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bbqsquirrel

1000 mbit to 30 mbit on Synology DSM 7

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I have fiber connection with ATT&T with 1 gbps up and down. I have setup VPN on my Synology DSM 7 using this guide With the VPN turned OFF, speedtests via speedtest.net are in the 800-900 mbps range. With VPN turned ON, it drops to 30-40 mbps. I've tried connecting to a few different servers (including Merope LA and Vulpecula Dallas) with similar results. what gives? this can't be normal right?

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4 hours ago, go558a83nk said:

It's probably a bottleneck on your CPU but without knowing what the CPU is in the device I can't say for sure.

Hmm it's a DS920+ which has a Intel Celeron J4125. To further complicate the issue, the VPN is on a DSM7 virtual machine on the DS920+.

Is there any other way I can setup Synology NAS behind the VPN that will minimize the CPU impact?

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54 minutes ago, bbqsquirrel said:

the VPN is on a DSM7 virtual machine on the DS920+.


That's probably the principle issue. Unsure if you've given the VM 100% of the CPU, or if the overhead is way too high for performance things.

I skimmed through the linked guide but didn't find anything related to "make a VM and do OpenVPN in it". Did you really follow only that guide? Because it tells you specifically to import the config in Synology's WebUI.

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That CPU does have AES-NI which is important for good speeds with openvpn.  But running it in a VM may keep AES-NI from getting used?  I don't know.

You could try to use the chacha20 data cipher option that AirVPN supports if your client supports it.  It's usually faster on weaker devices.

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1 hour ago, OpenSourcerer said:

That's probably the principle issue. Unsure if you've given the VM 100% of the CPU, or if the overhead is way too high for performance things.

I skimmed through the linked guide but didn't find anything related to "make a VM and do OpenVPN in it". Did you really follow only that guide? Because it tells you specifically to import the config in Synology's WebUI.

 

Yes, that's the guide I followed to the t with the exception of doing so inside a VM. I only wanna VPN the VM for various reasons

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1 hour ago, go558a83nk said:

That CPU does have AES-NI which is important for good speeds with openvpn.  But running it in a VM may keep AES-NI from getting used?  I don't know.

You could try to use the chacha20 data cipher option that AirVPN supports if your client supports it.  It's usually faster on weaker devices.


chacha cipher was a great suggestion. boosted me to 60mbps down and 90mbps up. I'll have to do a deeper dive into the AES-NI thing, a quick google search didn't turn up anything useful. I'll also try throwing more "cores" at the VM. 

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