apport information ** Tags added: apport-collected
** Description changed: On a fresh lucid install, an unmount of an empty tmpfs mount is quite slow: # mkdir -p /tmp/test; mount -t tmpfs nodev /tmp/test; time umount /tmp/test real 0m0.318s user 0m0.000s sys 0m0.020s If there is pending I/O on any other filesystem, it can be even slower: # dd if=/dev/zero of=/tmp/testfile bs=1024 count=1024 # mkdir -p /tmp/test; mount -t tmpfs nodev /tmp/test; time umount /tmp/test real 0m8.270s user 0m0.000s sys 0m0.010s This is a regression from previous versions, e.g. on hardy: # uname -r 2.6.24-19-generic # mkdir -p /tmp/test; mount -t tmpfs nodev /tmp/test; time umount /tmp/test real 0m0.001s user 0m0.000s sys 0m0.000s - The root cause is the workaround patch which fixed bug - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/543617. It syncs - all filesystems when umount is called, not just the involved filesystem, - and applies to unmount of non-ext4 FSs. I've verified that the problem - goes away with that patch reverted. + The root cause is the workaround patch which fixed bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/543617. It syncs all filesystems when umount is called, not just the involved filesystem, and applies to unmount of non-ext4 FSs. I've verified that the problem goes away with that patch reverted. + --- + AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21. + Architecture: amd64 + AudioDevicesInUse: + USER PID ACCESS COMMAND + /dev/snd/controlC0: ubuntu 2819 F.... pulseaudio + CRDA: Error: [Errno 2] No such file or directory + Card0.Amixer.info: + Card hw:0 'NVidia'/'HDA NVidia at 0xfe024000 irq 22' + Mixer name : 'Realtek ALC882' + Components : 'HDA:10ec0882,10eca201,00100101' + Controls : 39 + Simple ctrls : 21 + DistroRelease: Ubuntu 10.04 + IwConfig: + lo no wireless extensions. + + eth0 no wireless extensions. + LiveMediaBuild: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429) + Lsusb: + Bus 002 Device 007: ID 413c:2106 Dell Computer Corp. + Bus 002 Device 006: ID 413c:3200 Dell Computer Corp. Mouse + Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub + Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub + MachineType: Shuttle Inc SN27V10 + Package: linux (not installed) + ProcCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity + ProcEnviron: + PATH=(custom, no user) + LANG=en_US.UTF-8 + SHELL=/bin/bash + ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2 + Regression: Yes + RelatedPackageVersions: linux-firmware 1.34 + Reproducible: Yes + RfKill: + + Tags: lucid filesystem regression-release needs-upstream-testing + Uname: Linux 2.6.32-21-generic x86_64 + UserGroups: + + dmi.bios.date: 06/27/2007 + dmi.bios.vendor: Phoenix Technologies, LTD + dmi.bios.version: 6.00 PG + dmi.board.name: FN27V10 + dmi.board.vendor: Shuttle Inc + dmi.chassis.type: 3 + dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd06/27/2007:svnShuttleInc:pnSN27V10:pvr:rvnShuttleInc:rnFN27V10:rvr:cvn:ct3:cvr: + dmi.product.name: SN27V10 + dmi.sys.vendor: Shuttle Inc ** Attachment added: "AlsaDevices.txt" http://launchpadlibrarian.net/49091807/AlsaDevices.txt -- tmpfs umount slowdown https://bugs.launchpad.net/bugs/585092 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
