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I have set an upload limit of 30kB/s, but sometimes it is uploading 100kB/s. I have tested uTorrent and BitTorrent and they have the same problem. I disabled the setting "use more upload slot if upload < 90%". I have set 30kB/s limit both in the current torrent preferences and in the general preferences.

Why does it still use more bandwidth?

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Are you sure you're not just confusing kilobytes and kilobits? – Daniel Beck Feb 22 '11 at 18:17
On the other hand, 30kB/s = 180kb/s. – Olli Feb 22 '11 at 19:00
30kB = 240 kilobits, actually. @Olli – oKtosiTe Feb 22 '11 at 19:14
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@oKtosiTe: well, simple multiplications are so hard. And yes, true. – Olli Feb 22 '11 at 19:16
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4 Answers

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Check if the upload is going to a peer on your local network.

utorrent, for some reason does not limit the upload rate to local peers, even if a global upload rate limit is set

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Good point. Some providers even distribute Class C addresses to their client, so that might be something to check. – oKtosiTe Feb 22 '11 at 19:23
What do you mean by local network? My ISP acutually uses NAT so do you mean every other poeple with my same ISP? Other than that I don't have any LAN here – yes123 Feb 22 '11 at 19:27
@yes123: I have seen ISP's that give out addresses in the 10.0.0.0 and 192.0.0.0 address ranges. If they do, uTorrent might confuse other users of the same provider with local clients. This is very hypothetical, though. – oKtosiTe Feb 22 '11 at 19:30
@oktosite: hm yes, my isp does give those ip to their clients (behind the nat) (I believe every ISP that uses NAT does it) So the dumb bittorrent thinks it's itnernal traffic and doens't limit it =/ doh =/ – yes123 Feb 22 '11 at 19:36
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If your router gives you a Class C address, that's a whole different story. I'm talking about the situation where people outside of the network behind your router/modem/outlet would also be represented with 10.0.0.0 or 192.0.0.0 addresses. If they're not, then my comments can be ignored. You can check for this on the "Peers" tab in uTorrent. (Disable "Resolve IPs" by right-clicking there.) @yes123 – oKtosiTe Feb 22 '11 at 19:43
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up vote 1 down vote

As Daniel suggested, you may confuse kilobytes and kilobits. At least in uTorrent speed is set using kilobytes per second (kB/s).

One kilobyte is 8 kilobits, so 30kB is ~240kb/s. It might be 100kb/s, if there isn't many people downloading it, or if your network connection limits it to slower speed.

Another possibilities are bug in both uTorrent and Bittorrent. Or protocol overhead is really high for some reason. Or finally, if your bandwidth monitor bugs for some reason.

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I don't think uTorrent displays kbit/s anywhere. – oKtosiTe Feb 22 '11 at 19:16
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up vote 0 down vote

This is a related issue, but if you're in a situation where you want to limit upload or background bandwidth used one important consideration here is the number of simultaneous connections. You might find you get down to just 30kB/s just fine, but still have issues with your actually throughput because that 30kB/s is divided among 500 or more active connections to different peers. In this case, sometimes a router or modem just won't handle it very well, or it becomes a flag that your isp uses to start traffic shaping or throttling on your connection.

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Be sure that Apply rate limit to uTP connections is checked in your settings

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