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Unbearable lagging when playing Duke3D over PPTP #11

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fragglet opened this issue Sep 11, 2021 · 0 comments
Open

Unbearable lagging when playing Duke3D over PPTP #11

fragglet opened this issue Sep 11, 2021 · 0 comments

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@fragglet
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Report by TheBaratusII:

https://youtu.be/K9xkIxuc6dc

The bug is at 27:19
The PPTP connection lagged the game really hard

fraggle — 08/09/2021
PPTP as well?
THEBaratusII — 08/09/2021
KAAN was on DOSBox and ZNukem was either on DOSBox or PPTP
fragglet added a commit that referenced this issue Feb 23, 2022
@fragglet
Use a single raw socket for receiving PPTP datagrams.
b6d1562 
Instead of creating a new raw socket for every new PPTP session, just
multiplex all sessions over a single socket.

I put this change together intending it as a solution to #11 but from
my experiments it appeared that it did not solve the problem, since
Linux appears to deliver raw packets to the receive queues of all raw
sockets bound to a particular protocol.

However, there are still a couple of advantages to this change. Firstly,
it should be more efficient as packets only get received a single time.
Secondly, it means that the GRE server is established on startup,
meaning that any problems with eg. permission errors will be made
apparent on startup, rather than becoming a hard-to-debug error when a
user tries to connect.
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