2G/3G latency for FPS/TPS

Unduli · 2015-07-22T15:22:56

Hello there, I was very optimistic and happy with naiveish implementation of multiplayer for a 3rd person shooter relying on low byte of data to transmit. But after I noticed that ( @ http://chimera.labs.oreilly.com/books/1230000000545/ch07.html#_brief_history_of_the_g_8217_s ) there is serious latency at 2G and 3G connections ( just for the records, ignorance is bliss indeed ) In this case, is trying to have a FPS/TPS game that can be played at mobile networks already a lost cause without writing single line of code? If that's so , apparently choices are making game WiFi viable only or change gameplay completely. Thanks in advance.

Networking and Multiplayer Programming

Started by Unduli July 18, 2015 06:24 PM

9 comments, last by hplus0603 8 years, 9 months ago

samoth

9,833

July 22, 2015 09:49 AM

Yes, you will have higher latency using a cell phone network. It is still low enough latency that with a bit of creativity you can work around it.

I just tried pinging and tracerouting a nearby server (connected to the university backbone) from home because I couldn't believe those numbers (as in, way too high) over 4G. Turns out that <100ms for 4G is indeed optimistic.

Pinging that machine "via cable" (10G ethernet plugged into an ADSL2+ router) gives 22 +/- 1 ms (of which about 20ms is for going through ATM, the 3 hops via DECIX to the target server take an entire 2ms alltogether).
Doing the same via WiFi (802.11n, provided by the router) gives me ping times of 25 +/- 1 ms.
Doing it via "personal hotspot" on an iPhone connected via 4G (LTE) -- tried 3 times with 20 probes each -- gives... 130ms best, average around 200ms, and worst 1480ms.

Traceroute doesn't work via 4G at all, apparently Telekom is filtering these out.

hplus0603

11,916

July 22, 2015 03:22 PM

Try the "-U" option for traceroute (assuming you're on Linux.) It will do a UDP trace-route on port 53 (DNS) which is unlikely to be filtered by your ISP. Although the return ICMP "port not reachable" advisory packet may still be filtered.

enum Bool { True, False, FileNotFound };

2G/3G latency for FPS/TPS

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2G/3G latency for FPS/TPS

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