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91
Generic / Sawtooth shaped download speed.
« Last post by ghostBell on April 14, 2019, 10:41:44 PM »
Hi ! I'm a newcomer, may be my question is quite naive ...
My download speed looks like a "sawtooth signal", over a six hours period, as the attached image shows.
Is it a sign of misconfiguration or an intrinsic feature of normal data traffic ?


92
Windows / Re: All torrents "STALLED"
« Last post by bonefly on April 14, 2019, 04:15:24 PM »
Still looking for solutions here. I'm no pro so if you can give me a detailed "how to" hrlp please.
93
Windows / Re: Sequential downloading question
« Last post by Switeck on April 14, 2019, 03:42:42 PM »
94
Generic / Re: Connections limits
« Last post by Robertomcat on April 14, 2019, 02:04:42 PM »
Before I reinstalled, I always had a few active torrents seeding up using my shitty upload speed. But I forgot my settings and now it seems hard to get a few going for my ratio.
Let me know if I should change anything else. I made the other changes under advanced so that's done.
The problem may well be simply a lack of connected peers on torrents. Settings changes in qBT likely cannot fix that.

Other stuff I recommend disabling...
UPnP/NAT-PMP under Connection (it's above your global max connection settings).
Local Peer Discovery under BitTorrent (it tries to find Peers/Seeds on the same LAN as you using broadcast/multicast packets that can really hose networking)
Torrent Queueing also under BitTorrent (so buggy it's sad...you'll need to manually start/stop torrents)

In qBT's advanced settings:
Resolve peer host names (DNS lookups can be brutal, especially on qBT startup)
Resolve peer countries (GeoIP)  (same reason, and also does a flag lookup)
Download tracker favicon (there was even a remote exploit in the wild for this one!)
uTP-TCP mixed mode algo. best set to Prefer TCP.
I strongly recommend using preallocate files to vastly reduce fragmented downloads and defragging HDDs can help the DL/UL speeds a little bit. SSDs see massive write amplification from downloading torrents using qBT, but seeding copied torrents from SSDs works great.
I understand that pre-assignment is not the solution for defragmenting files. It is best to use a temporary folder (if possible on another disk), and fragmentation is eliminated when Qbt moves the file from the temporary folder to the final destination folder.
Pre-assignment on HDDs works decently well with the latest versions of libtorrent. qBitTorrent v4.1.5 isn't using the latest -- it was released almost 5 months ago.
qBT's main problem with pre-allocating/pre-assignment on HDDs wasn't fragmentation -- the problem was it ZERO-filled every byte instead of fast allocating. Start a multi-GB torrent with pre-allocate enabled and other reads/writes of torrents nearly ground to a halt while qBT writes out a few billion bytes of 0's in a row.

Thanks, I've also taken note of the geo-ip resolution and the favicon, it was the only thing I did not have disabled. I only use private trackers, and I think it does not matter much.

As for the pre-assignment, I only see utility in the case that you have a disk almost full, and serve to warn you that there is no space, it is not a way to defragment
95
Generic / Re: Connections limits
« Last post by Switeck on April 14, 2019, 01:26:32 PM »
Before I reinstalled, I always had a few active torrents seeding up using my shitty upload speed. But I forgot my settings and now it seems hard to get a few going for my ratio.
Let me know if I should change anything else. I made the other changes under advanced so that's done.
The problem may well be simply a lack of connected peers on torrents. Settings changes in qBT likely cannot fix that.

Other stuff I recommend disabling...
UPnP/NAT-PMP under Connection (it's above your global max connection settings).
Local Peer Discovery under BitTorrent (it tries to find Peers/Seeds on the same LAN as you using broadcast/multicast packets that can really hose networking)
Torrent Queueing also under BitTorrent (so buggy it's sad...you'll need to manually start/stop torrents)

In qBT's advanced settings:
Resolve peer host names (DNS lookups can be brutal, especially on qBT startup)
Resolve peer countries (GeoIP)  (same reason, and also does a flag lookup)
Download tracker favicon (there was even a remote exploit in the wild for this one!)
uTP-TCP mixed mode algo. best set to Prefer TCP.
I strongly recommend using preallocate files to vastly reduce fragmented downloads and defragging HDDs can help the DL/UL speeds a little bit. SSDs see massive write amplification from downloading torrents using qBT, but seeding copied torrents from SSDs works great.
I understand that pre-assignment is not the solution for defragmenting files. It is best to use a temporary folder (if possible on another disk), and fragmentation is eliminated when Qbt moves the file from the temporary folder to the final destination folder.
Pre-assignment on HDDs works decently well with the latest versions of libtorrent. qBitTorrent v4.1.5 isn't using the latest -- it was released almost 5 months ago.
qBT's main problem with pre-allocating/pre-assignment on HDDs wasn't fragmentation -- the problem was it ZERO-filled every byte instead of fast allocating. Start a multi-GB torrent with pre-allocate enabled and other reads/writes of torrents nearly ground to a halt while qBT writes out a few billion bytes of 0's in a row.
96
Linux / Installation Port 8080 déjà utilisé
« Last post by aroullier on April 14, 2019, 10:01:15 AM »
Bonjour,

Lorsque j'installe Qbittorrent, j'obtient ce message

Code: [Select]
*** Information légale ***
qBittorrent is a file sharing program. When you run a torrent, its data will be                   made available to others by means of upload. Any content you share is your sole                   responsibility.

No further notices will be issued.

Appuyez sur la touche 'y' pour accepter et continuer…
y
"Web UI: Unable to bind to IP: *, port: 8080. Reason: L'adresse liée est déjà ut                  ilisée"

A quel endroit peut-on modifier le port par défault ?

Je suis sur une configuration Ubuntu serveur (donc sans interface graphique)

Merci
97
Generic / Re: Connections limits
« Last post by Robertomcat on April 13, 2019, 11:05:42 AM »
I strongly recommend using preallocate files to vastly reduce fragmented downloads and defragging HDDs can help the DL/UL speeds a little bit. SSDs see massive write amplification from downloading torrents using qBT, but seeding copied torrents from SSDs works great.

Hello good day!

I understand that pre-assignment is not the solution for defragmenting files. It is best to use a temporary folder (if possible on another disk), and fragmentation is eliminated when Qbt moves the file from the temporary folder to the final destination folder.
98
Generic / Re: Connections limits
« Last post by lokito50 on April 12, 2019, 10:22:05 PM »
A linear increase in settings from 10 mbits/sec UL to 15 mbits/sec UL would be a 50% increase, but many BitTorrent settings don't scale or only scale minimally.

Upload is still the limiting factor, although fortunately you probably meant 1200 KB/s not 1200 B/s.
So 1200 KiloBYTES/second upload max in qBitTorrent.

1200 KB/sec split into 10-20 KB/sec average speed upload slots would be 60-120 global max upload slots.
Even with each torrent using a bare minimum of 2 upload slots each and 120 global max upload slots, you'd still be limited to 60 max active torrents at once.
A much more reasonable number of active torrents at once would be closer to 10-30.

I don't really recommend using torrent queuing in qBT because it was pretty messed up and doesn't work correctly last I tried it. (but that's been awhile, like v3.1.0 or something ancient.)
But you can still limit your torrents by not starting too many at once unless you're certain that very few will have active peers and/or seeds on them.

You won't want a torrent or 2 "hogging" all the upload slots or connections, so set the max connections per torrent to maybe 1/10th global max connections and set max upload slots per torrent to no more than 50-80% max connections per torrent OR 1/10th global max upload slots (whichever is lower).
May want more connections per torrent while downloading, but probably not more than double the 1/10th global max connections.

In advanced settings, I recommend setting max half open connections to 10 or no higher than 20 at once.

A slow HDD is even less likely to keep up with the faster speed of your connection. I strongly recommend using preallocate files to vastly reduce fragmented downloads and defragging HDDs can help the DL/UL speeds a little bit. SSDs see massive write amplification from downloading torrents using qBT, but seeding copied torrents from SSDs works great.

Disk cache set to 1024MiB and the expiry interval set to 600s...because of qBT limits.
Thank you for reaching out again. I meant 1000-1200 KiB/s sorry. Here are my settings as I still get a little confused understanding each one. What do you think?

Global max number of connections         500
Max number of connections per torrent  50
Global max number of upload slots        120
Max number of upload slots per torrent  10



Before I reinstalled, I always had a few active torrents seeding up using my shitty upload speed. But I forgot my settings and now it seems hard to get a few going for my ratio.
Let me know if I should change anything else. I made the other changes under advanced so that's done.
Cheers,
99
Windows / Changing path of the category/subcategory and payload files relocation
« Last post by postcd on April 12, 2019, 07:24:38 PM »
I do not want anyone to waste time on answering this, but in case anyone knows, my question is:

Is it safe to modify some parent category (which contains subcategories) save path? Will be there any relocation of the torrent payload files in category subcategories? What if i have some manual (not "Automatic Torrent Management") mode torrents set to old category path (it is set when you right click some category) which i am changing to new one by modifying parent category? Child category "Save path" modification not a problem?
100
Windows / Re: Sequential downloading question
« Last post by rrrevin on April 12, 2019, 02:57:08 PM »
This is why I never enable sequential download.

And here is a great article why you should never use it : https://wiki.vuze.com/w/Sequential_downloading_is_bad

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