kernel-packages team mailing list archive

[Ken Sharp <1421490@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

>From a cold boot (power off --> power on), this system doesn't always
detect the presence of Hyperthreading on the processor. Note: warm
reboot has very different problems so cannot be tested.

It *usually* does, but on occasion for no obvious reason the system
reports a single CPU (HT systems report two CPUs to increase
performance).

Despite all the articles claiming the opposite; this noticeably reduces
performance of the system, especially in multi-threaded applications
such as Google Chrome (in the case of Chrome the difference in response
is considerable!)

linux-lts-trusty is NOT an option as it is incompatible with my graphics
drivers (no longer supported).

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.11.0-26-generic 3.11.0-26.45~precise1
ProcVersionSignature: Ubuntu 3.11.0-26.45~precise1-generic 3.11.10.12
Uname: Linux 3.11.0-26-generic i686
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.11.0-26-generic.
ApportVersion: 2.0.1-0ubuntu17.8
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  ken        3021 F.... pulseaudio
 /dev/snd/pcmC0D0p:   ken        3021 F...m pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Card0.Amixer.info:
 Card hw:0 'ICH5'/'Intel ICH5 with AD1980 at irq 17'
   Mixer name	: 'Analog Devices AD1980'
   Components	: 'AC97a:41445370'
   Controls      : 40
   Simple ctrls  : 29
Date: Fri Feb 13 02:00:00 2015
HibernationDevice: RESUME=UUID=e4687e6f-fa60-4155-bdd5-a1b94870204a
IwConfig:
 lo        no wireless extensions.
 
 eth1      no wireless extensions.
MachineType: Dell Computer Corporation Dimension 8300
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-26-generic root=UUID=9c013c53-e232-4e09-8235-315a373bac88 ro zswap.enabled=1
RelatedPackageVersions:
 linux-restricted-modules-3.11.0-26-generic N/A
 linux-backports-modules-3.11.0-26-generic  N/A
 linux-firmware                             1.79.18
RfKill:
 
SourcePackage: linux-lts-saucy
UpgradeStatus: Upgraded to precise on 2014-12-07 (67 days ago)
dmi.bios.date: 09/27/2004
dmi.bios.vendor: Dell Computer Corporation
dmi.bios.version: A07
dmi.board.name: 0W2562
dmi.board.vendor: Dell Computer Corp.
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Computer Corporation
dmi.modalias: dmi:bvnDellComputerCorporation:bvrA07:bd09/27/2004:svnDellComputerCorporation:pnDimension8300:pvr:rvnDellComputerCorp.:rn0W2562:rvr:cvnDellComputerCorporation:ct6:cvr:
dmi.product.name: Dimension 8300
dmi.sys.vendor: Dell Computer Corporation

** Affects: linux-lts-saucy (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 performance precise qa-kernel-lts-testing

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-lts-saucy in Ubuntu.
https://bugs.launchpad.net/bugs/1421490

Title:
  Hyperthreading not always detected

Status in linux-lts-saucy package in Ubuntu:
  New

Bug description:
  From a cold boot (power off --> power on), this system doesn't always
  detect the presence of Hyperthreading on the processor. Note: warm
  reboot has very different problems so cannot be tested.

  It *usually* does, but on occasion for no obvious reason the system
  reports a single CPU (HT systems report two CPUs to increase
  performance).

  Despite all the articles claiming the opposite; this noticeably
  reduces performance of the system, especially in multi-threaded
  applications such as Google Chrome (in the case of Chrome the
  difference in response is considerable!)

  linux-lts-trusty is NOT an option as it is incompatible with my
  graphics drivers (no longer supported).

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.11.0-26-generic 3.11.0-26.45~precise1
  ProcVersionSignature: Ubuntu 3.11.0-26.45~precise1-generic 3.11.10.12
  Uname: Linux 3.11.0-26-generic i686
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.11.0-26-generic.
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ken        3021 F.... pulseaudio
   /dev/snd/pcmC0D0p:   ken        3021 F...m pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Card0.Amixer.info:
   Card hw:0 'ICH5'/'Intel ICH5 with AD1980 at irq 17'
     Mixer name	: 'Analog Devices AD1980'
     Components	: 'AC97a:41445370'
     Controls      : 40
     Simple ctrls  : 29
  Date: Fri Feb 13 02:00:00 2015
  HibernationDevice: RESUME=UUID=e4687e6f-fa60-4155-bdd5-a1b94870204a
  IwConfig:
   lo        no wireless extensions.
   
   eth1      no wireless extensions.
  MachineType: Dell Computer Corporation Dimension 8300
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-26-generic root=UUID=9c013c53-e232-4e09-8235-315a373bac88 ro zswap.enabled=1
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-26-generic N/A
   linux-backports-modules-3.11.0-26-generic  N/A
   linux-firmware                             1.79.18
  RfKill:
   
  SourcePackage: linux-lts-saucy
  UpgradeStatus: Upgraded to precise on 2014-12-07 (67 days ago)
  dmi.bios.date: 09/27/2004
  dmi.bios.vendor: Dell Computer Corporation
  dmi.bios.version: A07
  dmi.board.name: 0W2562
  dmi.board.vendor: Dell Computer Corp.
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Computer Corporation
  dmi.modalias: dmi:bvnDellComputerCorporation:bvrA07:bd09/27/2004:svnDellComputerCorporation:pnDimension8300:pvr:rvnDellComputerCorp.:rn0W2562:rvr:cvnDellComputerCorporation:ct6:cvr:
  dmi.product.name: Dimension 8300
  dmi.sys.vendor: Dell Computer Corporation

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