kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

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** Tags added: bios-outdated-a04 needs-upstream-testing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

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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.

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