Adguardhome: CPU consumption at 100% in Raspberry Pi

[omata]

Steps to reproduce

1. Install AdGuard Home for Raspberry Pi
2. Start the service

Expected behavior

I expected that it could work just like pi-hole service, with minimal CPU consumption and amazing performance.

Actual behavior

It did fire the Raspberry Pi CPU up to 100% with each request rendering the service useless after the second request. Just with open one Web site the Pi is getting 100% of CPU usage. In comparison, pi-hole doesn't even touch the CPU usage, it is always under 1%. I'm guessing that Go Language doesn't have good performance in ARM based devices, or it is because the monolitic nature of AdGuard Home.

Your environment

| Description | Value |
| -------------- | ------------ |
| Version of AdGuard Home server:| v0.9
| How did you setup DNS configuration:| Mikrotik Router
| If it's a router or IoT, please write device model:| Raspberry Pi first version/generation
| Operating system and version:| Raspbian GNU/Linux 9.4 (stretch)

[hmage]

Hi!

By default, we use dns-over-tls. Try setting upstream servers to 8.8.8.8 and 8.8.4.4 without tls://, this should help dramatically with performance.

[omata]

Hi!

By default, we use dns-over-tls. Try setting upstream servers to 8.8.8.8 and 8.8.4.4 without tls://, this should help dramatically with performance.

Just being curious, ¿Why change CloudFlare DNS by the Google DNS?

[hmage]

Doesn't matter as long as it's not tls, since first gen Pi can't handle DNS encryption via DoH.

[hmage]

Also, are you using raspberry pi to browse the web interface? We recommend you use your desktop's browser to access the dashboard, since at this moment it's very JS-heavy.

[omata]

Also, are you using raspberry pi to browse the web interface? We recommend you use your desktop's browser to access the dashboard.

No, I'm using my desktop browser, (Chrome for OSX). My Raspberry PI have a headless slim version of Debian Stretch.

[omata]

Doesn't matter as long as it's not tls, since first gen Pi can't handle DNS encryption via DoH.

What DoH does mean?

[hmage]

@omata sorry, I was meaning to write DoT — that's DNS over TLS — https://en.wikipedia.org/wiki/DNS_over_TLS

CloudFlare supports it and we're using it as default, apparently it wasn't a great idea to have it as default on first-gen raspberry pi — we tested on third-gen, which handles that quite well.

[omata]

@omata sorry, I was meaning to write DoT — that's DNS over TLS — https://en.wikipedia.org/wiki/DNS_over_TLS

CloudFlare supports it and we're using it as default, apparently it wasn't a great idea to have it as default on first-gen raspberry pi — we tested on third-gen, which handles that quite well.

👍🏻

Do you know how much CPU use AdGuard Home in a 3rd gen Raspberry Pi?

Thank you!

[hmage]

I'm doing a DNS request every 0.1 seconds via AdGuardHome, and as seen in top it utilizes only about 5% of CPU.

I do have dns-over-tls disabled, though.

[omata]

About CPU use it is using more than 4.5 times than pi-hole does. So, about the CPU load yours is lower than mine. I can say that Ad Guard Home statistics aren't bad. I will give a shoot again when it get more polished and open bugs fixed.

Thanks a lot!

[hmage]

I assume this issue can be closed.