[Bug 1987019] Re: Large torrent downloads render the system near unresponsive

[shag00]

I saw that it was filed against do-release upgrade which is incorrect
but I could not find a way to correct that.

I disagree that it is a support issue, I have a new system, a recent OS
release and the problem is reproducible over several applications. The
same problem does not exist using another OS if that does not point at
the OS, as the hardware is the same, I can't imagine what would be more
definitive.

This problem has persisted for years over many versions of Ubuntu and
different PCs and always the work around has been to torrent large files
in Windows. The proof will be in attempting to do it.

I suspect it is disk related because of the problems in moving a
torrented file anywhere but it only applies to very large files, ~80GB+.
It is not a disk hardware issue as I have tried several disks. Because I
feel it is disk related does not mean the disk is the cause, it is not,
it even occurs with M2 SSDs.

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https://bugs.launchpad.net/bugs/1987019

Title:
  Large torrent downloads render the system near unresponsive

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  Kubuntu 22.04 (the same problem was in earlier versions)
  When downloading any large torrent (80-100 GB) the system becomes near unresponsive at some point during the download. By near unresponsive I mean that clicking on the torrent client window or another window that requires disk access (example, KDE Kate) may take a minute or more to gain focus, any attempt to issue a command eg. save file takes a similar amount of time. Concurrently the download speed drops markedly (from say 10 MB/s to less than 1 MB/s, often much lower).

  If the torrent client is closed and any attempt to copy/move the file
  it created is painfully slow, instead of transferring the file
  (internal HDD to internal HDD) at roughly 120MB/s the speed is reduced
  to a couple of hundred KB/s with multi MB bursts on occasion. In total
  it takes 5-6 hours to copy a 70GB file from one disk to another.

  I have tested a number of torrent clients and they all suffer the same
  problem and I have repeated the tests using the same clients (tixati,
  qbittorrent, <Ktorrent>) and the same download target on the same PC
  on Windows which have no problems, I can download the files at 10MB/s
  and transfer the files to another disk as per normal.

  As it appears this is a disk related problem I have replaced the disk
  and Gsmartcontrol reports no issues of concern.

  Please note that downloading smaller files do not display this
  problem, downloading a 20-30GB file shows no problems. In the
  beginning large files also display no problems but at some point the
  system slows down, I cannot pinpoint an exact size or percentage when
  the problem starts.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: ubuntu-release-upgrader-core 1:22.04.13
  ProcVersionSignature: Ubuntu 5.15.0-46.49-generic 5.15.39
  Uname: Linux 5.15.0-46-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu82.1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Fri Aug 19 10:16:23 2022
  InstallationDate: Installed on 2022-05-06 (104 days ago)
  InstallationMedia: Kubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)

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