kswapd0 99.99% IO usage?

[Antwan]

Hello,

 

Im using a Orange Pi Zero, running nginx with Nextcloud.

 

Im noticing 99.99% usage on the IO reported by iotop, but disk read and disk write show 0%.

Even a refresh on the homepage bumps it up to the top of the IO list.

 

 

As far as I am informed... isn't kswapd0 supposed to deal with swap memory and go wild when I am about to run out of RAM?

 

I have disabled (hopefully), my swap partition, but I am still getting this. I have commented out the swap line in fstab... htop reports 0KB SWAP. 

It doesn't seem that I am running out of memory. About 50% of it appears to be free all the time.

 

I am really new to dev boards and such, but this didn't appear on my raspberry pi zero, running pretty much the same setup on Raspbian. 

 

Am I doing something wrong or is this normal?

 

 

It stays like this for most of the time:

   38 be/4 root        0.00 B/s    0.00 B/s  0.00 % 95.43 % [kswapd0]
 1634 be/4 www-data    0.00 B/s  640.50 K/s  0.00 %  0.00 % nginx: worker process
    1 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % init
    2 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [kthreadd]
    3 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [ksoftirqd/0]
    5 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [kworker/u:0]
    6 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [migration/0]
    7 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [watchdog/0]
    8 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [migration/1]
 1545 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % NetworkManager --no-daemon
   10 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [ksoftirqd/1]
   11 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [watchdog/1]
   12 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [migration/2]
   14 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [ksoftirqd/2]
   15 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [watchdog/2]
   16 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [migration/3]
   18 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [ksoftirqd/3]
   19 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [watchdog/3]
   20 be/0 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [cpuset]
   21 be/0 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [khelper]

And it pops and switches to something like this from time to time:

  408 be/4 www-data    6.82 K/s   88.63 K/s  0.00 % 65.34 % php-fpm: pool www
  452 be/3 root        0.00 B/s   13.64 K/s  0.00 % 46.93 % [jbd2/mmcblk0p1-]
   38 be/4 root        0.00 B/s    0.00 B/s  0.00 % 13.55 % [kswapd0]
 1025 be/4 root      109.09 K/s    0.00 B/s  0.00 % 13.35 % wpa_supplicant -s -B -P /run/wpa_supplicant.wlan0.pid -i wlan0 -D nl80211,wext -c /etc/wpa_supplicant/wpa_supplicant.conf
 1782 be/4 ntp       221.58 K/s    0.00 B/s  0.00 %  2.42 % ntpd -p /var/run/ntpd.pid -g -u 105:110
 3248 be/4 www-data  146.58 K/s 1711.28 K/s  0.00 %  1.81 % php-fpm: pool www
 1632 be/4 www-data    0.00 B/s  395.43 K/s  0.00 %  0.00 % nginx: worker process
    1 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % init
    2 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [kthreadd]
    3 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [ksoftirqd/0]
    5 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [kworker/u:0]

Here is what it looks like running "apt-get update":

   38 be/4 root        0.00 B/s    0.00 B/s  0.00 % 79.24 % [kswapd0]
 7901 be/4 root      134.70 K/s    0.00 B/s  0.00 %  1.14 % -bash
 1515 be/4 root       95.71 K/s    0.00 B/s  0.00 %  0.54 % haveged --Foreground --verbose=1 --write=1024
 1590 be/4 root        3.54 K/s    3.54 K/s  0.00 %  0.18 % rsyslogd -n [rs:main Q:Reg]
    1 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % init
    2 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [kthreadd]
    3 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [ksoftirqd/0]
    5 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [kworker/u:0]
    6 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [migration/0]
    7 rt/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [watchdog/0]

             total       used       free     shared    buffers     cached
Mem:           241        133        107         17          2         32
-/+ buffers/cache:         99        142
Swap:            0          0          0

Sorry if this is a stupid question.

 

Thank you.

 

 

EDIT: ARMBIAN Debian GNU/Linux 8 (jessie) 3.4.113-sun8i

UPDATE: ARMBIAN 5.24.170112 nightly Debian GNU/Linux 8 (jessie) 3.4.113-sun8i    - same thing!