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I read all documentation and FAQ at Tor project website, but cant find obvious information about "System requirements of Tor Relay" except bandwidth...

For example, I would like run a relay tor node for about "60-80Mbit/s" total bandwidth so I want to know what power the processor and RAM should I use. How many core(-s), GHz, MBytes of RAM for server that will be able to push 60-80Mbit/s? Approximately? Please share your experience.

Regards

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  • ovh.com/us/vps/vps-ssd.xml I use VPS SSD 1 and it works perfectly, never crashed. And it's not using 100% of CPU or RAM. The fact that it's and SSD is irrelevant.
    – user3524
    Jun 19, 2016 at 14:17

4 Answers 4

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I just stumbled over a mailing list that exactly treated this issue.

How to Run High Capacity Tor Relays

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My setup for my Tor Relay is a Raspberry PI1. It has a Minibian (with not much packages) on it and I configured it with ~360MB of RAM for the Tor relay. My Bandwith is about 1Mbit.

Hope I could help you.

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Many thanks for your reply. My goal is calculate system requirements for 60-80 Mbit per second (Or so).

I have experience with RPi, and it is too low bandwidth through them, cuz they have weak processor. That why I would like start my new relay on dedicated server with more bandwidth, but idk which configuration server should I buy (Just cheap home PC).

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  • please take a look at my answer update
    – Alexey Vesnin ♦
    Mar 28, 2016 at 19:05
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Raspberry Pi is handling it Fine. The main requrement for Linux-based relay is the very last mainline kernel from kernel.org's Git and properly configured + Tor libraries compiled with -mtune=native, the libraries are :

  • OpenSSL - official git repo is here
  • libevent - official GitHub repo here

UPDATE: Of course, RPi won't give you 60-80Mbit/s, You will need a motherboard with two ethernet interfaces already on board(for a case of personal privacy router), or - for a "minimal requirement" - PCI-E v3 and a very good server NIC, like this or similar : the cheap NIC for WAN/Internet will make an interrupt storm and steal your CPU power. RAM is about to be as fast as hell, but you need just 1-2 Gigabytes - in case of tor you will never have a need in the big amount of memory! Do not use single module - don't forget a dual-channel mode benefits! So 2 modules of AMD Radeon DDR3-2400 will be just fine. CPU must have AES hardware acceleration and a good clock speed : Tor's single-core crypto nowdays is a problem, so I do recommend a 2-core CPU with the highest clock and FSB speed. Storage does not matter at all - you can easily utilize a zram/zswap and tmpfs for all the things your relay will ever need, booting from a read-only flash memory. For a hardware spec proposal:

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  • Are you sure about Mbytes, not MBytes? Look like too strong conf.
    – Kilos Noodlas
    Mar 29, 2016 at 12:46
  • @KilosNoodlas you can take dualcore CPU but 4GHz+ is strongly recomended : after 15-20 you will see a bottleneck in single-core crypto, so the FSB+Ram speed+Core clock will play a significant role.
    – Alexey Vesnin ♦
    Mar 29, 2016 at 13:22

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