this post was submitted on 22 Jul 2023

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Tailscale with zero clients connected takes 7% of CPU time: is this normal? (feddit.it)

submitted 11 months ago by [email protected] to c/selfhosted

15 comments fedilink hide all child comments

I tried to delete and recreate the container, but there's still this insane power consumption.

For comparison, cloudflared doing a tunnel to hundreds of users takes 0.06% of CPU time on the same server

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[–] [email protected] 9 points 11 months ago (1 children)

On my machine it's consuming about 0.5% - 1.0% of cpu time, which is higher than zerotier in the same machine (almost zero).

Tailscale does a lot more things than just tunneling though. For example, on default installation it'll catch all outbound dns request on the machine and route them through MagicDNS (100.100.100.100).

[–] [email protected] 6 points 11 months ago* (last edited 11 months ago) (4 children)

That's weird. I closed the docker on that specific machine (ryzen 5), copied the docker-compose directory (=same config) on an i5-6500T and now it's using just 0.1% of CPU time.

Go back to ryzen and it's 8% again 🤷

[–] [email protected] 5 points 11 months ago

I just checked my AMD box and tailscale there can consume ~15% of cpu time when the tunnel is under active use. When it's not used it's ~1.5%. But it's a low power old AMD cpu though (AMD G-T56N), so I'm not use if it compares to Ryzen 5. On my intel machine, it's ~5% when under active use, and idle at ~0.5%.

[–] [email protected] 3 points 11 months ago

One thing you could try doing if you feel up to it is to build Tailscale from source code. Often when built for your specific machine, performance improves.

[–] [email protected] 2 points 11 months ago* (last edited 11 months ago)

I use tailscale on my Ruzen system, and it always stays under 1% usage. Usually below 0.5%.

[–] [email protected] 1 points 11 months ago

Isn't CPU % is per thread?

[–] [email protected] 7 points 11 months ago* (last edited 11 months ago) (1 children)

Why is your system load >5 with such little CPU usage? Seems like there is a lot of i/o on your system.

If it's network traffic going over your VPN that could explain it.

[–] [email protected] 6 points 11 months ago (1 children)

Because that's a docker container on a "busy" server (mostly WordPress wasting cycles generating pages for some bots that really have to visit my blog over and over and over and over)

(Top from inside the container)

[–] [email protected] 2 points 11 months ago (1 children)

you might want to look into getting wordpress to generate static pages and only deliver the static html.

Overall using bloging tools that generate static pages is better than constantly requesting DB and dynamically compiling each page every time there is a request

[–] [email protected] 1 points 11 months ago

Yeah it's a long time that I wanted to migrate to Hugo

The main issue is that a decade ago or so, I hosted a vibrant forum with the stupidest platform ever, bbpress. So my WordPress has something like 30k pages...

[–] [email protected] 1 points 11 months ago

time to do some perf profiling

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