Bianco Veigel, 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-rc6 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: latest-bios-2.30 needs-upstream-testing regression- release ** 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/997695 Title: severe performance issue using mdadm raid5 on top of LUKS Status in “cryptsetup” package in Ubuntu: Invalid Status in “linux” package in Ubuntu: Incomplete Bug description: I've upgraded to 12.04 a few days ago and since this, the performance of my crypto-drive is limited by CPU. I'm running an MDADM RAID5 on top of 7 independendtly encrypted drives (Seagate Barracuda XT 7200.12 2TB each encrypted using crypsetup / LUKS). The problem seems to be, that in 12.04 all encryption is done using only a single CPU core. In 10.04 each crypt-device used its own thread (kcrypt), that was the reason to encrypt each device independently and build a raid on top of the crypto devices. I'll attach a screenshot of munins iostat and CPU graph to illustrate the difference before and after the upgrade --- AlsaDevices: total 0 crw-rw---T 1 root audio 116, 1 Mai 1 15:52 seq crw-rw---T 1 root audio 116, 33 Mai 1 15:52 timer AplayDevices: aplay: device_list:252: no soundcards found... ApportVersion: 2.0.1-0ubuntu7 Architecture: amd64 ArecordDevices: arecord: device_list:252: no soundcards found... AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. DistroRelease: Ubuntu 12.04 HibernationDevice: RESUME= IwConfig: lo no wireless extensions. virbr0 no wireless extensions. eth0 no wireless extensions. Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 002: ID 051d:0002 American Power Conversion Uninterruptible Power Supply MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. Package: linux (not installed) ProcEnviron: LANGUAGE=de_DE:de:en_US:en TERM=xterm LANG=de_DE.UTF-8 SHELL=/bin/bash ProcFB: 0 nouveaufb ProcKernelCmdLine: root=/dev/mapper/md1_crypt ro quiet splash ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14 RelatedPackageVersions: linux-restricted-modules-3.2.0-24-generic N/A linux-backports-modules-3.2.0-24-generic N/A linux-firmware 1.79 RfKill: Error: [Errno 2] No such file or directory StagingDrivers: cxd2099 Tags: precise staging Uname: Linux 3.2.0-24-generic x86_64 UpgradeStatus: Upgraded to precise on 2012-04-30 (10 days ago) UserGroups: mythtv dmi.bios.date: 04/30/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P2.30 dmi.board.name: K10N78FullHD-hSLI.. dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.30:bd04/30/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnK10N78FullHD-hSLI..:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. 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