I was just wondering why KTorrent downloads much slower when compared to Azureus. For instance, when i download something with Azureus the maximum download speed i have achieved so far was 510 KB/s while with KTorrent it is about 130-150 KB/s. Has this to do something with the settings of KTorrent or is Azureus just way better in downloading? As an example i tried to download the same movie, the one time using Azureus and the other time using KTorrent. I noticed that Azureus is much faster than KTorrent and it also connects to much more peers/seeders than KTorrent. The max download speed i could get from KTorrent on this movie was about 110 KB/s while i got 350 KB/s from Azureus. Any chances of improving the download speed of KTorrent to at least match 70 or 80% of Azureus?

Version ?

George wrote:Version ?

KTorrent 2.0.2
Azureus 2.5.0.0

Want kind of limits have you set ? If you have set an upload limit try increasing it and also increase the number of upload slots (Preferences dialog under downloads.

George wrote:Want kind of limits have you set ? If you have set an upload limit try increasing it and also increase the number of upload slots (Preferences dialog under downloads.

I don't have any upload limits set and I have 100 upload slots (the max allowed)

Wow man, 100 upload slots is way too much even for high-speed upload capacities...

First of all, set up upload speed limit to 80-85% of your real capacity (for example if you have 100KB/s upload speed you should set upload limit to 80-85KB/s) 'cause it can slow down your downloads otherwise.

As for the upload slots, you should experiment to see what gives the best results (but more like between 4 and 10 upload slots). Think of it like this: if you upload at your maximum, say 50KB/s, and have 100 upload slots then each peer will get 0.5KB/s (ideally) which is very wrong. But if you have, say 5 upload slots then each peer will get 10KB/s which is much better.....

ok i followed your sugestions and it looks better now on the uploading side but the download side is when compared to Azureus much lower. I think that Azureus is better in downloading than KTorrent no matter how often i play with the settings of KTorrent, Azureus always beats it in downloading, sorry

Post some torrents which show a significant difference in download speed between KT and AZ.

Ivan sent me one where AZ was getting a lot more peers then KT, but when I tested it KT and AZ got about the same amount of peers and KT was usually getting slightly better download speeds.

well I have one but where to post it?

microchip wrote:well I have one but where to post it?

Send e-mail to :
joris DOT guisson AT gmail DOT com
or
joris AT ktorrent DOT org

Or just post a link to it

George,

I, too, sometimes experience the same problem, KTorrent 2.0.2 under Ubuntu Edgy / i386 -- namely, on some torrents I notice KTorrent is considerably slower than rtorrent or Azureus.


http://www.isohunt.com/download/6605422/mythbusters

This is one torrent just as an example that I this problem in a reproducable fashion. KTorrent downloads at around 10-20KB/s, taking around a minute of being Stalled to connect to enough peers to get to that speed... Azureus immediately gets around 30-40KB/s, and after leaving it running for 5 minutes, it was in the 100KB/s range. KTorrent continues flickering in the 10-20KB/s, sometimes down to 0, range.


This does not seem to happen on all torrents though; I was happily torrenting the Fedora Core 6 Test 3 DVD the other day, and KTorrent was performing just as good as Azureus.

We are currently looking at the problem. But this torrent in question seems to have lots of trackers, and most are not really responding.

Thanks for looking into it!

It seems to me like KTorrent is working past the tracker obstacle pretty well; within a few attempts it's able to get 50 seeds and an equal number of peers. It can do it even faster if a user assists KTorrent via the Change Tracker button.

This is not a tracker problem from what I could tell be reading the code. It looks to me like there is a hard coded feature that throttles the download to 3-4x SLOWER than the current upload rate UNTIL it hits 20%. Why this is like that without them telling anyone is beyond me. This is the reason why your downloads are CONSISTANTELY SLOWER than azureus.

Once your torrents hit 20% (like 5 days later if you're anything like me downloading Multi GB debian torrents), then things get a little better. At that point it seems to even out the upload/download rate (Which in my opinion is still morally wrong).

I believe the rate should NOT be limited at all. This is also part of the reason why the upload/download rate feature almost never works correctly.

It looks to me like there is a hard coded feature that throttles the download to 3-4x SLOWER than the current upload rate UNTIL it hits 20%. Why this is like that without them telling anyone is beyond me. This is the reason why your downloads are CONSISTANTELY SLOWER than azureus.

???

May I ask what are you talking about? What hardcoded feature? Could you, please, point out that part of the code? Or, even better, could you fix it to match azureus download speed?