration/0] 10 2 0 SW 0 0.0 0 0.0 [rcu_bh]
最大频率设置1G时,四核全开
Mem: 59380K used, 968684K free, 0K shrd, 272K buff, 2524K cached CPU: 24.6% usr 0.2% sys 0.0% nic 74.8% idle 0.2% io 0.0% irq 0.0% sirq Load average: 0.82 0.79 0.48 2/61 1471 PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND 1412 1399 0 R 5004 0.4 0 24.6 ./cam_previewfb0v3 1471 1399 0 R 2392 0.2 3 0.2 top -d1 1399 1 0 S 2392 0.2 1 0.0 -/bin/sh 1 0 0 S 2388 0.2 3 0.0 init 34 2 0 SW 0 0.0 1 0.0 [kworker/1:1] 372 2 0 SW 0 0.0 0 0.0 [khubd] 1356 2 0 SW 0 0.0 0 0.0 [kworker/0:3] 6 2 0 SW 0 0.0 2 0.0 [kworker/u:0] 16 2 0 SW 0 0.0 2 0.0 [ksoftirqd/2] 9 2 0 SW 0 0.0 3 0.0 [rcu_preempt] 1324 2 0 SW 0 0.0 3 0.0 [mmcqd/0] 13 2 0 SW 0 0.0 1 0.0 [migration/1] 26 2 0 SW 0 0.0 1 0.0 [kdevtmpfs] 35 2 0 SW 0 0.0 2 0.0 [kworker/2:1] 37 2 0 SW 0 0.0 3 0.0 [kworker/3:1] 1385 2 0 SW 0 0.0 1 0.0 [jbd2/mmcblk1p3-] 1411 2 0 SW 0 0.0 1 0.0 [flush-179:0] 2 0 0 SW 0 0.0 1 0.0 [kthreadd] 3 2 0 SW 0 0.0 0 0.0 [ksoftirqd/0] 4 2 0 SW 0 0.0 0 0.0 [kworker/0:0]
最大频率设置1G时,开3个核
Mem: 59080K used, 968984K free, 0K shrd, 288K buff, 2524K cached CPU: 32.7% usr 0.3% sys 0.0% nic 66.8% idle 0.0% io 0.0% irq 0.0% sirq Load average: 0.91 0.82 0.52 2/60 1477 PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND 1412 1399 0 R 5004 0.4 0 32.7 ./cam_previewfb0v3 1477 1399 0 R 2392 0.2 3 0.3 top -d1 1399 1 0 S 2392 0.2 3 0.0 -/bin/sh 1 0 0 S 2388 0.2 3 0.0 init 34 2 0 SW 0 0.0 1 0.0 [kworker/1:1] 372 2 0 SW 0 0.0 0 0.0 [khubd] 1356 2 0 SW 0 0.0 0 0.0 [kworker/0:3] 6 2 0 SW 0 0.0 2 0.0 [kworker/u:0] 16 2 0 SW 0 0.0 2 0.0 [ksoftirqd/2] 9 2 0 SW 0 0.0 3 0.0 [rcu_preempt] 1324 2 0 SW 0 0.0 3 0.0 [mmcqd/0] 35 2 0 SW 0 0.0 2 0.0 [kworker/2:1] 26 2 0 SW 0 0.0 1 0.0 [kdevtmpfs] 37 2 0 SW 0 0.0 3 0.0 [kworker/3:1] 1385 2 0 SW 0 0.0 2 0.0 [jbd2/mmcblk1p3-] 1411 2 0 SW 0 0.0 2 0.0 [flush-179:0] 2 0 0 SW 0 0.0 1 0.0 [kthreadd] 3 2 0 SW 0 0.0 0 0.0 [ksoftirqd/0] 4 2 0 SW 0 0.0 0 0.0 [kworker/0:0] 5 2 0 SW< 0 0.0 0 0.0 [kworker/0:0H]
Mem: 57916K used, 970148K free, 0K shrd, 300K buff, 2524K cached CPU: 68.3% usr 0.0% sys 0.0% nic 31.6% idle 0.0% io 0.0% irq 0.0% sirq Load average: 0.76 0.80 0.53 2/58 1481 PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND 1412 1399 0 R 5004 0.4 0 67.2 ./cam_previewfb0v3 1481 1399 0 R 2392 0.2 0 0.9 top -d1 1399 1 0 S 2392 0.2 0 0.0 -/bin/sh 1 0 0 S 2388 0.2 3 0.0 init 34 2 0 SW 0 0.0 1 0.0 [kworker/1:1] 372 2 0 SW 0 0.0 0 0.0 [khubd] 1356 2 0 SW 0 0.0 0 0.0 [kworker/0:3] 6 2 0 SW 0 0.0 0 0.0 [kworker/u:0] 16 2 0 RW 0 0.0 2 0.0 [ksoftirqd/2] 9 2 0 SW 0 0.0 0 0.0 [rcu_preempt] 1324 2 0 SW 0 0.0 0 0.0 [mmcqd/0] 35 2 0 SW 0 0.0 2 0.0 [kworker/2:1] 1385 2 0 SW 0 0.0 0 0.0 [jbd2/mmcblk1p3-] 26 2 0 SW 0 0.0 1 0.0 [kdevtmpfs] 37 2 0 SW 0 0.0 3 0.0 [kworker/3:1] 1411 2 0 SW 0 0.0 0 0.0 [flush-179:0] 2 0 0 SW 0 0.0 1 0.0 [kthreadd] 3 2 0 SW 0 0.0 0 0.0 [ksoftirqd/0] 4 2 0 SW 0 0.0 0 0.0 [kworker/0:0] 5 2 0 SW< 0 0.0 0 0.0 [kworker/0:0H]
最低性能模式时, 频率200MHz,只开了两个核(lcd预览画面十分卡顿)
echo powersave > cpu0/cpufreq/scaling_governor
CPU3: shutdown
CPU2: shutdown
Mem: 58672K used, 969392K free, 0K shrd, 340K buff, 2524K cached CPU: 49.7% usr 1.9% sys 0.0% nic 48.3% idle 0.0% io 0.0% irq 0.0% sirq Load average: 0.99 0.80 0.65 2/59 1495 PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND 1412 1399 0 R 5004 0.4 0 49.7 ./cam_previewfb0v3 1495 1399 0 R 2392 0.2 1 1.4 top -d1 1399 1 0 S 2392 0.2 1 0.0 -/bin/sh 1 0 0 S 2388 0.2 3 0.0 init 34 2 0 SW 0 0.0 1 0.0 [kworker/1:1] 372 2 0 SW 0 0.0 0 0.0 [khubd] 1356 2 0 SW 0 0.0 0 0.0 [kworker/0:3] 6 2 0 SW 0 0.0 3 0.0 [kworker/u:0] 4 2 0 SW 0 0.0 0 0.0 [kworker/0:0] 9 2 0 SW 0 0.0 1 0.0 [rcu_preempt] 16 2 0 RW 0 0.0 2 0.0 [ksoftirqd/2] 1324 2 0 SW 0 0.0 1 0.0 [mmcqd/0] 35 2 0 SW 0 0.0 2 0.0 [kworker/2:1] 37 2 0 SW 0 0.0 3 0.0 [kworker/3:1] 1385 2 0 SW 0 0.0 1 0.0 [jbd2/mmcblk1p3-] 1411 2 0 SW 0 0.0 1 0.0 [flush-179:0] 14 2 0 SW 0 0.0 1 0.0 [kworker/1:0] 26 2 0 SW 0 0.0 1 0.0 [kdevtmpfs] 2 0 0 SW 0 0.0 0 0.0 [kthreadd] 3 2 0 SW 0 0.0 0 0.0 [ksoftirqd/0]
Mem: 58020K used, 970044K free, 0K shrd, 352K buff, 2524K cached CPU: 97.1% usr 2.8% sys 0.0% nic 0.0% idle 0.0% io 0.0% irq 0.0% sirq Load average: 1.00 0.87 0.69 2/58 1500 PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND 1412 1399 0 R 5004 0.4 0 97.0 ./cam_previewfb0v3 1500 1399 0 R 2392 0.2 0 2.8 top -d1 1399 1 0 S 2392 0.2 0 0.0 -/bin/sh 1 0 0 S 2388 0.2 3 0.0 init 34 2 0 SW 0 0.0 1 0.0 [kworker/1:1] 372 2 0 SW 0 0.0 0 0.0 [khubd] 4 2 0 SW 0 0.0 0 0.0 [kworker/0:0] 1356 2 0 SW 0 0.0 0 0.0 [kworker/0:3] 6 2 0 SW 0 0.0 0 0.0 [kworker/u:0] 9 2 0 SW 0 0.0 0 0.0 [rcu_preempt] 16 2 0 RW 0 0.0 2 0.0 [ksoftirqd/2] 1324 2 0 SW 0 0.0 0 0.0 [mmcqd/0] 35 2 0 SW 0 0.0 2 0.0 [kworker/2:1] 14 2 0 SW 0 0.0 1 0.0 [kworker/1:0] 37 2 0 SW 0 0.0 3 0.0 [kworker/3:1] 1385 2 0 SW 0 0.0 0 0.0 [jbd2/mmcblk1p3-] 1411 2 0 SW 0 0.0 0 0.0 [flush-179:0] 8 2 0 SW 0 0.0 0 0.0 [migration/0] 26 2 0 SW 0 0.0 1 0.0 [kdevtmpfs] 2 0 0 SW 0 0.0 0 0.0 [kthreadd]
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原文地址:http://blog.csdn.net/liujia2100/article/details/42928759