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!