kernel-packages team mailing list archive

[Jeff Lane <jeffrey.lane@xxxxxxxxxxxxx>]

Tried mainline too:
ubuntu@oil-phelps:~$ ./clocktest 
Testing for clock jitter on 8 cpus
PASSED: largest jitter seen was 0.000385

Testing clock direction for 5 minutes...
FAILED: Iteration 0 delta: 3.654284
FAILED: Iteration 1 delta: 1.010557
FAILED: Iteration 2 delta: 0.734235
FAILED: Iteration 3 delta: 0.200061
FAILED: Iteration 4 delta: 0.229663
clock direction test: sleeptime 60 sec per iteration, failed iterations: 5

I wonder, however, if this is not signs of a failing CPU?  cpuinfo says this is an Opteron 6320.  I tried it on another system with an Opteron 6172 and it worked fine:
ubuntu@bysen:~$ ./clocktest 
Testing for clock jitter on 24 cpus
PASSED: largest jitter seen was 0.001858

Testing clock direction for 5 minutes...
PASSED: Iteration 0 delta: 0.000109
PASSED: Iteration 1 delta: 0.000101
PASSED: Iteration 2 delta: 0.000100
PASSED: Iteration 3 delta: 0.000103
PASSED: Iteration 4 delta: 0.000101
clock direction test: sleeptime 60 sec per iteration, failed iterations: 0

Given that its limited to one system and regardless of kernel, I'm
betting it's an actual hardware issue.

-- 
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/1563970

Title:
  Clock issues on AMD Opteron(tm) Processor 6320

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  In doing certification testing on an HP DL385p Gen8 server with an AMD
  Opteron(tm) Processor 6320 CPU, we've run into some clock issues, as
  illustrated by the following:

  $ for x in `seq 0 9`; do start=`date +"%s"`; sleep 60; stop=`date +"%s"`; echo "$stop - $start"|bc; done
  65
  62
  60
  60
  60
  61
  60
  60
  60
  61

  This should produce a string of "60" values, and does on most systems;
  however, on the DL385p Gen8, the output shown above is quite
  irregular. (The test we use in the certification suite is more
  specialized and is not this exact test; the above is simply an easy-
  to-reproduce bash variant.)

  The system in question is "phelps" in OIL.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-15-generic 4.4.0-15.31
  ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
  Uname: Linux 4.4.0-15-generic x86_64
  AlsaDevices:
   total 0
   crw-rw----+ 1 root audio 116,  1 Mar 29 14:43 seq
   crw-rw----+ 1 root audio 116, 33 Mar 29 14:43 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: [Errno 2] No such file or directory: 'fuser'
  Date: Wed Mar 30 12:13:22 2016
  HibernationDevice: RESUME=UUID=b6a44b05-ebe0-4d1c-a525-69d4748960f8
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: HP ProLiant DL385p Gen8
  PciMultimedia:
   
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-15-generic root=UUID=96485ede-c1a8-407d-9960-f4cfa725ea89 ro rootdelay=60
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-15-generic N/A
   linux-backports-modules-4.4.0-15-generic  N/A
   linux-firmware                            1.157
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/06/2014
  dmi.bios.vendor: HP
  dmi.bios.version: A28
  dmi.chassis.type: 23
  dmi.chassis.vendor: HP
  dmi.modalias: dmi:bvnHP:bvrA28:bd02/06/2014:svnHP:pnProLiantDL385pGen8:pvr:cvnHP:ct23:cvr:
  dmi.product.name: ProLiant DL385p Gen8
  dmi.sys.vendor: HP

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1563970/+subscriptions