elatllat, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com /daily-live/current/ .
If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report: apport-collect -p linux <replace-with-bug-number> Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags: kernel-fixed-upstream kernel-fixed-upstream-VERSION-NUMBER where VERSION-NUMBER is the version number of the kernel you tested. For example: kernel-fixed-upstream-v3.11-rc5 This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag: needs-upstream-testing If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER As well, please remove the tag: needs-upstream-testing Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** Tags added: bios-outdated-a04 needs-upstream-testing ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/875733 Title: disk cache is slow on average with dm-crypt Status in “linux” package in Ubuntu: Incomplete Bug description: I would expect the cached read speeds to be the same as the cache is above the encryption device mapper layer. Using dm-crypt read speeds are inconsistent averaging 380 MB/s, not using dm-crypt read speeds are consistently 1200 MB/s. I used dd to test at least 12 times: dd if=./test.file of=/dev/null bs=1M count=1024 lsb_release -rd: Description: Ubuntu 10.04.3 LTS Release: 10.04 apt-cache policy cryptsetup: cryptsetup: Installed: 2:1.1.0~rc2-1ubuntu13 Candidate: 2:1.1.0~rc2-1ubuntu13 Version table: *** 2:1.1.0~rc2-1ubuntu13 0 500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages 100 /var/lib/dpkg/status --- AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21. AplayDevices: Error: [Errno 2] No such file or directory Architecture: i386 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D2', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Error: [Errno 2] No such file or directory Card0.Amixer.values: Error: [Errno 2] No such file or directory DistroRelease: Ubuntu 10.04 HibernationDevice: RESUME=UUID=bedd48c0-3471-4c24-931d-ce224b3f746c MachineType: Dell Inc. Dell DV051 Package: linux (not installed) ProcCmdLine: root=UUID=bae54c1d-5f65-4a70-bff5-e9200e4ab461 ro quiet splash ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 2.6.32-33.72-generic-pae 2.6.32.41+drm33.18 Regression: No RelatedPackageVersions: linux-firmware 1.34.7 Reproducible: Yes RfKill: Tags: lucid filesystem needs-upstream-testing Uname: Linux 2.6.32-33-generic-pae i686 UserGroups: WifiSyslog: dmi.bios.date: 10/08/2005 dmi.bios.vendor: Dell Inc. dmi.bios.version: A03 dmi.board.name: 0JC474 dmi.board.vendor: Dell Inc. dmi.chassis.type: 6 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA03:bd10/08/2005:svnDellInc.:pnDellDV051:pvr:rvnDellInc.:rn0JC474:rvr:cvnDellInc.:ct6:cvr: dmi.product.name: Dell DV051 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/875733/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp