Posted 04 October 2010 - 12:57 AM
In all likelyhood both the local wired and wireless connections are much faster than your Internet access connection, so that is where the bottleneck will happen if your demand exceeds supply of bandwidth. BitTorrent is specifically designed to maximize throughput and will always create a demand that slightly exceeds supply unless you specifically configure it otherwise. If there is a torrent in the house everyone else will feel it. Due to the internal design of most home routers the wireless users share the equivalent of one port on the wired switch, so that adds a potential second bottleneck and point of contention, but it's much faster than most folks' internet connection and as such not usually a big impact, but it will result in lower throughput for wireless vs wired users if there is queuing at the switch chip, which there will be with torrents running. The best workaround is to configure your torrent client to use a maximum of about 2/3 of your available internet bandwidth. This should reduce the queues for everyone else enough to get reasonable response and throughput at the cost of taking a bit longer to download the evening's entertainment.
Try going to www.pingtest.net and running a test with and without torrents running on the other computer. If you get higher packet loss with the torrent running you are way overloading the link. If it's just higher latency and jitter you are close. How much higher latency and jitter you have can be adjusted - by throttling the torrents.
Some modern routers are QOS aware and can assign priority service to one or more devices. Set your torrent user to lowest priority and it should help and still give pretty high throughput for torrents.