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[Bug 1306573] [NEW] The kernel seems to fail to cache disk blocks in some cases.

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Public bug reported:

I have a server with 16G RAM. When running Ubuntu 10.04, it would cache
my mail directory (with way too many messages: about 20000), and
starting mutt was quick unless the daily backup had been running.

After upgrading to 14.04, I now notice that I have to wait much more
often for the maildir to get cached.

I have a script called "cmd" for "cache-mail-dir".

I had run it just before this, so everything was still cached when I
started this:

abra2:~> time cmd ; time cmd; sleep 120 ; time cmd; time cmd
0.080u 0.084s 0:00.24 66.6%     0+0k 0+0io 0pf+0w
0.072u 0.088s 0:00.23 65.2%     0+0k 0+0io 0pf+0w
0.096u 0.128s 0:30.52 0.6%      0+0k 229768+0io 0pf+0w
0.088u 0.076s 0:00.27 55.5%     0+0k 0+0io 0pf+0w
abra2:~> 

The first two commands run in 0.25 seconds. Good. Then, wait for two
minutes, and everything needs to come from teh disk again, taking half a
minute.  Run the command again, and you're back to 0.25 seconds....

The server claims to have 13G of memory "free", and this is still the
case after weeks of uptime.

The "reporting guidelines" tell me to run "ubuntu-bug linux" for kernel
bugs, which then tells me that "linux is not an ubuntu package".

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-23-generic 3.13.0-23.45
ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
Uname: Linux 3.13.0-19-generic i686
ApportVersion: 2.14.1-0ubuntu2
Architecture: i386
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D2c', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Fri Apr 11 13:46:03 2014
HibernationDevice: RESUME=UUID=4aa126df-bbdf-4fd1-a333-9249ebffd271
InstallationDate: Installed on 2012-01-19 (812 days ago)
InstallationMedia: Ubuntu 10.04.3 LTS "Lucid Lynx" - Release i386 (20110720.1)
MachineType: System manufacturer System Product Name
ProcFB:
 
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-19-generic root=UUID=065abdd3-9e4d-4c45-a924-28b42317d6aa ro recovery nomodeset
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-19-generic N/A
 linux-backports-modules-3.13.0-19-generic  N/A
 linux-firmware                             1.127
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-03-27 (15 days ago)
dmi.bios.date: 01/24/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0304
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: H61M-A/USB3
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0304:bd01/24/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH61M-A/USB3:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: apport-bug i386 trusty

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1306573

Title:
  The kernel seems to fail to cache disk blocks in some cases.

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I have a server with 16G RAM. When running Ubuntu 10.04, it would
  cache my mail directory (with way too many messages: about 20000), and
  starting mutt was quick unless the daily backup had been running.

  After upgrading to 14.04, I now notice that I have to wait much more
  often for the maildir to get cached.

  I have a script called "cmd" for "cache-mail-dir".

  I had run it just before this, so everything was still cached when I
  started this:

  abra2:~> time cmd ; time cmd; sleep 120 ; time cmd; time cmd
  0.080u 0.084s 0:00.24 66.6%     0+0k 0+0io 0pf+0w
  0.072u 0.088s 0:00.23 65.2%     0+0k 0+0io 0pf+0w
  0.096u 0.128s 0:30.52 0.6%      0+0k 229768+0io 0pf+0w
  0.088u 0.076s 0:00.27 55.5%     0+0k 0+0io 0pf+0w
  abra2:~> 

  The first two commands run in 0.25 seconds. Good. Then, wait for two
  minutes, and everything needs to come from teh disk again, taking half
  a minute.  Run the command again, and you're back to 0.25 seconds....

  The server claims to have 13G of memory "free", and this is still the
  case after weeks of uptime.

  The "reporting guidelines" tell me to run "ubuntu-bug linux" for
  kernel bugs, which then tells me that "linux is not an ubuntu
  package".

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-23-generic 3.13.0-23.45
  ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
  Uname: Linux 3.13.0-19-generic i686
  ApportVersion: 2.14.1-0ubuntu2
  Architecture: i386
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D2c', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Fri Apr 11 13:46:03 2014
  HibernationDevice: RESUME=UUID=4aa126df-bbdf-4fd1-a333-9249ebffd271
  InstallationDate: Installed on 2012-01-19 (812 days ago)
  InstallationMedia: Ubuntu 10.04.3 LTS "Lucid Lynx" - Release i386 (20110720.1)
  MachineType: System manufacturer System Product Name
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-19-generic root=UUID=065abdd3-9e4d-4c45-a924-28b42317d6aa ro recovery nomodeset
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-19-generic N/A
   linux-backports-modules-3.13.0-19-generic  N/A
   linux-firmware                             1.127
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-03-27 (15 days ago)
  dmi.bios.date: 01/24/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0304
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H61M-A/USB3
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0304:bd01/24/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH61M-A/USB3:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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