Asymmetrical OpenVPN speeds on symmetrical Gigabit service
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I've been racking my brains over this for a while and finally decided that I'd gotten as far as I was going to be able to with Google-Fu and my own two remaining brain cells... and that letting go of my sense of pride and asking for help would be the wisest choice, so:
I'm running pfSense on a dedicated box with an Intel Pentium CPU G4400 (3.30GHz), 8 GB of RAM, and an Intel PRO/1000 PT Dual Port Server Adapter card at home. My ISP is Sonic (I'm in the US), but the actual connection is through AT&T, so I like connecting to Sonic through their own OpenVPN server in order to maintain some semblance of privacy.
Now, when I run a speed test from a desktop computer in my LAN without the OpenVPN connection, I pretty much get symmetrical speeds that are virtually 1 Gbps. Needless to say, I expected the speeds to be lower when running the OpenVPN connection, but what I don't get is the following: With OpenVPN, the download speed is around 350 Mbps and the upload speed is around 150 Mbps. I have no clue why this is happening, i.e., why they're asymmetrical. Anyone have any idea?
Relevant details:
Traffic shaping is completely disabled
AES-NI is enabled
Hardware Crypto is set to None
NCP algorithms: AES-256-GCM and AES-128-GCM
UDP Fast I/O is enabled
Playing with the Send/Receive Buffer has not made much of a difference
I've added the net.inet.ip.fastforwarding tunable and set it to 1I'll be more than happy to do any testing required, but I'll be honest and say that the testing stuff is pretty new to me, so please be patient if I ask dumb questions - I want to make sure I get you the information you need instead of wasting your time!
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Maybe the sonic server can only receive 150 but can send 350?
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That... uuuuuhhh... would actually make a lot of sense. I'll go ahead and ask them, thanks!
