On Sun, 10 Apr 2016 17:52:20 +0000 fr33d0m4all fr33d0m4all@riseup.net wrote:
I've just moved my Tor relay installation from my alix1.c embedded system (500Mhz CPU with 256Mb ram) which was able to offer only 4Mbps (100% CPU utilization) to a new Raspberry Pi3 (quad-core 1.2Ghz 64-bit cpu with 1 GB ram). Some days ago I've seen some messages on the ML about Pi2 performance (if I remember well) and I'd like to share my first experiences with Pi3. I have only 20Mbps connection in the uplink direction, so I'm offering about 15Mbps for Tor relay and I've just seen that it is able to offer 14Mbps with 40% of a single core utilization.. In conclusion, I think that a single relay on Pi3 can offer about 30-40 Mbps, and if you run 4 tor relays on the same Pi3 you can offer more than 100Mbps which is definitely not bad for such a small system. The only drawback is that you need to find a good way for keeping it cold, since after 1 hour of 1 core at 100% I've reached about 70°C with heatsinks on the CPU.
If you build tor against OpenSSL 1.1 on that target you will get a massive increase in performance due to support for the ARMv8 hardware AES acceleration.
This requires 0.2.8.x from the maint-028 branch (or master if you're brave) since I recently fixed tor (again) to compile with this version of the library, but the changes will be in the next 0.2.8 release candidate.
Regards,