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[Ilya Murav'jov <muravjov.il@xxxxxxxxx>]

I've located the bug more closely: after installing ubuntu-minimal for 13.04, i386 system from scratch and booting into it I found no issue with IO speed. (hurray!) 
Then I "apt-get install ubuntu-desktop" and the issue appeared again. After purge'ing and install'ing packages from 'ubuntu-desktop' - 'ubuntu-minimal' set I found the guilty: lightdm package.

So: 
- if I boot without starting lightgm service (GUI) then everything is ok (see the process list `ps aux` = 'good_ps.lst' file)
- then I start lightdm (initctl start lightdm) and that dd command is that slow (see the process list 'bad_ps_lightdm.lst')
- then I stop lightdm  (initctl stop lightdm) and that dd command is that slow still  (see the process list 'bad_ps_after_lightdm.lst'); killing userspace processes doesn't help either (only reboot helps).

Any ideas?

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https://bugs.launchpad.net/bugs/1264707

Title:
  IO limit 1.2 MB/s for 32bit ubuntu (after running lightdm service)

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I recently installed a new motherboard Asus M5A99FX PRO R2.0 and found out that IO speed is very low; i.e.  the dd command output:
  dd if=/dev/zero of=/tmp/output bs=8k count=1000k
  ^C13885+0 records in
  13885+0 records out
  113745920 bytes (114 MB) copied, 99.6639 s, 1.1 MB/s

  This issue is reproducing with my new SSD (with ext4), my USB drives
  and my hard disk (with ext4) from Ubuntu i386, 13.04 and 13.10. Such a
  speed is not ok, awfully slow. When I run two or more the same dd
  commands simultaneously,  I have 1,2 Mb/s for every process.

  WORKAROUND: Use the amd64 version.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic i686
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  ubuntu     4507 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu     4507 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     4507 F.... pulseaudio
  CasperVersion: 1.336ubuntu1
  Date: Sat Dec 28 15:56:33 2013
  IwConfig:
   lo        no wireless extensions.

   eth0      no wireless extensions.
  LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  RfKill:

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/10/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1708
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: M5A99FX PRO R2.0
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  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.:bvr1708:bd04/10/2013:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A99FXPROR2.0:rvrRev1.xx: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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