apport information

** Attachment added: "IwConfig.txt"
   
https://bugs.launchpad.net/bugs/1790181/+attachment/5183060/+files/IwConfig.txt

-- 
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/1790181

Title:
  /proc/diskstats shows weird values

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  For one block device on one of my servers munin shows abnormally high
  latency.

  When querying /proc/diskstats manually, the device in question shows:
     8      32 sdc 973668 361965 64248290 10224376 755130 518162 22349256 
1347171224 63 54302956 1357481880

  
  Sanity check:
  If I divide the 7th value by the 4th value I get a avg read latency of about 
10.5 ms. That is somewhat in line with the Avg. Read IO Wait Time of 11.35 ms 
that munin reports.

  The problem:
  If I divide the 11th value by the 8th value I get an avg write latency of 
1789 ms. That is also close to the Avg. Write IO Wait Time of 1.60 s reported 
by munin. Now this is an SD card and it is slow, but not THAT slow..

  
  To confirm unexpected values, I measured some activity:

  
      $ dd if=/dev/urandom of=testfile bs=1M count=100; time sync;
      cat /proc/diskstats
      100+0 records in
      100+0 records out
      104857600 bytes (105 MB, 100 MiB) copied, 18,7652 s, 5,6 MB/s
      
      real      0m8,132s
      user      0m0,000s
      sys       0m0,007s

  The reported time spent writing went from 1353896856 before the test to 
1356759112 after the test.
  The difference is 2862256 ms or about 2800 seconds that supposedly passed in 
just over 26 real time seconds.
  I repeated the test with count=1 and got 5780 ms IO write time reported in .7 
s realtime.

  
  #1297522 describes a similar error but I have no idea if the cause is related.


  System information:
  Description:  Ubuntu 18.04.1 LTS
  Release:      18.04

  Linux 4.15.0-30-generic #32-Ubuntu SMP Thu Jul 26 17:42:43 UTC 2018
  x86_64 x86_64 GNU/Linux

  /dev/sdc is a Dell dual SD card module in RAID 1 mode with two Lexar 8GB U3 
cards.
  The system is a Dell R530.
  --- 
  ProblemType: Bug
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Aug  11 22:30 seq
   crw-rw---- 1 root audio 116, 33 Aug  11 22:30 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=719079af-279c-46cd-9438-01086a2cb16e
  InstallationDate: Installed on 2016-03-29 (885 days ago)
  InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64 
(20150805)
  MachineType: Dell Inc. PowerEdge R530
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 mgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-30-generic 
root=UUID=9be44daa-0a66-486f-9fac-ff0814849ed3 ro crashkernel=384M-:128M 
crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M 
crashkernel=384M-2G:128M,2G-:256M crashkernel=384M-2G:128M,2G-:256M 
crashkernel=384M-2G:128M,2G-:256M crashkernel=384M-2G:128M,2G-:256M 
crashkernel=384M-2G:128M,2G-:256M
  ProcVersionSignature: Ubuntu 4.15.0-30.32-generic 4.15.18
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-30-generic N/A
   linux-backports-modules-4.15.0-30-generic  N/A
   linux-firmware                             1.173.1
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  Tags:  bionic
  Uname: Linux 4.15.0-30-generic x86_64
  UnreportableReason: This report is about a package that is not installed.
  UpgradeStatus: Upgraded to bionic on 2018-08-11 (19 days ago)
  UserGroups: adm cdrom dip libvirt libvirtd lpadmin plugdev sambashare sudo
  _MarkForUpload: False
  dmi.bios.date: 10/05/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.5.4
  dmi.board.name: 0HFG24
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.5.4:bd10/05/2015:svnDellInc.:pnPowerEdgeR530:pvr:rvnDellInc.:rn0HFG24:rvrA01:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R530
  dmi.sys.vendor: Dell Inc.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1790181/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to     : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

Reply via email to