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[Michisteiner <1290337@xxxxxxxxxxxxxxxxxx>]

@Joseph, thanks for the info and i could install v3.14-rc7-trusty
(although i had to switch from nvidia to integrated graphics as nvidia
didn't seem to work anymore).

The experience is somewhat mixed so far. In the half-day i'm running it
i haven't seen really bad behaviour (no multi-minute apt-get updates)
but machine still feels more sluggish than it seems to be when running
with old kernel and reduced memory.

And there certainly seems to be still some anomalies: After booting,
logging in X and letting the machine's I/O system settle down to idle
(according to htop and iotop) i run repeatedly the following command on
the otherwise idle machine:

   dd if=/dev/zero of=/tmp/disk-test bs=1M count=1k

As you can see ...

   1073741824 bytes (1.1 GB) copied, 13.5484 s, 79.3 MB/s
   1073741824 bytes (1.1 GB) copied, 14.7879 s, 72.6 MB/s
   1073741824 bytes (1.1 GB) copied, 16.2955 s, 65.9 MB/s
   1073741824 bytes (1.1 GB) copied, 17.5495 s, 61.2 MB/s
   1073741824 bytes (1.1 GB) copied, 19.267 s, 55.7 MB/s
   1073741824 bytes (1.1 GB) copied, 18.9594 s, 56.6 MB/s
   1073741824 bytes (1.1 GB) copied, 19.6092 s, 54.8 MB/s
   1073741824 bytes (1.1 GB) copied, 20.5099 s, 52.4 MB/s
   1073741824 bytes (1.1 GB) copied, 22.3197 s, 48.1 MB/s
   1073741824 bytes (1.1 GB) copied, 20.8351 s, 51.5 MB/s
   1073741824 bytes (1.1 GB) copied, 27.6185 s, 38.9 MB/s
   1073741824 bytes (1.1 GB) copied, 39.5405 s, 27.2 MB/s
   1073741824 bytes (1.1 GB) copied, 55.6986 s, 19.3 MB/s
   1073741824 bytes (1.1 GB) copied, 74.4439 s, 14.4 MB/s
   1073741824 bytes (1.1 GB) copied, 117.431 s, 9.1 MB/s
   1073741824 bytes (1.1 GB) copied, 142.33 s, 7.5 MB/s

... the performance got worse and worse. Looking at `iostat -zmx 3' I/O
utilization went down to less than 10% in the last iterations.

However, as soon as i run a single

  /sbin/sysctl -w vm.drop_caches=2

the dd went up again to 90 MB/s!!

So i would be tempted to add the 'kernel-bug-exists-upstream' tag.
Thoughts?

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

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

Status in “linux” package in Ubuntu:
  Confirmed

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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