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

[shag00]

Public bug reported:

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)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: disks

** Tags removed: amd64 apport-bug dist-upgrade jammy
** Tags added: disks

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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:
  New

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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