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Torrents and pings

post #1 of 9
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I have never understood why torrents cause such high pings and lag for all other programs while active. I can be downloading a torrent at 100kbps, a fraction of my connection speed to my ISP, and it will cause the pings of other applications/games to go through the roof.

Does anyone know what exactly causes this and if it can be fixed?
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post #2 of 9
It doesnt matter how many torrents you are downloading, the torrent client has to constantly manage connection with all the seeds and peers related to every single torrent. So, even in the case of a single torrent, total number of pings sent from and to your computer is too much. That is why it causes other similar connections (multiplayer games where the game has to keep connection with the other players) to experience higher latency. As far as I know, there is now way of fixing this. In win Xp one had to manually increase the number of allowed half open tcp ports, but in win 7 it is not an issue any more.
    
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post #3 of 9
This is often an issue with crappy home routers. It can't handle the number of connections and/or lacks WAN to LAN throughput.
post #4 of 9
Pretty much that last post.

You can easily blow up the NAT table on consumer home routers and either peg the CPU or RAM simply by the amount of translations opened. For every connection behind your home router, your router must keep track of 4 sets of addresses as your entire LAN is sharing one external IP.
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post #5 of 9
This happens with my crappy Netgear, after a file is done, I have to hard-reset it to get ANY functionality from it. Next purchase: Switch.
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post #6 of 9
My DGN2000 can handle it ok. I can download 5 torrents at once before my pings increase (500KB a sec download cap)
post #7 of 9
Keep in mind also once you saturate your WAN bandwidth your pings will skyrocket as well.
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post #8 of 9
Flashing your Router to DDWRT and managing theses settings manually will help mitigate your problems
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post #9 of 9
Alot of it has to do with Upload saturation too. Keep an eye on your upload rate and maybe limit it to half of your rated upload speed.
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