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qBittorrent => Windows => Topic started by: mgillard1976 on June 08, 2019, 02:26:35 pm

Title: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: mgillard1976 on June 08, 2019, 02:26:35 pm
If I uninstall QBT and reinstall it goes back to normal with good steady DL speeds. After a couple days the same thing happens again.

I've tried:

The only thing that works is to uninstall and reinstall. Then I'm good for a day or two.

Windows 10 64 bit
QB version 4.1.6
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: Switeck on June 08, 2019, 09:48:20 pm
In those "couple days", are you downloading like 10+ torrents and/or over 10 GB of torrents?
If so, you could be stumbling across qBitTorrent's problems with torrent queuing or upload slot handling or even upload speed overloads (which can cause exponential download speed die-offs).
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: mgillard1976 on June 09, 2019, 01:42:11 am
In those "couple days", are you downloading like 10+ torrents and/or over 10 GB of torrents?
If so, you could be stumbling across qBitTorrent's problems with torrent queuing or upload slot handling or even upload speed overloads (which can cause exponential download speed die-offs).

I have less than 10 torrents seeding. It's possible I went over 10 at some point but the last time it was definitely less. I'll search through the forums using those keywords though. Is there a solution if one of those is actually what's happening?
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: Switeck on June 09, 2019, 04:10:03 am
With so few torrents, disable torrent queueing (that's how it's misspelled in qBT!) and manually start+stop torrents as desired.

Uploading too quickly can cause massive packet loss and when that happens download speeds can suffer immensely.
An upload speed limit that takes into account overheads and changing conditions may mostly or completely prevent that.

Also, with really bad networking hardware/software, busy torrents could cause slowdowns or crashes.
Motherboard drivers for NIC cards even can be a cause -- they can have a built-in software firewall that after some extended period of time goes into a "learning mode" and starts considering BitTorrent traffic hostile and slow and blocking it...or just be buggy under heavy loads and require reboots to halfway restore them.

And lastly, many antivirus/antimalware products now have software firewalls...and they should've stuck with just rooting out malware instead of thinking they could do networking well too...because they suck at it!
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: mgillard1976 on June 10, 2019, 01:22:51 am
With so few torrents, disable torrent queueing (that's how it's misspelled in qBT!) and manually start+stop torrents as desired.

Uploading too quickly can cause massive packet loss and when that happens download speeds can suffer immensely.
An upload speed limit that takes into account overheads and changing conditions may mostly or completely prevent that.

Also, with really bad networking hardware/software, busy torrents could cause slowdowns or crashes.
Motherboard drivers for NIC cards even can be a cause -- they can have a built-in software firewall that after some extended period of time goes into a "learning mode" and starts considering BitTorrent traffic hostile and slow and blocking it...or just be buggy under heavy loads and require reboots to halfway restore them.

And lastly, many antivirus/antimalware products now have software firewalls...and they should've stuck with just rooting out malware instead of thinking they could do networking well too...because they suck at it!

So I reined in my upload speed, turned off torrent queueing. I turned off my AV temporarily to check and the problem returned. I'm starting to think that it's the motherboard driver (killer something or other) that is causing the issue. I've downloaded a new driver that is supposed to be free of this component but I believe I still need to remove the "killer". I'll try the new driver and report back.


Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: Switeck on June 10, 2019, 09:54:30 am
Other posts elsewhere suggest it's garbage:

https://www.reddit.com/r/qBittorrent/comments/amycnb/download_speed_caps_at_10mibs_on_lan/
"Was able to find the reason for this.  It was the Killer Networking Service that was capping it.  Disabled it and now there are no more issues."

https://linustechtips.com/main/topic/828780-utorrent-and-ethernet-cable-speed/
"Okay guys problem solved. I clicked on "update download speed" on the Killer Network driver and my speeds are awesome now. 16mb/s which I have never achieved before with Wi-Fi!"

https://forum.tixati.com/support/2844/
"it wasn't Tixati's fault. I run a mainboard that uses a Killer Networking Ethernet chipset. It turns out there was a bug in the drivers that was causing severe memory bloat when lots of data was being pushed through the NIC"
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: mgillard1976 on June 11, 2019, 12:23:54 am
So I can't actually find a killer driver. It doesn't seem to be installed so I'm thinking that's not the issue. I may try using another client to make sure it's not related to QB.

I do have an orange upload arrow which I assume is a problem. I have the port forwarded correctly in my router because I've checked it using canyouseeme.org

Could that be related??
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: Switeck on June 11, 2019, 12:44:53 am
Yes, if the router is correctly forwarded then something on your computer is blocking qBitTorrent...and possibly only qBitTorrent!
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: mgillard1976 on June 11, 2019, 01:14:53 am
Is there a good way to track this down? Log files? Could it be the ISP?
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: Switeck on June 11, 2019, 04:51:55 am
You have to know what AV and firewall software is on your computer and test with them uninstalled.

Log files of qBT are only slightly helpful under best of circumstances for this, since the problem isn't qBT.

Possible, but if it worked before...and recently...doubtful.
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: mgillard1976 on June 12, 2019, 09:41:51 pm
I've turned off my AV and as far as I know there is no firewall installed. I'll keep posting back with progress. I might not be the only one with the problem.
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: Switeck on June 13, 2019, 02:58:30 am
Once the problem starts again, does starting a new torrent (like a known-to-be-crazy-fast Linux distro torrent) also immediately run slow?
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: mgillard1976 on June 14, 2019, 01:48:19 am
I've turned off the windows firewalls and the problem hasn't returned yet although I still have the orange upload arrow. If the problem returns I'll try the linux distro and report back.
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: mgillard1976 on June 18, 2019, 12:36:24 am
The download issue hasn't returned after turning off the windows firewalls. However I still an orange upload arrow. This is probably not related so if I can't find a solution on my own I'll post a new thread.
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: carsten on June 22, 2019, 11:05:11 am
I got the same issue. Turned off windows firewall, but no change. Starts downloading with like 400mb/sec and drops to 0 within a minute. Then click the play button again and again downloads and dies within a minute.

I recently had a windows update, and recently installed the update fro QB, so not sure whats going on. But for now, I can't use this at all.

And I got so much to share... 8)
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: Switeck on June 22, 2019, 03:33:07 pm
400 MB/sec?!
That's very likely to overload a computer's cpu and storage drives -- and when that happens, a massive stall is the least of what's likely to happen. :(
Even Serial ATA 3 Solid State Drives (SSDs) can only manage ~400 MB/sec due to SATA-3 limitations.

Try testing with a much slower max speed limit in qBitTorrent, like 100 MB/sec.
If it works, then maybe test faster speeds...or just stick with whatever seems to work for now.
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: fusk on June 30, 2019, 12:47:36 pm
400 MB/sec?!
That's very likely to overload a computer's cpu and storage drives -- and when that happens, a massive stall is the least of what's likely to happen. :(

He was probably trying to say 400 mbit, which certainly is more than enough to overload a mechanical drive very fast, and even an ssd.
Btw. which benchmark measurements for storage is it that torrent traffic loves, was it 16kb?
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: carsten on June 30, 2019, 02:41:11 pm
sorry about the confusion about mb's and such. kib/sec is what it says in QB, so I will use that to make sure we're talking about the same thing.

Even with the max download speed set to 100kib/sec this happens.

before:

(https://i.postimg.cc/0QGGZyM0/before.png)

when I click 'resume':

(https://i.postimg.cc/W4wtHF8z/after.png)

All of a sudden there are more live seeds, speed goes to 80-150Kib/sec. Then slows down and within a minute its back to 0.
Looks like it actually did download some of the torrent. But why will it not just continue to download?

I'm testing here with a well seeded torrent of chrome linux. Why is this behaving so differently.... Could this have anything to do with installed search plugins?
A year ago I downloaded Linux mint with like 600 seeds and just took a few min to arrive. Now I try that same torrent again and just get 11 inactive seeds and no download. Should I go back to the previous version?
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: Switeck on June 30, 2019, 04:25:51 pm
carsten -- going by your partial screenshots, it almost certainly looks like you have a queuing problem in qBitTorrent!
Try force starting torrents for immediate relief from this problem.

...Then look into whether qBT is set to auto-manage torrents and whether the queue's settings count slow downloads and slow uploads.
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: carsten on June 30, 2019, 06:20:22 pm
I did 'force resume' to most of the downloads and it all came to life again  ;D

Quote
look into whether qBT is set to auto-manage torrents and whether the queue's settings count slow downloads and slow uploads.
I checked the settings, but I don't recognize any of the settings as auto-managing.


config > bittorent at 'Torretn Queing' is enabled. 3-3-5
I don't know what that is, there is no mouseover tooltip info, so I think I left that set as default.
'do not count slow torrents in these limits' is unset.

Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: fusk on July 01, 2019, 12:02:11 am
Ahh, yeah that looks like a queue issue. Remember that if you have torrent 1, 2 & 3. A download max of 2, and don't count slow. If torrent 1 or 2 is either slow enough, or stops. Then torrent 3 will start downloading, but stop when 1 or 2 starts again. You can rightclick a torrent and change it's position in the queue up or down. Or force to ignore queue rules.
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: Switeck on July 01, 2019, 06:26:58 am
Under Options, Downloads, Saving Management, Default Torrent Management Mode... that's where it can be set to automatically muck with the torrent queue.
...And considering the problems you're having, it seems it has.
Title: Re: Download speed starts fine but after about 20-30 s drops to a few Bps.
Post by: carsten on July 01, 2019, 08:13:30 am
Quote
Under Options, Downloads, Saving Management, Default Torrent Management Mode... that's where it can be set to automatically muck with the torrent queue.
...And considering the problems you're having, it seems it has.
I have that set to manuel.

Quote
Ahh, yeah that looks like a queue issue. Remember that if you have torrent 1, 2 & 3. A download max of 2, and don't count slow. If torrent 1 or 2 is either slow enough, or stops. Then torrent 3 will start downloading, but stop when 1 or 2 starts again. You can rightclick a torrent and change it's position in the queue up or down. Or force to ignore queue rules.
I now disabled queing alltogether. I was trying to download 1 thing via 5 different torrents which seeders/peers hardly ever seemed online. I just want it to download whenever a seed/peer is available. I'm sure there is some reason why some people might like using queing, but in my case I don't think I should.

Anyway, all working just fine. Thanks for all the help!