Increase default Tor buffer sizes on Windows
In #22798 (moved), a Windows relay operator discovered that setting
ConstrainedSockSize 262144made inbound connections to their relay much faster. (Outbound connections are fast regardless.)
They suspect this is because Tor's networking calls turn Windows buffer auto-tuning off.
We should improve this default, because it will help Windows relays be faster. (It shouldn't affect Windows clients, because they only connect out.)
This might be an issue in Tor, or it might be in mingw-64.
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