Slow odroid-c2

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

Have been trying to update the system on my odroid-c2 to 9.99.17 by
doing 'pax -r -w -pe usr /' from an NFS mounted remote filesystem.

I got bored after leaving it for 24 hours and had a look at what was
happening.

Running top shows it spending a lot of time in interrupt context:

load averages:  0.37,  0.09,  0.14;               up 1+08:29:50        23:10:19
23 processes: 20 sleeping, 3 on CPU
CPU states:  0.0% user,  0.0% nice, 44.6% system, 45.9% interrupt,  9.4% idle
Memory: 1118M Act, 550M Inact, 20M Exec, 1634M File, 34M Free
Swap: 128M Total, 128M Free

  PID USERNAME PRI NICE   SIZE   RES STATE      TIME   WCPU    CPU COMMAND
    0 root     221    0     0K  124M CPU/3     50.7H   211%   211% [system]
 3525 root      36    0    12M 2200K CPU/1     64:19 41.75% 41.75% pax


# intrctl list
interrupt id          CPU0       CPU1       CPU2       CPU3  device name(s)
armgic irq 0          2517*     62193*     72143*     73559* IPI ast
armgic irq 1        184348*    142842*    134546*     94380* IPI xcall
armgic irq 2        215138*   2378624*   2669825*   2469844* IPI nop
armgic irq 3             0*         0*         0*         0* IPI shootdown
armgic irq 4             0*         0*         0*         0* IPI ddb
armgic irq 5          2065*      2511*      3730*      4482* IPI generic
armgic irq 27     11601670*  11601663*  11601659*  11601670* 
armgic irq 40  97029526197*         0          0          0  
armgic irq 62            0*         0*         0*         0* 
armgic irq 63      2745202* 239823680* 317223633* 368549715* 
armgic irq 169           0*         0          0          0  
armgic irq 170           0          0*         0          0  
armgic irq 185           0          0          0*         0  
armgic irq 186           0          0          0          0* 
armgic irq 225           0*         0*         0*         0* 
armgic irq 249           0*         0*         0*         0* 
armgic irq 250      228250*   2362529*   1628142*   3577251* 

irq 40 is awge0, irq 63 is dwctwo1. There is nothing plugged into any
of the USB ports.

Doing the same command on my Pinebook took less than 30 minutes.