this post was submitted on 25 Jan 2025
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Jellyfin Buffering Slow Torrents (lemmy.ml)
submitted 1 week ago by monty33@lemmy.ml to c/selfhosted@lemmy.world
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I have been having a few issues recently, and I can't quite figure out what is causing this. My setup:

  • gigabit WAN up and down. Run speed tests regularly and get 800+ mbps up and down.
  • opnsense router VM (proxmox) running on a lenovo m920x. Installed an intel 2x10gbe card.
  • Sodola 10gbe switch
  • TrueNAS server (bare metal) w/ 10gbe serving the media files over NFS, stored on a ZFS mirror.
  • Jellyfin LXC
  • debian LXC running the arr stack w/ qbittorrent
  • NVidia Shield w/ ethernet

First issue is extremely slow downloads on qbittorrent. Even if I download an ubuntu iso with hundreds of seeders will sit around 1 mibps. Media downloads with ~10 seeders, I'll sit around 200kibps. Running this through gluetun and protonvpn wireguard with port forwarding enabled and functioning.

Second issue I'm having is if I am downloading anything on qbittorrent, and attempt to play a 4k remux on Jellyfin, it is constantly buffering. If I stop all downloads, immediately the movie plays without issue. 1080 files play without issue all the time.

I tried spinning up a new LXC with qbittorrent, and can download ubuntu isos at 30+ mibps locally and not over NFS.

Any idea what could be causing this? Is this a read/write issue on my TrueNAS server? Networking issuing causing the NFS to be slow? I've run iperf to the TrueNAS and getting 9+gbps.

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[–] monty33@lemmy.ml 1 points 1 week ago (1 children)

One other thing I changed recently is the motherboard on the NAS. The new one is DDR5 and I didnt have another machine that takes ddr5 to run the new ram through men test, and I didnt want any downtime so I didnt do it. I just powered down the NAS and started memtest. Do you think a bad stick of ram could be the culprit? At this point in just trying to rule things out

[–] just_another_person@lemmy.world 1 points 1 week ago (2 children)

Bad RAM wouldn't present like this. You'd more than likely never get past boot with a DDR5 board having caught it with POST tests, or you'd have thrown a kernel exception by now.

I saw you mentioned that a new LXC container didn't have the traffic problem, so this is definitely something with config somehow.

[–] monty33@lemmy.ml 1 points 1 week ago (1 children)

OK so I have done some additional testing:

  • Memtest passed
  • Added the NFS share to the new qbittorrent LXC, and the download speed dropped down to where my primary qbt is. So I believe this means it is related to the NFS share.
  • Connected the NAS to a different switch. No change.
  • Tried connecting to the NFS share through a different NIC in TrueNAS. No change.
  • Migrated the qbt lxc to another proxmox node. No change.
  • Created a new NFS share on a different pool on TrueNAS and made that the download directory for qbt. No change.

So I believe I have ruled out memory issues, NIC issues, datapool issues, and switch issues.

The problem is I don't know exactly when this started.

I did change out the motherboard on TrueNAS, and just installed the existing NVMe drives into the new motherboard and booted off of them. I did not install a new TrueNAS OS and restore a backup. Could this be an issue?

Shortly after the motherboard change, I upgraded to Electric Eel.

[–] just_another_person@lemmy.world 1 points 1 week ago (1 children)

Try a test download without NFS and see what happens.

[–] monty33@lemmy.ml 1 points 1 week ago (1 children)

I tested that and I get full speeds. Upwards of 40-60mbps compared with the 1mbps I get when downloading to the NFS share

[–] just_another_person@lemmy.world 1 points 1 week ago (1 children)

Problem solved then. You know where the bottleneck is.

[–] monty33@lemmy.ml 1 points 1 week ago (1 children)

Yes I'm pretty sure I've got it narrowed down to issues with NFS shares from TrueNAS. What I can't figure out is how to fix it. I may do a backup, reinstall truenas, import backup, and see of that fixes it. I'm thinking potentially its an issue from reusing my old installation with the new motherboard, processor, and corresponding hardware.

[–] just_another_person@lemmy.world 1 points 1 week ago

Just don't use NFS for large files. It's not good for that.

[–] monty33@lemmy.ml 1 points 1 week ago

Good points. I will finish the memtest thats running if only to have something ruled out. After it finishes I will try attaching the NFS share to the new qbt lxc and see if i get the same slow download speeds.