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[elatllat <875733@xxxxxxxxxxxxxxxxxx>]

Seems to be fixed in 13.10 daily (Sun 18 Aug 2013 20:58:40 EDT)
I get about 5.6 GB/s on both cache of both encrypted and normal disks

Fresh install in VertualBox.
sudo -i
cryptsetup -c aes-xts-plain -s 512 luksFormat /dev/sdb
cryptsetup luksOpen /dev/sdb crypttest
mkfs.ext4 /dev/mapper/crypttest 
mkdir /media/crypt
mount /dev/mapper/crypttest /media/crypt
dd if=/dev/urandom of=/media/crypt/test.dat bs=1M count=1024
cp /media/crypt/test.dat ~/test.dat
dd if=~/test.dat of=/dev/null bs=1M count=1024
dd if=~/test.dat of=/dev/null bs=1M count=1024
dd if=/media/crypt/test.dat of=/dev/null bs=1M count=1024
dd if=/media/crypt/test.dat of=/dev/null bs=1M count=1024


** Changed in: linux (Ubuntu)
       Status: Incomplete => Fix Released

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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:
  Fix Released

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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