Recently, I have been dealing with very high RAM usage on my Unraid server, without a clear cause to pin it down to. When all my docker containers and VMs are running, I'm getting as high as 28 out of 32 GBs of RAM. After shutting down all containers and VMs and disabling both docker and VM support in settings, the system still reports 20GB used:
root@home-server:~# free -h total used free shared buff/cache available Mem: 30Gi 20Gi 9.1Gi 652Mi 1.1Gi 9.1Gi Swap: 0B 0B 0B
As this shows, it's not memory cache causing it, as the RAM is reported as actually used. Accounting for 4GB of ZFS arc, this left around 16GB used only for the OS and some plugins, which I found to be quite strange.
So I ran
ps aux | awk '{print $6/1024 " MB\t\t" $11}' | sort -n
to get memory usage by process. This was its output (note it sorts from smallest to biggest, output is truncated at the beginning; in spoiler because of length):
<continues with more dhcpcd processes> 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.23828 MB dhcpcd: 4.24219 MB dhcpcd: 4.24219 MB dhcpcd: 4.24219 MB dhcpcd: 4.24219 MB dhcpcd: 4.24219 MB dhcpcd: 4.25 MB dhcpcd: 4.25 MB dhcpcd: 4.25391 MB dhcpcd: 4.25391 MB dhcpcd: 4.25781 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26172 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26562 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.26953 MB dhcpcd: 4.27344 MB dhcpcd: 4.28125 MB 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4.39453 MB dhcpcd: 4.39453 MB dhcpcd: 4.39844 MB dhcpcd: 4.39844 MB dhcpcd: 4.40234 MB dhcpcd: 4.40234 MB dhcpcd: 4.40625 MB dhcpcd: 4.40625 MB dhcpcd: 4.40625 MB dhcpcd: 4.40625 MB dhcpcd: 4.40625 MB dhcpcd: 4.40625 MB dhcpcd: 4.40625 MB dhcpcd: 4.40625 MB dhcpcd: 4.40625 MB dhcpcd: 4.40625 MB dhcpcd: 4.41016 MB dhcpcd: 4.41016 MB dhcpcd: 4.41016 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42188 MB dhcpcd: 4.42578 MB dhcpcd: 4.43359 MB dhcpcd: 4.43359 MB dhcpcd: 4.43359 MB dhcpcd: 4.43359 MB dhcpcd: 4.43359 MB dhcpcd: 4.43359 MB dhcpcd: 4.43359 MB dhcpcd: 4.43359 MB dhcpcd: 4.44141 MB dhcpcd: 4.44922 MB dhcpcd: 4.45312 MB dhcpcd: 4.45703 MB dhcpcd: 4.46094 MB dhcpcd: 4.46875 MB dhcpcd: 4.46875 MB dhcpcd: 4.46875 MB dhcpcd: 4.46875 MB dhcpcd: 4.47656 MB 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5.04297 MB dhcpcd: 5.04297 MB dhcpcd: 5.04688 MB dhcpcd: 5.07812 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.09375 MB dhcpcd: 5.12109 MB dhcpcd: 5.12109 MB dhcpcd: 5.13281 MB dhcpcd: 5.13281 MB dhcpcd: 5.13281 MB dhcpcd: 5.13281 MB dhcpcd: 5.13281 MB dhcpcd: 5.44531 MB dhcpcd: 6.35938 MB /usr/sbin/smbd 7.77734 MB sshd: 7.85547 MB lsof 7.97266 MB sshd: 8.83203 MB -bash 8.9375 MB /usr/sbin/smbd 9.19922 MB php-fpm: 9.67578 MB nginx: 10.1641 MB /usr/sbin/winbindd 10.9023 MB nginx: 11.6797 MB /usr/sbin/winbindd 13.2695 MB /usr/sbin/smbd 13.293 MB /usr/bin/php 13.6953 MB -bash 14.2344 MB php-fpm: 14.2344 MB php-fpm: 14.2383 MB php-fpm: 14.375 MB /usr/sbin/winbindd 14.625 MB /usr/bin/php 28.7656 MB /usr/bin/php 28.9492 MB /usr/bin/php 29.3281 MB /usr/bin/php 29.3633 MB /usr/bin/php 29.6875 MB /usr/bin/php 29.7227 MB /usr/bin/php 29.7461 MB /usr/bin/php 29.7891 MB /usr/bin/php 30.082 MB /usr/bin/php 30.2031 MB /usr/bin/php 33.3516 MB /usr/local/bin/shfs 125.398 MB /usr/local/sbin/tailscaled
The OS spawned a huge amount of of `dhcpcd
processes. Since they all take about 4-5MB of RAM, this had severe impact on free RAM. Running `free -h` again after disabling the feature yielded the following result:
total used free shared buff/cache available Mem: 30Gi 3.7Gi 26Gi 652Mi 848Mi 26Gi Swap: 0B 0B 0B
This is much more in line with what I would expect. I don't know exactly why enabling IPv6 privacy extensions causes this, or if it is even expected behaviour (in this case users maybe should be warned about the resource impact), but I thought I'd report it since it took me a while to find the issue and maybe it will help someone else.
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