I installed a private relay on VPS to avoid using traffic from the public relays. It works great however I have bee noticing that the relay speed is maxing out at around 575 KiB/s. This is surprising to me because I know my server (debian) can handle a lot more.
I am trying to figure out where the bottleneck is and I can’t figure it out. I checked the CPU usage (only about 4%), bandwidth, I have a 500Mbps fibre line and the relay is in a data center with plenty of capacity, not IO either. The relay limit is much higher but even if I remove the limit I am still seeing this 575KiB/s barrier. The relay and its also not on a public pool.
Any ideas what causes this limitation in the relay server? Is there a theoretical maximum speed a relay can handle? It can’t be this low.
I noticed that when the relay starts there is a:
Jul 11 02:35:26 localhost strelaysrv: 2020/07/11 02:35:26 main.go:144: Connection limit 419430
I think that just refers to the number of connections it can handle not transfer speeds.
Here is the startup line for the relay (actual address redacted)
/usr/bin/strelaysrv -pools= -ext-address=XXXX.XXX:22067 -global-rate=6000000 -per-session-rate=6000000