Turns out the reason why the sqrt decomposition yesterday did not pass was due to a stupid array overrun. D'oh :P
#ICPC
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Edward Snowden @snowden
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--
Original: https://www.twitter.com/Piratenpartei/status/1237708457635205120
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Also, the key strap is pretty short, so it's kinda hard to open stuff with the keys still attached.
More info:
iptables rules:
```
-A FORWARD -i %i -j ACCEPT
-t nat -A POSTROUTING -o eth0 -j MASQUERADE
```
Using tcp_probe to see what Reno is doing (understood Reno the most so decided to poke at it first), cwnd seemed to be stagnant for no apparent reason, with no backoffs observed.
Reducing MSS seemed to reduce throughput quit significantly (though not exactly linear), so this may be somewhat packet constrained.
Still scratching my head...
This feels really trippy. Am running iperf3 over WireGuard.
client -> wg server : ok speed
wg server -> server : ok speed
client -> wg server (iptables forwarding) -> server : slow if using single TCP stream; UDP or 16 parallel streams work fine
client -> wg server (socat forwarding) -> server : ok speed
Also tried using SNAT instead of MASQUERADE and switching TCP CCAs, but to no avail.
Running iperf3 -B [wg address] on the wg server works fine.
#ICPC practice:
Contributed only some small ideas that did or did not work.
Only piece of code (160LOC sqrt decomposition; worse than the official solution) did not pass.
Really thankful for my teammates tolerating how much of a burden I am :(
#ICPC practice:
Teammate having "lunch" at 16:30
Interested in CS, IT, competitive programming, cubing, anime, and other nerdy stuff.
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