Windows relay is several times slower than Linux relay

I have launched two relays: first one in native mode on Windows, second one in virtual machine on Linux.

Then measured their bandwidth using three-hop circuit: refEntry, myRelay, refExit refEntry is [[https://atlas.torproject.org/#details/13B2354C74CCE29815B4E1F692F2F0E86C7F13DD|13B2354C74CCE29815B4E1F692F2F0E86C7F13DD]] refExit is [[https://atlas.torproject.org/#details/07C05ED4825F51D5BE4CDBBAA80BFA484132A2F5|07C05ED4825F51D5BE4CDBBAA80BFA484132A2F5]]

Windows version of Tor was able to provide 51 KiB/s. Linux version - 163 KiB/s, which is three times higher.

But this was my measurements. BwAuth ratings for this relays are far more different: Windows one have weight = 18 (19/13/22/18). Linux one got weight = 1030 (293/1030/1460).

Which leads to actual traffic rising from 1 KiB/s to ~500 KiB/s.

I can keep relay in virtual machine for a while, but it would be much better if Windows version gets fixed.

Here are the versions of software used in tests: OS: Windows 7 SP1 x64 (host) OS: Ubuntu 16.04 x64 (guest) VM: VirtualBox 5.1.22 Tor: 0.2.9.11 (Linux) Tor: 0.2.9.11, 0.3.0.8 (Windows)

Also I have obtained TCP packets dump from relay's network interface: (REDACTED)

Packets 1-1584 are slow transfer (Windows relay). Packets 1585-8659 are fast transfer (Linux VM relay).

I can made additional tests and provide additional information if needed.

Trac:
Username: Vort