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Slow sab tips? (lemmy.world)

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

7 comments fedilink hide all child comments

I recently moved from a non docker ubuntu 18.04 setup to a full docker 22.04 setup. I used to get a pretty consistent 95-105 MB/s in sab. I can't seem to get more than 70 MB/s in my new setup. Both my usenet providers are setup the same and using 50 connections. I'd love to blame docker, but thought i see if anyone here has seen this as well. Any suggestions on what to look at?

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[–] [email protected] 3 points 11 months ago (1 children)

One thing I found when testing.my settings was reducing the number of connections can cause better results. Is the speed your getting through the test button or actual downloads? The test also tests other things for the bottleneck so maybe something else is being the bottleneck like disk speeds.

[–] [email protected] 2 points 11 months ago

Actual downloads going to the same storage array as the previous system. Same NFS lun even. I'll try the test button and playing with the number of connections. Thanks! Will report back.

[–] [email protected] 3 points 11 months ago (2 children)

This could be the I/O overhead caused by docker while using NAT networking: https://stackoverflow.com/questions/21889053/what-is-the-runtime-performance-cost-of-a-docker-container#26149994

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

The article your linked is citing a paper from 2014. Seems hard the believe the network stack hasn't been significantly reworked in 10 years. That being said I don't have anything to refute this.

Does the above still apply if using a glutun VPN docker with other containers connecting directly to glutun?

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

That's a large penalty, wow.

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

It's huge for networking. VPN gateway (for accessing the VPN WAN over LAN) on the host is 20-40% faster than dockerized...

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

I'm using NAT for sure. All my containers are on a different subnet than the host.