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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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