Public bug reported: 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 ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug natty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/797075 Title: btrfs with discard option has terrible performance To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/797075/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
