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I'm on a gigabit internet connection which fluctuates somewhat but it always stays at 700 Mb/s which means I expect at least 80 megabytes per second when downloading on Usenet. But I never get more than 42MB/s and during the night my speeds drop to around 12MB/s.
My setup:
Connected using an ethernet cable.
Downloading to an SSD.
Latest version of SABnzbd.
Gigabit internet service.
Docker container running on Synology NAS (also tried Windows binary on another host)
Already made sure no caps have been applied.
Things I've tried that didn't solve my problem:
Switching downloads to an NVMe ssd instead of hard drives.
Used a different SSL port
Switched SSL cipher to AES128
Tried a different host on a different OS and also could not get past 40MB/s
Tested my internet speed on the same host using a speed test container and my speeds are around 900 megabits per second
Tested with a Linux ISO torrent file using a torrent client that downloads to the same download folder as SABnzbd and was able to get at least 80MB/s
Checked CPU and disk utilization during a download and the utilization is low.
Tested a different Usenet provider.
Tested with the test download 10GB file when you click the wrench icon.
Wrench icon test results:
System performance (Pystone): 461851
Download folder speed 1112.5 MB/s
Complete folder speed 1128.7 MB/s
Internet Bandwidth 20.8 MB/s
Obviously, the internet bandwidth result is the bottleneck. But, as I explained, my internet connection works perfectly fine. Only SABnzbd seems to have a problem. If my bandwidth really was 20.8 MB/s I would not be able to download torrents at 80MB/s or get close to gigabit speeds with a speed test container.
I don't know what else to try or even how to debug this when the application itself thinks my bandwidth is lower than it actually is.
Edit:
Just tested the download speed after resetting my configuration as per the freshstart wiki section and it still didn't help.
Tested speeds while using a VPN and nothing improved either.
Last edited by anything6287 on May 23rd, 2023, 4:59 pm, edited 1 time in total.
> But I never get more than 42MB/s and during the night my speeds drop to around 12MB/s.
Assuming your NAS / device is not doing something special during the night, that means the cause must be something external to SABnzbd & NAS? Even something outside your local setup, so something at ISP level?
Here are the results for the VPN test. Thanks for your help btw.
SABnzbd internet bandwidth test before VPN
From a speedtest:
112MB/s
From the SABnzbd test:
14.3 MB/s
Speed from actual test file download (10GB):
43MB/s
Again, the actual SABnzbd download speed is different than the speed reported by the SABnzbd test. But both are lower than my actual internet bandwidth. The internet bandwidth test for SABnzbd seems pretty useless in my case.
After VPN
From a speed test:
65.33MB/s
From the SABnzbd test:
13.1MB/s
Speed from actual test file download (10GB):
24MB/s
A pretty big hit for using a VPN (even with WireGuard) but I still have the same issue. SABnzbd's download speeds under a VPN do not reach close to 60MB/s. It seems my ISP is not throttling. I guess the next step is to try NZBGet to rule out SABnzbd and report back.
NZBget did not improve the speeds. I also tried setting different server priorities for three different providers. Plus, I tested the speeds on a third machine with my ISP router since I was using an OPNsense router. I still got the same result.
Finally, I set an equal priority to my three different providers and the speeds jumped to about 52 MB/s. But this is still half of what my internet bandwidth allows.
I'm all out of ideas. I guess 45MB/s on average is what I should expect. Although I still don't understand why SABnzbd doesn't properly tell me my true internet bandwidth.
anything6287 wrote: ↑May 23rd, 2023, 9:16 pm
Although I still don't understand why SABnzbd doesn't properly tell me my true internet bandwidth.
That measurement is not perfect. We improved it with SAB 4.0.0, but still it's just an indication.
There are better tools to measure Internet speed from a system, but 1) they need external tools (like iperf3) and/or 2) they need sites other than sabnzbd.org (which might trigger questions from users / firewalls).
I see. Well, thanks for all your help and all the quick replies!
Unless I figure something out later I'll end this by saying I bit the bullet and subscribed to a fourth provider (Frugal Usenet). I read that some people got better speeds with Frugal and at least in my case that seemed to help. My speeds are now about 65 MB/s on average and a 79 MB/s maximum. Don't know if I'll observe the nightly slow-down but so far the speeds are better.
How many connections are you using for each server? Seems like you've tested almost everything. If you are using all the available connections then my last suspects are the router or the ISP. Speed test sites can give a false impression because ISPs almost always optimize those connections.
How many connections are you using for each server?
The maximum amount of connections. I started with 1 connection for Eweka and then tested with 5 connections, then 10, etc.. in increments of 5 until I reached 50 connections which gave me the best speeds. Then I just used 50 connections for Frugal.
If you are using all the available connections then my last suspects are the router or the ISP. Speed test sites can give a false impression because ISPs almost always optimize those connections.
I already tried two different routers including my ISP router. I did confirm I can download at 80MB/s or more using torrents so the internet speed test bandwidth doesn't seem misleading. I guess I can live with 70 MB/s instead of the >100MB/s I should normally get. Although, I do have to be more selective with providers to even get 70MB/s.
