[Bug 816035] Re: Memory upgrade makes Ubuntu painfully slow

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 3.0.0-7.9

---------------
linux (3.0.0-7.9) oneiric; urgency=low

  [ Andy Whitcroft ]

  * Revert "[Upstream] add local prefix to oss local change_bits"
  * Revert "SAUCE: add tracing for user initiated readahead requests"
  * Revert "SAUCE: vfs: Add a trace point in the mark_inode_dirty function"
  * Revert "SAUCE: Input: ALPS - Enable Intellimouse mode for Lenovo
    Zhaoyang E47"
  * Revert "SAUCE: fix documentation strings for struct input_keymap_entry"
  * Revert "SAUCE: vt -- fix handoff numbering to 1..n and add range checks
    (grub)"
  * Revert "SAUCE: vt -- fix handoff numbering to 1..n and add range
    checks"
  * Revert "SAUCE: vt -- allow grub to request automatic vt_handoff"
  * Revert "SAUCE: vt -- maintain bootloader screen mode and content until
    vt switch"
  * [Config] enable CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
    - LP: #816035
  * ubuntu: Yama: if an underlying filesystem provides a permissions op use
    it
  * SAUCE: (no-up) add tracing for user initiated readahead requests
  * SAUCE: vt -- maintain bootloader screen mode and content until vt
    switch
  * SAUCE: vt -- allow grub to request automatic vt_handoff

  [ Arjan van de Ven ]

  * SAUCE: (no-up) vfs: Add a trace point in the mark_inode_dirty
function

  [ Kees Cook ]

  * Revert "SAUCE: (no-up) Disable building the ACPI debugfs source"
  * [Config] enforce ACPI_CUSTOM_METHOD disabled

  [ Keng-Yu Lin ]

  * SAUCE: (no-up) Input: ALPS - Enable Intellimouse mode for Lenovo
    Zhaoyang E47
    - LP: #632884, #803005

  [ Leann Ogasawara ]

  * [Config] Enable CONFIG_BLK_DEV_CMD64X=m on powerpc
    - LP: #513131
  * [Config] Enable CONFIG_RT2800PCI_RT53XX=y
    - LP: #815064

  [ Rezwanul Kabir ]

  * SAUCE: (no-up) Add support for Intellimouse Mode in ALPS touchpad on
    Dell E2 series Laptops
    - LP: #632884

  [ Upstream Kernel Changes ]

  * Revert "yama: if an underlying filesystem provides a permissions op use
    it"
  * Revert "Add support for Intellimouse Mode in ALPS touchpad on Dell E2
    series Laptops"
  * Revert "tty: include linux/slab.h for kfree"
  * Revert "gpio/ml_ioh_gpio: include linux/slab.h for kfree"
  * Revert "pch_dma: add include/slab.h for kfree"
  * mmc: Added quirks for Ricoh 1180:e823 lower base clock frequency
    - LP: #773524
  * oss: rename local change_bits to avoid powerpc bitsops.h definition
 -- Leann Ogasawara <leann.ogasawara at canonical.com>   Mon, 25 Jul 2011 09:08:01 -0700

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

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https://bugs.launchpad.net/bugs/816035

Title:
  Memory upgrade makes Ubuntu painfully slow

Status in NULL Project:
  Invalid
Status in “grub2” package in Ubuntu:
  New
Status in “linux” package in Ubuntu:
  Fix Released
Status in “grub2” source package in Oneiric:
  New
Status in “linux” source package in Oneiric:
  Fix Released

Bug description:
  When upgrading the system memory of an Acer Veriton 1000 from 1GB to
  2GB, the Ubuntu 11.04 operating system becomes unusable slow. The
  problem is reproducible and only occurrs when both memory modules are
  inserted (operation in dual-channel mode). When booting from the live
  CD the problem does not occur, only when booting the operating system
  from hard disk after installation. When booting from the live CD, the
  hard drive can also be mounted and accessed with normal performance.

   The following diagnostic steps have already been performed:

  - upgraded system BIOS to latest version available
  - tried different memory modules (same outcome)
  - run memtest86 (all memory ok)
  - run ubuntu and other Linux from live CD (works ok)
  - installed Windows XP on hard drive (boots and runs with normal performance)
  - installed Fedora Linux 15 on hard drive (boots and runs with normal performance)

  More information:
  - Performance is already very slow at the Ubuntu Grub Bootloader Menu (before OS kernel is loaded): takes about 20 seconds to draw the main screen, 20 more seconds to draw the edit screen when using "e" button on a grub list element
  - Besides the very poor performance no errors are shown; OS can also be booted in about 10mins (instead of 30 seconds when only one mem module is inserted)
  - When OS is booted, bottleneck seems to be disk I/O, but hard disk activity is only very low; no kernel / system errors visible, system responsiveness also ok as long as no disk access happens.

  I suspect Ubuntu to apply some special settings already at GRUB
  bootloader level when installing to a hard drive, or access memory in
  a special way. These "settings" seem not to be compatible with the
  systems dual channel memory access mode.

  Please inform me when any additional information is required, I'll be
  glad to provide.

  Kind regards,
  H.

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