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I have problems with seeding with everything different than Transmission under Linux.
I was using qBittorrent  before 1 year and the download speed seems normal until i try to downloaded torrent with Transmission which speed was double .Now that problem is gone, qBittorrent download speed is 4,7-5MB/s (I pay for 40Mbps Download and 12Mbps Upload) but the upload speed is too low, around 20-160KB/s compared to Transmission  with 1.4MB/s upload.
I have 4 computers with various distros, Transmission just work and give me max speed without any configuration, I tried Deluge,Tixati,Ktorrent,rutorrent... but without luck, they give me good download speed but low upload.
So I  start to think that i need to configure qBittorrent.Can you help me to do that?I was reading many articles how to configure qb but nothing helps.
My distro is Manjaro OpenRC (Arch based) but have computers with pure Arch and Void Linux.
qBittorrent 3.2.1 on my main PC and 3.2.3 on the PC with Void Linux.All distros are 64bit.
Any help will be welcome!

EDIT:  03/08/2016
After a month of non-stop working with the latest version of qBittorent (3.3.3), I can say that it's working perfectly.
I do not know what make it work( it should be the update), but I want to thank to the developers for the great torrent client they make.

I have problems with seeding with everything different than Transmission under Linux.

Then use Transmission for your uploading,  because the common denominator of the 'problem' clients is libtorrent, or variants of libtorrent.

Are you using private trackers?
Are there LOTS of peers relative to the seeds on the torrent/s in question? (very hard to upload otherwise)

Are you using a VPN or proxy? (if so, what kind?)
Are you using uTP connections? (port forwarding your router/s for that also?)

Yes, I use some private trackers but i have many torrents where i am the only seeder and have around 10-15 leechers.qBittorent do not connect to those leechers but if connects the upload speed is very low(around 20-170).I experimenting with Deluge and qBittorent from 1-2 years, just try every new version to see if my problem is solved ,and in the new versions have a huge improvement in download speeds.There was one old version that working for me but afret upgrade these torrent clients newer had good performance.So i thing the reason is not qBittorent but Libtorrent and the reason Transmission to give me better speeds is that it use libtransmission.
I will wait new version of Libtorrent and will try again but for now will stick to Transmission like @ciaobaby said.
Thank you for the response!
@Switeck
I do not use VPN nor proxy, my port is forwarded.
I tried with uTP enabled or disabled but there was no difference.After disabling rate limit to uTP connections and rate limit to transport overhead just get better download speed.

[quote="x108"]i have many torrents where i am the only seeder and have around 10-15 leechers.qBittorent do not connect to those leechers but if connects the upload speed is very low(around 20-170).[/quote]That qBitTorrent is failing to connect to the peers on those torrents suggests networking problems on your end especially if Transmission has no problem. A software firewall may be allowing Transmission to get incoming connections but usually blocking qBitTorrent from doing so. Or port forwarding on your router may be messed up somehow. Many routers will NOT manually forward correctly to dynamic LAN ips! UPnP auto-forwarding can even conflict with manually forwarded ports. So you can try disabling UPnP in qBT if you manually forwarded.

While I cannot rule out that qBitTorrent is seriously buggy about connecting and staying connected to peers, you should be able to see if it's at least trying to connect to peers by stopping+restarting a torrent and watching the peers window. It should at least try to connect to some of the "hidden" peers in a minute of starting. If it's not, is the tracker/s working correctly on that torrent?

I tried different routers,computers, IPS's, and I am sure that my router is configured properly.Tried with UPnP  enabled and disabled but noting was changed.
I Have 3 PC's and one laptop.I take the laptop and go to my friends house to see what will be the speed, he uses PPPoE so i just connect the cable with the laptop the result was the same, I get good download speed 10MB/s  but low upload, around 1.2MB compared to Transmission with 11-12MB/s download and 5MB/s Upload.He pay  for 100Mbps Down and 45Mbps Up.qBittorrent "connection status" icon is green.I  Tried Deluge and ruTorrent also, they show me that the port is open but have low Up speed.

I remember when i was using Ubuntu 10.04 or 10.10 with with the same laptop(now with Arch 32bit) and one PC with 64bit Athlon the speeds in Deluge and qBittorent was identical with Transmission(then transmission was just for backup), I was also paying for 100Mbps Down and 50Mps Up and the speeds was 11MB/s Down and 4-5MB/s Up  around 2013 I installed Ubuntu 12.04 and after one update of Deluge and qBittorrent I noticed drastic reduction in the speeds so i switched to Transmission(in that time it was default torrent client).Since then I cannot get them working(should be the configuration or Libtorrent).

While I cannot rule out that qBitTorrent is seriously buggy about connecting and staying connected to peers, you should be able to see if it's at least trying to connect to peers by stopping+restarting a torrent and watching the peers window. It should at least try to connect to some of the "hidden" peers in a minute of starting. If it's not, is the tracker/s working correctly on that torrent?

I see many peers in "peers" section but qBittorent  do not connect to them, if connects the upload speed is low.Such behavior I see when I am only seeder and have peers trying to connect to me but they cant, then i just I run Transmission on one of the other computers where have the same torrent and they start to connect to me after 1-2 minutes.
Can this be some problem with Linux version of Libtorrent?
I will go to that friend again and will install qBittorrent on his copmuter(he use Windows 7 and Ubuntu) just to see what the speed will be compared to uTorrent and the linux version of qB.

Of course I can use Transmission but I really like qBittorrent , it's seems very handy and practical for me and make handling  of 600-700 torrents easy , and see that the developers are doing good work and adding many features.
Please excuse my bad English !

I Have 3 PC's and one laptop.

All using different ports for the torrent clients?

I use torrent clients only on my main PC and the laptop(i do not use it often), but I tried how qB wil work with the other two PC's(no difference), they are something like file servers and I use them because do not have free SATA ports for all my HDD's on my PC which i use for work.
The ports are different.Is that wrong?I was thinking  that they should use different ports to avoid conflict or something like that.

This is the hardware I use(don't know if that matters)
My main PC
MB- Asrock H97 pro 4 |  CPU Xeon e3-1231v3 | 8GB RAM  using the intecrated NIC 100/1000Mbps  the driver is e1000e
The laptop  is old Compaq nc6220, using the integrated NIC with driver tg3
Router Tp link wr740n v4 with Openwrt and  PPPoE.I tried to connect to internet  without router, just my IPS cable to the computer and configured PPPoE with Network-Manager(no difference).If you think that the router is problem I can try with other router with other firmware. I have two unused linksys wrt54gl one is with stock firmware the other is with dd-wrt.
Can this be related to my IPS?I am sure that they do not block torrent clients traffic.

[quote="x108"]I see many peers in "peers" section but qBittorent  do not connect to them, if connects the upload speed is low.Such behavior I see when I am only seeder and have peers trying to connect to me but they cant, then i just I run Transmission on one of the other computers where have the same torrent and they start to connect to me after 1-2 minutes.
Can this be some problem with Linux version of Libtorrent?
I will go to that friend again and will install qBittorrent on his copmuter(he use Windows 7 and Ubuntu) just to see what the speed will be compared to uTorrent and the linux version of qB.[/quote]Sounds like peers connect relatively slowly...though this may be due to you having many other torrents started/active.

As for being problems with Linux version of Libtorrent and qBittorrent, doing a quick test or 2 on your friend's computer should help eliminate that as a likely issue.
I wouldn't be surprised if uTorrent is faster (at least in Win 7) than Transmission or qBitTorrent, but even it has configuration issues -- so run its speed setup and use conservative settings.

The ports are different.Is that wrong?I was thinking  that they should use different ports to avoid conflict or something like that.

Nope it is correct as is your thinking on the matter.

Are you using uTP connections? (port forwarding your router/s for that also?)

You are confusing uTP with UDP.
uTorrent transport protocol (uTP) is a Transport Protocol that works on top of UDP (User Datagram Protocol)  to provide some measure of 'congestion' control, and it is UDP not uTP that requires a port to be forwarded through the router's Network Address Translation (NAT) system.

[quote="ciaobaby"]You are confusing uTP with UDP.[/quote]No I'm not, I just forgot to clarify.

uTorrent has NAT hole-punching ability with uTP, but even in its case it works MUCH better to port forward UDP for uTP and TCP for regular peer/seed connections.