sucotronic
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I've repurposed an old TV android box with armbian, just using the Olimex based image. It works peferectly, but I'm seeing a constant constant cpu usage by kworkers:
root@lime:~# uname -r 4.19.62-sunxi root@lime:~# ps auxk -%cpu | head USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 5740 8.8 0.0 0 0 ? I 10:27 1:19 [kworker/1:0-eve] root 4444 4.6 0.0 0 0 ? I 10:17 1:10 [kworker/0:0-eve] root 1 0.3 0.5 25848 5448 ? Ss 10:01 0:09 /sbin/init root 147 0.2 0.0 0 0 ? I< 10:01 0:05 [kworker/1:1H-kb] root 195 0.1 0.0 0 0 ? I< 10:01 0:04 [kworker/0:2H-kb] root 205 0.1 0.3 24544 4052 ? Ss 10:01 0:02 /lib/systemd/systemd-journald root 2 0.0 0.0 0 0 ? S 10:01 0:00 [kthreadd] root 3 0.0 0.0 0 0 ? I< 10:01 0:00 [rcu_gp] root 4 0.0 0.0 0 0 ? I< 10:01 0:00 [rcu_par_gp]
Tried to debug looking into sys dumps:
root@lime:~# echo l > /proc/sysrq-trigger root@lime:~# dmesg | tail -100 ... [ 2489.669676] sysrq: SysRq : Show backtrace of all active CPUs [ 2489.675658] NMI backtrace for cpu 1 [ 2489.675676] CPU: 1 PID: 2958 Comm: bash Not tainted 4.19.62-sunxi #5.92 [ 2489.675683] Hardware name: Allwinner sun7i (A20) Family [ 2489.675731] [<c010d74d>] (unwind_backtrace) from [<c010a2f1>] (show_stack+0x11/0x14) [ 2489.675757] [<c010a2f1>] (show_stack) from [<c08fc121>] (dump_stack+0x69/0x78) [ 2489.675782] [<c08fc121>] (dump_stack) from [<c09003a3>] (nmi_cpu_backtrace+0x8f/0x90) [ 2489.675804] [<c09003a3>] (nmi_cpu_backtrace) from [<c0900453>] (nmi_trigger_cpumask_backtrace+0xaf/0xe0) [ 2489.675828] [<c0900453>] (nmi_trigger_cpumask_backtrace) from [<c060c311>] (__handle_sysrq+0x7d/0x114) [ 2489.675850] [<c060c311>] (__handle_sysrq) from [<c060c75d>] (write_sysrq_trigger+0x49/0x54) [ 2489.675873] [<c060c75d>] (write_sysrq_trigger) from [<c0290b65>] (proc_reg_write+0x45/0x64) [ 2489.675900] [<c0290b65>] (proc_reg_write) from [<c023ef13>] (vfs_write+0x77/0x144) [ 2489.675924] [<c023ef13>] (vfs_write) from [<c023f105>] (ksys_write+0x49/0x98) [ 2489.675945] [<c023f105>] (ksys_write) from [<c0101001>] (ret_fast_syscall+0x1/0x62) [ 2489.675954] Exception stack(0xecac3fa8 to 0xecac3ff0) [ 2489.675970] 3fa0: 00000002 01131408 00000001 01131408 00000002 00000000 [ 2489.675987] 3fc0: 00000002 01131408 b6eb0d60 00000004 01131408 00000002 00000000 00000000 [ 2489.675998] 3fe0: 00000000 beb107fc b6e131bb b6e4fcf6 [ 2489.676010] Sending NMI from CPU 1 to CPUs 0: [ 2489.676300] NMI backtrace for cpu 0 [ 2489.676308] CPU: 0 PID: 205 Comm: systemd-journal Not tainted 4.19.62-sunxi #5.92 [ 2489.676313] Hardware name: Allwinner sun7i (A20) Family [ 2489.676317] PC is at fput+0x0/0x94 [ 2489.676320] LR is at path_openat+0x269/0xe0c [ 2489.676326] pc : [<c023fed0>] lr : [<c024985d>] psr: a00f0033 [ 2489.676330] sp : ed84fe40 ip : 014e8905 fp : c0e04d48 [ 2489.676335] r10: eb92a240 r9 : ffffe000 r8 : fffff000 [ 2489.676340] r7 : ed84ff70 r6 : 08010800 r5 : fffffffe r4 : ed84fec0 [ 2489.676345] r3 : 00000000 r2 : 00000011 r1 : 00000000 r0 : eb92a240 [ 2489.676351] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA Thumb Segment none [ 2489.676356] Control: 50c5387d Table: 6d8dc06a DAC: 00000051 [ 2489.676362] CPU: 0 PID: 205 Comm: systemd-journal Not tainted 4.19.62-sunxi #5.92 [ 2489.676367] Hardware name: Allwinner sun7i (A20) Family [ 2489.676372] [<c010d74d>] (unwind_backtrace) from [<c010a2f1>] (show_stack+0x11/0x14) [ 2489.676378] [<c010a2f1>] (show_stack) from [<c08fc121>] (dump_stack+0x69/0x78) [ 2489.676384] [<c08fc121>] (dump_stack) from [<c090036d>] (nmi_cpu_backtrace+0x59/0x90) [ 2489.676390] [<c090036d>] (nmi_cpu_backtrace) from [<c010c5d9>] (handle_IPI+0x85/0x2c0) [ 2489.676395] [<c010c5d9>] (handle_IPI) from [<c05c9c7f>] (gic_handle_irq+0x67/0x68) [ 2489.676401] [<c05c9c7f>] (gic_handle_irq) from [<c0101a65>] (__irq_svc+0x65/0x94) [ 2489.676406] Exception stack(0xed84fdf0 to 0xed84fe38) [ 2489.676412] fde0: eb92a240 00000000 00000011 00000000 [ 2489.676418] fe00: ed84fec0 fffffffe 08010800 ed84ff70 fffff000 ffffe000 eb92a240 c0e04d48 [ 2489.676424] fe20: 014e8905 ed84fe40 c024985d c023fed0 a00f0033 ffffffff [ 2489.676429] [<c0101a65>] (__irq_svc) from [<c023fed0>] (fput+0x0/0x94) [ 2489.676434] [<c023fed0>] (fput) from [<ed8402c0>] (0xed8402c0)
I suspect that something is happening with interrupts, so inspected /proc/interrupts, and have seen two very high values in "sunxi-mmc" and "Rescheduling interrupts":
root@lime:~# cat /proc/interrupts CPU0 CPU1 18: 0 0 GICv2 29 Level arch_timer 19: 132351 137260 GICv2 30 Level arch_timer 22: 0 0 GICv2 54 Level timer@1c20c00 23: 0 0 GICv2 113 Level sun5i_timer0 24: 0 0 GICv2 152 Level arm-pmu 25: 0 0 GICv2 153 Level arm-pmu 26: 0 0 GICv2 59 Level 1c02000.dma-controller 27: 0 0 GICv2 76 Level 1c0c000.lcd-controller 28: 0 0 GICv2 77 Level 1c0d000.lcd-controller 29: 1228805 0 GICv2 64 Level sunxi-mmc 30: 0 0 GICv2 70 Level musb-hdrc.1.auto 31: 0 0 GICv2 71 Level ehci_hcd:usb1 32: 0 0 GICv2 96 Level ohci_hcd:usb3 36: 0 0 GICv2 72 Level ehci_hcd:usb2 37: 0 0 GICv2 97 Level ohci_hcd:usb4 40: 0 0 GICv2 56 Level 1c20d00.rtc 44: 2723 0 GICv2 61 Level sun4i_gpadc_irq_chip 45: 6 0 GICv2 33 Level ttyS0 46: 692 0 GICv2 39 Level mv64xxx_i2c 47: 4 0 GICv2 40 Level mv64xxx_i2c 48: 0 0 GICv2 101 Level gp 49: 0 0 GICv2 102 Level gpmmu 50: 0 0 GICv2 103 Level pp0 51: 0 0 GICv2 104 Level ppmmu0 52: 0 0 GICv2 106 Level pp1 53: 0 0 GICv2 107 Level ppmmu1 55: 16900 0 GICv2 117 Level eth0 62: 0 0 sunxi_pio_edge 1 Edge 1c0f000.mmc cd 65: 1 0 sunxi_pio_edge 4 Edge usb0-id-det 66: 0 0 sunxi_pio_edge 5 Edge usb0-vbus-det 93: 0 0 sunxi-nmi 0 Level axp20x_irq_chip 127: 0 0 axp20x_irq_chip 33 Edge axp20x-pek-dbr 128: 0 0 axp20x_irq_chip 34 Edge axp20x-pek-dbf 133: 2722 0 sun4i_gpadc_irq_chip 1 Edge temp_data 134: 0 0 sun4i_gpadc_irq_chip 0 Edge fifo_data IPI0: 0 0 CPU wakeup interrupts IPI1: 0 0 Timer broadcast interrupts IPI2: 26187 512258 Rescheduling interrupts IPI3: 312 262 Function call interrupts IPI4: 0 0 CPU stop interrupts IPI5: 2553 2019 IRQ work interrupts IPI6: 0 0 completion interruptsIs this normal in an A20 board or something fixable by configuration/tunning/whatever?
High cpu usage by interrupts in A20 system
in Allwinner CPU Boxes
Posted
Wow, that was a very helpful answer, thanks a lot!!
With that info I can just blacklist that modules (anyway, I'm not interested in using the ADC functionality of the A20 :P) and now the system shows proper low cpu usage: