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** Changed in: linux (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/797075

Title:
  btrfs with discard option has terrible performance

Status in linux package in Ubuntu:
  Invalid

Bug description:
  Enabling 'discard' for btrfs on an SSD results in a substantial
  performance degradation, possibly related to fsync().  This is very
  noticable when running 'apt-get upgrade', and the test suggested in
  the link below went from 12 seconds without discard to 45 seconds with
  discard enabled.

  http://lists-archives.org/linux-kernel/27396958-btrfs-and-apt-package-
  manager-in-ubuntu-discard-stalls.html

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: linux-image (not installed)
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ketil      1710 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xd4500000 irq 45'
     Mixer name : 'Intel Cantiga HDMI'
     Components : 'HDA:111d7605,103c3663,00100402 
HDA:80862802,80860101,00100000'
     Controls      : 18
     Simple ctrls  : 10
  Date: Tue Jun 14 09:20:35 2011
  HibernationDevice: RESUME=UUID=ad4c20c6-5224-457d-9cd8-868767fd928c
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: Hewlett-Packard HP Pavilion dm1 Notebook PC
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/zsh
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-8-generic 
root=UUID=2a634684-4d1a-4822-8950-c1446eb3585b ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-2.6.38-8-generic N/A
   linux-backports-modules-2.6.38-8-generic  N/A
   linux-firmware                            1.52
  SourcePackage: linux
  UpgradeStatus: Upgraded to natty on 2011-05-04 (40 days ago)
  dmi.bios.date: 09/03/2009
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.02
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 3663
  dmi.board.vendor: Quanta
  dmi.board.version: 49.0A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Quanta
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvrF.02:bd09/03/2009:svnHewlett-Packard:pnHPPaviliondm1NotebookPC:pvr0392100000201B00000320000:rvnQuanta:rn3663:rvr49.0A:cvnQuanta:ct10:cvrN/A:
  dmi.product.name: HP Pavilion dm1 Notebook PC
  dmi.product.version: 0392100000201B00000320000
  dmi.sys.vendor: Hewlett-Packard

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