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[Michisteiner <1290337@xxxxxxxxxxxxxxxxxx>]

@Christopher. Sorry, can't answer that question: i never run anything
earlier than quantal on this hardware. On the previous laptop (thinkpad
w500) where i run many earlier versions of ubuntu  (including quantal
for a few weeks) i did not notice that problem but then that laptop did
have only 8GB of RAM (compared to the 16GB of the w530) on this one and
as mentioned in problem description (and also as mentioned in bug
1107150) the problem seems to appear only as you get more allocated RAM.
E.g., after the initial test with 3.15-rc5 and the relative quick arise
of the problem, i booted with mem=15000M (resulting in 14362796 total
mem instead of 16xxxxxx) and so far i've seen the problem less and could
(at least temporarily) resolve it using the sysctl drop_caches hack
(something which did not work anymore for the previous run with all RAM
enabled)

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https://bugs.launchpad.net/bugs/1290337

Title:
  [Lenovo ThinkPad W530] I/O slow down

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Since at least 12.10, symptoms are that as time goes by I/O gets
  slower and slower (primarily if not even only writes rather than
  reads). It can be temporarily cured via /sbin/sysctl -w
  vm.drop_caches=2 and/or /sbin/sysctl -w vm.drop_caches=3 but the
  problem will re-appear again sooner rather than later. The problem
  seems also somewhat proportional on how much RAM is allocated. It does
  not seem to appear with less than 8GB (i.e., i saw it first when
  switching to a 16GB laptop/ThinkPad w530) and is considerably worse
  when allowing all memory compared to, e.g., by using only ~14GB using
  the mem=14000M  boot option.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-18-generic 3.11.0-18.32
  ProcVersionSignature: Ubuntu 3.11.0-18.32-generic 3.11.10.4
  Uname: Linux 3.11.0-18-generic i686
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  msteiner   4131 F.... pulseaudio
   /dev/snd/controlC0:  msteiner   4131 F.... pulseaudio
   /dev/snd/pcmC0D0p:   msteiner   4131 F...m pulseaudio
   /dev/snd/seq:        timidity   3237 F.... timidity
  CRDA:
   country IN:
    (2402 - 2482 @ 40), (N/A, 20)
    (5170 - 5250 @ 40), (N/A, 20)
    (5250 - 5330 @ 40), (N/A, 20), DFS
    (5735 - 5835 @ 40), (N/A, 20)
  Date: Mon Mar 10 17:47:12 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=4a17fffe-b487-4abf-9df8-1846a925cf4b
  MachineType: LENOVO 2449A35
  MarkForUpload: True
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-18-generic root=/dev/mapper/babbage2-root ro acpi_osi=Linux mem=14000M nox2apic rcutree.rcu_idle_gp_delay=1
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-18-generic N/A
   linux-backports-modules-3.11.0-18-generic  N/A
   linux-firmware                             1.116.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-10-25 (135 days ago)
  dmi.bios.date: 05/24/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G5ET93WW (2.53 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2449A35
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG5ET93WW(2.53):bd05/24/2013:svnLENOVO:pn2449A35:pvrThinkPadW530:rvnLENOVO:rn2449A35:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2449A35
  dmi.product.version: ThinkPad W530
  dmi.sys.vendor: LENOVO

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